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Artykuły w czasopismach na temat „GHz-bursts”

Autor: Grafiati

Data publikacji: 12 października 2024

Data aktualizacji: 31 lipca 2025

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1

White, Stephen M., Masumi Shimojo, Kazumasa Iwai, et al. "Electron Cyclotron Maser Emission and the Brightest Solar Radio Bursts." Astrophysical Journal 969, no. 1 (2024): 3. http://dx.doi.org/10.3847/1538-4357/ad4640.

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Abstract This paper investigates the incidence of coherent emission in solar radio bursts, using a revised catalog of 3800 solar radio bursts observed by the Nobeyama Radio Polarimeters from 1988 to 2023. We focus on the 1.0 and 2.0 GHz data, where radio fluxes of order 1010 Jy have been observed. Previous work has suggested that these bursts are due to electron cyclotron maser (ECM) emission. In at least one well-studied case, the bright emission at 1 GHz consists of narrowband spikes of millisecond duration. Coherent emission at 1 GHz can be distinguished from traditional incoherent gyrosync

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2

Жданов, Дмитрий, Dmitriy Zhdanov, Сергей Лесовой, Sergey Lesovoi, Сусанна Тохчукова, and Susanna Tokhchukova. "Sources of type III solar microwave bursts." Solnechno-Zemnaya Fizika 2, no. 2 (2016): 12–21. http://dx.doi.org/10.12737/17341.

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Microwave fine structures allow us to study plasma evolution in an energy release region. The Siberian Solar Radio Telescope (SSRT) is a unique instrument designed to examine fine structures at 5.7 GHz. A complex analysis of data from RATAN-600, 4–8 GHz spectropolarimeter, and SSRT, simultaneously with extreme UV data, made it possible to localize sources of III type microwave drift bursts in August 10, 2011 event within the entire frequency band of burst occurrences, as well as to determine the most probable region of primary energy release. To localize sources of III type bursts from RATAN-6

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Жданов, Дмитрий, Dmitriy Zhdanov, Сергей Лесовой, Sergey Lesovoi, Сусанна Тохчукова, and Susanna Tokhchukova. "Sources of type III solar microwave bursts." Solar-Terrestrial Physics 2, no. 2 (2016): 15–27. http://dx.doi.org/10.12737/20996.

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Microwave fine structures allow us to study plasma evolution in an energy release region. The Siberian Solar Radio Telescope (SSRT) is a unique instrument designed to examine fine structures at 5.7 GHz. A complex analysis of data from RATAN-600, 4–8 GHz spectropolarimeter, and SSRT, simultaneously with EUV data, made it possible to localize sources of III type microwave bursts in August 10, 2011 event within the entire frequency band of burst occurrence, as well as to determine the most probable region of primary energy release. To localize sources of III type bursts from RATAN-600 data, an or

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4

Palliyaguru, Nipuni T., Devansh Agarwal, Golnoosh Golpayegani, et al. "A targeted search for repeating fast radio bursts associated with gamma-ray bursts." Monthly Notices of the Royal Astronomical Society 501, no. 1 (2020): 541–47. http://dx.doi.org/10.1093/mnras/staa3352.

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ABSTRACT The origin of fast radio bursts (FRBs) still remains a mystery, even with the increased number of discoveries in the last 3 yr. Growing evidence suggests that some FRBs may originate from magnetars. Large, single-dish telescopes such as Arecibo Observatory (AO) and Green Bank Telescope (GBT) have the sensitivity to detect FRB 121102-like bursts at gigaparsec distances. Here, we present searches using AO and GBT that aimed to find potential radio bursts at 11 sites of past gamma-ray bursts that show evidence for the birth of a magnetar. We also performed a search towards GW170817, whic

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5

Sawant, H. S., R. R. Rosa, J. R. Cecatto, and N. Gopalswamy. "Solar Simple Bursts Observed with High Spectral Resolution in the 18-23 GHz Range." International Astronomical Union Colloquium 142 (1994): 693–95. http://dx.doi.org/10.1017/s0252921100077976.

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AbstractFor the first time, solar bursts in the frequency range of (18-23) GHz have been observed with high-time (0.6-1.2 s) and high-frequency resolution (1 GHz), by using the Itapetinga 13.7m diameter antenna. Here, we investigate the microwave type “simple low level (< 10 SFU) bursts” associated with the impulsive phase of solar flares. Observed properties of these simple bursts are: rise time tr ~3 s, decay time td ~ 5 s and spectral index ranging between −1 and −4. These bursts were found to be associated with SF or SN flares as seen in Hα. The above properties suggest that they are li

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6

Kai, Keizo, Takeo Kosugi, and Nariaki Nitta. "Flux Relations between Hard X-Rays and Microwaves for Both Impulsive and Extended Solar Flares." Publications of the Astronomical Society of Japan 37, no. 1 (1985): 155–62. https://doi.org/10.1093/pasj/37.1.155.

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Abstract The correlation of peak fluxes between hard X-rays and microwaves from solar flares was reexamined separately for impulsive and extended bursts using 61 events recorded with both the hard X-ray spectrometer aboard the Hinotori satellite and the 17-GHz polarimeter at Nobeyama. (1) For impulsive bursts FR = 37.2 Fx0.77 with a small scatter of 0.3 orders of magnitude (rms), where FR is the 17-GHz peak flux in sfu and Fx is the hard X-ray peak flux integrated over 67–152 keV in photons s–1 cm–2. (2) Extended bursts deviate systematically above the regression line derived for impulsive bur

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7

Houben, L. J. M., L. G. Spitler, S. ter Veen, J. P. Rachen, H. Falcke, and M. Kramer. "Constraints on the low frequency spectrum of FRB 121102." Astronomy & Astrophysics 623 (March 2019): A42. http://dx.doi.org/10.1051/0004-6361/201833875.

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While repeating fast radio bursts (FRBs) remain scarce in number, they provide a unique opportunity for follow-up observations that enhance our knowledge of their sources and potentially of the FRB population as a whole. Attaining more burst spectra could lead to a better understanding of the origin of these bright, millisecond-duration radio pulses. We therefore performed ∼20 h of simultaneous observations on FRB 121102 with the Effelsberg 100 m radio telescope and the low frequency array (LOFAR) to constrain the spectral behaviour of bursts from FRB 121102 at 1.4 GHz and 150 MHz. This campai

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8

Kawabata, K., and H. Ogawa. "Solar Millimeter Wave Bursts." International Astronomical Union Colloquium 104, no. 2 (1989): 191–94. http://dx.doi.org/10.1017/s0252921100154132.

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9

Ye, Hanyu, Lilia Pontagnier, Abdelkrim Bendahmane, et al. "Programmable burst-mode laser system delivering picosecond pulses with continuously tunable 1 to 7 GHz pulse repetition rate and up to 1 kW average power." EPJ Web of Conferences 307 (2024): 02029. http://dx.doi.org/10.1051/epjconf/202430702029.

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We report on a laser producing bursts of GHz picosecond pulses with pulse repetition rate between 1 and 7.5 GHz, tens to thousands pulses per burst, 1 kW average power and inJ energy per burst. © 2024 The Author(s).

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10

Kosugi, Takeo. "Directivity of Radio Emission from Solar Flares." Publications of the Astronomical Society of Japan 37, no. 3 (1985): 575–89. https://doi.org/10.1093/pasj/37.3.575.

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Abstract The center-limb variation of the solar microwave burst intensity is investigated statistically with a sufficient number of events (~ 1000) at 17 GHz far above the mean turnover frequency of the microwave burst spectrum. The intensity of bursts (except that of GRF bursts) is independent of the disk longitude, which is slightly different from the results so far obtained below 10 GHz and also is in contradiction to the theoretical prediction by Takakura and Scalise (1970; AAA 3.077.005). Several possible models are proposed to explain why the gyrosynchrotron emission is apparently isotro

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11

Matsumoto, Hisashi, Zhibin Lin, Joel N. Schrauben, and Jan Kleinert. "Ultrafast laser ablation of silicon with ∼GHz bursts." Journal of Laser Applications 33, no. 3 (2021): 032010. http://dx.doi.org/10.2351/7.0000372.

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12

Kaufmann, P., F. M. Strauss, J. E. R. Costa, and E. Correia. "Circular polarization of solar bursts at 22 GHz." Solar Physics 148, no. 2 (1993): 341–58. http://dx.doi.org/10.1007/bf00645094.

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13

Lyu, Fen, En-Wei Liang, and D. Li. "Narrowly Banded Spectra with Peak Frequency around 1 GHz of FRB 20201124A: Implications for Energy Function and Radiation Physics." Astrophysical Journal 966, no. 1 (2024): 115. http://dx.doi.org/10.3847/1538-4357/ad3354.

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Abstract The radiation physics of fast radio bursts (FRBs) remains an open question. Current observations have discovered that narrowly banded bursts of FRB 20201124A are active in 0.4–2 GHz, and their spectral peak frequency ( ν p obs ) is mostly toward ∼1 GHz. Utilizing a sample of 1268 bursts of FRB 20201124A detected with the Five-hundred-meter Aperture Spherical radio Telescope (FAST), we show that the 1σ spectral regime of 71.4% of the events (in-band bursts) is within the FAST bandpass. The intrinsic burst energies ( E BWe obs ) and spectral widths ( σ s obs ) are well measured by fitti

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14

Caballero-Lucas, Francesc, Kotaro Obata, and Koji Sugioka. "Enhanced ablation efficiency for silicon by femtosecond laser microprocessing with GHz bursts in MHz bursts(BiBurst)." International Journal of Extreme Manufacturing 4, no. 1 (2022): 015103. http://dx.doi.org/10.1088/2631-7990/ac466e.

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Abstract Ultrashort laser pulses confine material processing to the laser-irradiated area by suppressing heat diffusion, resulting in precise ablation in diverse materials. However, challenges occur when high speed material removal and higher ablation efficiencies are required. Ultrafast burst mode laser ablation has been proposed as a successful method to overcome these limitations. Following this approach, we studied the influence of combining GHz bursts in MHz bursts, known as BiBurst mode, on ablation efficiency of silicon. BiBurst mode used in this study consists of multiple bursts happen

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15

Wan, Junlin, Jianfei Tang, Baolin Tan, Jinhua Shen, and Chengming Tan. "Statistical analysis of solar radio fiber bursts and relations with flares." Astronomy & Astrophysics 653 (September 2021): A38. http://dx.doi.org/10.1051/0004-6361/202140498.

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Fiber bursts are a type of fine structure that frequently occurs in solar flares. Although observations and theory of fiber bursts have been studied for decades, their microphysical process, emission mechanism, and especially the physical links with the flaring process still remain unclear. We performed a detailed statistical study of fiber bursts observed by the Chinese Solar Broadband Radio Spectrometers in Huairou with high spectral-temporal resolutions in the frequency ranges of 1.10−2.06 GHz and 2.60−3.80 GHz during 2000−2006. We identify more than 900 individual fiber bursts in 82 fiber

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16

Rosa, Reinaldo R., Mauricio J. A. Bolzan, Francisco C. R. Fernandes, H. S. Sawant, and Marian Karlický. "Nonlinear analysis of decimetric solar bursts." Proceedings of the International Astronomical Union 5, S264 (2009): 279–81. http://dx.doi.org/10.1017/s174392130999278x.

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AbstractThe solar radio emissions in the decimetric frequency range (above 1 GHz) are very rich in temporal and spectral fine structures due to nonlinear processes occurring in the magnetic structures on the corresponding active regions. In this paper we characterize the singularity spectrum, f(α), for solar bursts observed at 1.6, 2.0 and 3 GHz. We interpret our findings as evidence of inhomogeneous plasma turbulence driving the underlying plasma emission process and discuss the nonlinear multifractal approach into the context of geoeffective solar active regions.

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17

Kovalev, Y. Y., and G. M. Larionov. "A Jet Model Interpretation of Multi Frequency Flux Observations of Radio Outbursts in the AGN 0235+16." Symposium - International Astronomical Union 159 (1994): 397. http://dx.doi.org/10.1017/s0074180900175862.

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There are analyzed 1.5 - years observations of a series of bursts in the quasar 0235+16 at 8 frequencies between 0.3 GHz and 15 GHz from July 1981 to December 1982, obtained by Altschuler et al. (1984) and Aller et al. (1985). These observations are compared with a Hedgehog model (see Kovalev and Mikhailutsa, 1980, with full references).

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18

Faber, Jakob T., Vishal Gajjar, Andrew P. V. Siemion, et al. "Re-analysis of Breakthrough Listen Observations of FRB 121102: Polarization Properties of Eight New Spectrally Narrow Bursts." Research Notes of the AAS 5, no. 1 (2021): 17. http://dx.doi.org/10.3847/2515-5172/abde48.

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Abstract We report polarization properties for eight narrowband bursts from FRB 121102 that have been re-detected in a high-frequency (4–8 GHz) Breakthrough Listen observation with the Green Bank Telescope, originally taken on 2017 August 26. The bursts were found to exhibit nearly 100% linear polarization, Faraday rotation measures bordering 9.3 × 104 rad m−2, and stable polarization position angles, all of which agree with burst properties previously reported for FRB 121102 at the same epoch. We confirm that these detections are indeed physical bursts with limited spectral occupancies and fu

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19

Zhang, Yu, and Hui-Chun Wu. "Upper Field-strength Limit of Fast Radio Bursts." Astrophysical Journal 929, no. 2 (2022): 164. http://dx.doi.org/10.3847/1538-4357/ac5e2f.

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Abstract Fast radio bursts (FRBs) are cosmological radio transients with an unclear generation mechanism. Known characteristics such as their luminosity, duration, spectrum, and repetition rate, etc., suggest that FRBs are powerful coherent radio signals at GHz frequencies, but the status of FRBs near the source remains unknown. As an extreme astronomical event, FRBs should be accompanied by energy-comparable or even more powerful X/γ-ray counterparts. Here, particle-in-cell simulations of ultrastrong GHz radio pulse interaction with GeV photons show that at ≳3 × 1012 V cm−1 field strengths, q

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20

Zhang, Yu, and Hui-Chun Wu. "Upper Field-strength Limit of Fast Radio Bursts." Astrophysical Journal 929, no. 2 (2022): 164. http://dx.doi.org/10.3847/1538-4357/ac5e2f.

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Abstract Fast radio bursts (FRBs) are cosmological radio transients with an unclear generation mechanism. Known characteristics such as their luminosity, duration, spectrum, and repetition rate, etc., suggest that FRBs are powerful coherent radio signals at GHz frequencies, but the status of FRBs near the source remains unknown. As an extreme astronomical event, FRBs should be accompanied by energy-comparable or even more powerful X/γ-ray counterparts. Here, particle-in-cell simulations of ultrastrong GHz radio pulse interaction with GeV photons show that at ≳3 × 1012 V cm−1 field strengths, q

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21

Schwarz, Simon, Stefan Rung, Cemal Esen, and Ralf Hellmann. "Enhanced ablation efficiency using GHz bursts in micromachining fused silica." Optics Letters 46, no. 2 (2021): 282. http://dx.doi.org/10.1364/ol.415959.

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22

Qin, Zhihai, and Guangli Huang. "Some characteristics of pulsations in radio bursts at 9.375 GHz." Astrophysics and Space Science 218, no. 2 (1994): 213–22. http://dx.doi.org/10.1007/bf00627760.

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23

Gaidys, Mantas, Algirdas Selskis, Paulius Gečys, and Mindaugas Gedvilas. "High-rate stainless steel laser colouring with GHz femtosecond bursts." Optics & Laser Technology 188 (October 2025): 113014. https://doi.org/10.1016/j.optlastec.2025.113014.

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24

Laçin, M., P. Repgen, A. Maghsoudi, A. Şura, U. Aydemir, and F. Ö. Ilday. "50 GHz, 100 fs pulses at 100 W average power from a burst mode, all-single mode, Yb-doped fiber laser system." EPJ Web of Conferences 307 (2024): 02028. http://dx.doi.org/10.1051/epjconf/202430702028.

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We present a uniquely simple laser integrated in strictly single-mode fibers, producing bursts of 100- fs pulses at 50 GHz repetition rate at 100 W average power. This allows material processing with high efficiency and precision in the ablation-cooled regime.

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25

Kumar, P., R. M. Shannon, C. Flynn, et al. "Extremely band-limited repetition from a fast radio burst source." Monthly Notices of the Royal Astronomical Society 500, no. 2 (2020): 2525–31. http://dx.doi.org/10.1093/mnras/staa3436.

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ABSTRACT The fast radio burst (FRB) population is observationally divided into sources that have been observed to repeat and those that have not. There is tentative evidence that the bursts from repeating sources have different properties than the non-repeating ones. In order to determine the occurrence rate of repeating sources and characterize the nature of repeat emission, we have been conducting sensitive searches for repetitions from bursts detected with the Australian Square Kilometre Array Pathfinder (ASKAP) with the 64-m Parkes radio telescope, using the recently commissioned Ultra-wid

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26

Katz, J. I. "Fast radio bursts — A brief review: Some questions, fewer answers." Modern Physics Letters A 31, no. 14 (2016): 1630013. http://dx.doi.org/10.1142/s0217732316300135.

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Fast radio bursts (FRBs) are millisecond bursts of radio radiation at frequencies of about 1 GHz, recently discovered in pulsar surveys. They have not yet been definitively identified with any other astronomical object or phenomenon. The bursts are strongly dispersed, indicating passage through a high column density of low density plasma. The most economical interpretation is that this is the intergalactic medium, indicating that FRB are at “cosmological” distances with redshifts in the range 0.3–1.3. Their inferred brightness temperatures are as high as 10[Formula: see text] K, implying coher

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27

Krüger, A., B. Kliem, J. Hildebrandt, V. P. Nefedev, B. V. Agalakov, and G. Ya Smolkov. "An Attempt to Classify Solar Microwave-Bursts by Source Localization Characteristics and Dynamics of Flare-Energy Release." Symposium - International Astronomical Union 188 (1998): 205–6. http://dx.doi.org/10.1017/s0074180900114767.

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An overview of spatially resolved observations of solar radio bursts obtained by the Siberian Solar Radio Telescope at 5.8 GHz during the last ten years reveals the occurrence of different classes of burst emission defined by their source localization characteristics. Four major classes of bursts according to the source position relative to sunspots, the source size and structure, and the source height, could be tentatively distinguished and compared with burst spectral characteristics as well as with soft X-ray emission oberved by YOHKOH. These findings are in favour of a magnetic origin of t

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28

Farah, W., C. Flynn, M. Bailes, et al. "Five new real-time detections of fast radio bursts with UTMOST." Monthly Notices of the Royal Astronomical Society 488, no. 3 (2019): 2989–3002. http://dx.doi.org/10.1093/mnras/stz1748.

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Abstract We detail a new fast radio burst (FRB) survey with the Molonglo Radio Telescope, in which six FRBs were detected between 2017 June and 2018 December. By using a real-time FRB detection system, we captured raw voltages for five of the six events, which allowed for coherent dedispersion and very high time resolution (10.24 $\mu$s) studies of the bursts. Five of the FRBs show temporal broadening consistent with interstellar and/or intergalactic scattering, with scattering time-scales ranging from 0.16 to 29.1 ms. One burst, FRB181017, shows remarkable temporal structure, with three peaks

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29

Kumar, P., R. M. Shannon, M. E. Lower, et al. "Circularly polarized radio emission from the repeating fast radio burst source FRB 20201124A." Monthly Notices of the Royal Astronomical Society 512, no. 3 (2022): 3400–3413. http://dx.doi.org/10.1093/mnras/stac683.

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ABSTRACT The mechanism that produces fast radio burst (FRB) emission is poorly understood. Targeted monitoring of repeating FRB sources provides the opportunity to fully characterize the emission properties in a manner impossible with one-off bursts. Here, we report observations of the source of FRB 20201124A, with the Australian Square Kilometre Array Pathfinder (ASKAP) and the ultra-wideband low (UWL) receiver at the Parkes 64-m radio telescope (Murriyang). The source entered a period of emitting bright bursts during early 2021 April. We have detected 16 bursts from this source. One of the b

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Bartulevicius, Tadas, Karolis Madeikis, Laurynas Veselis, Virginija Petrauskiene, and Andrejus Michailovas. "Active fiber loop for synthesizing GHz bursts of equidistant ultrashort pulses." Optics Express 28, no. 9 (2020): 13059. http://dx.doi.org/10.1364/oe.389056.

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Bonamis, Guillaume, Eric Audouard, Clemens Hönninger, et al. "Systematic study of laser ablation with GHz bursts of femtosecond pulses." Optics Express 28, no. 19 (2020): 27702. http://dx.doi.org/10.1364/oe.400624.

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Jin, S. Z., R. Y. Zhao, and Q. J. Fu. "Solar microwave bursts recorded at 2.84 GHz with millisecond time resolution." Solar Physics 104, no. 2 (1986): 391–413. http://dx.doi.org/10.1007/bf00159090.

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Bouwhuis, Mieke, Keith W. Bannister, Jean-Pierre Macquart, et al. "A search for fast-radio-burst-like emission from Fermi gamma-ray bursts." Monthly Notices of the Royal Astronomical Society 497, no. 1 (2020): 125–29. http://dx.doi.org/10.1093/mnras/staa1889.

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ABSTRACT We report the results of the rapid follow-up observations of gamma-ray bursts (GRBs) detected by the Fermi satellite to search for associated fast radio bursts. The observations were conducted with the Australian Square Kilometre Array Pathfinder at frequencies from 1.2 to 1.4 GHz. A set of 20 bursts, of which four were short GRBs, were followed up with a typical latency of about 1 min, for a duration of up to 11 h after the burst. The data were searched using 4096 dispersion measure trials up to a maximum dispersion measure of 3763 pc cm−3, and for pulse widths w over a range of dura

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Lafargue, Manon, Théo Guilberteau, Pierre Balage, Bastien Gavory, John Lopez, and Inka Manek-Hönninger. "In-Volume Glass Modification Using a Femtosecond Laser: Comparison Between Repetitive Single-Pulse, MHz Burst, and GHz Burst Regimes." Materials 18, no. 1 (2024): 78. https://doi.org/10.3390/ma18010078.

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In this study, we report, for the first time, to the best of our knowledge, on in-volume glass modifications produced by GHz bursts of femtosecond pulses. We compare three distinct methods of energy deposition in glass, i.e., the single-pulse, MHz burst, and GHz burst regimes, and evaluate the resulting modifications. Specifically, we investigate in-volume modifications produced by each regime under varying parameters such as the pulse/burst energy, the scanning velocity, and the number of pulses in the burst, with the aim of establishing welding process windows for both sodalime and fused sil

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35

McIntyre, V. J., and W. J. Zealey. "Starbursts in Ring and Irregular Galaxies." Publications of the Astronomical Society of Australia 9, no. 2 (1991): 251–52. http://dx.doi.org/10.1017/s1323358000024012.

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AbstractThis paper presents the current status of a Ph.D. project undertaken to search for extended-scale bursts of star formation (> 1 kpc) in irregular and collisionally produced ring galaxies, principally in the southern half of the sky. Results of recent 8.4 GHz radio continuum observations and UBVRI CCD imaging of some of the program galaxies are presented.

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36

Zhang, Yong-Kun, Di Li, Bing Zhang, et al. "FAST Observations of FRB 20220912A: Burst Properties and Polarization Characteristics." Astrophysical Journal 955, no. 2 (2023): 142. http://dx.doi.org/10.3847/1538-4357/aced0b.

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Abstract We report the observations of FRB 20220912A using the Five-hundred-meter Aperture Spherical radio Telescope. We conducted 17 observations totaling 8.67 hr and detected a total of 1076 bursts with an event rate up to 390 hr−1. The cumulative energy distribution can be well described using a broken power-law function with the lower- and higher-energy slopes of −0.38 ± 0.02 and −2.07 ± 0.07, respectively. We also report the L-band (1–1.5 GHz) spectral index of the synthetic spectrum of FRB 20220912A bursts, which is −2.6 ± 0.21. The average rotation measure value of the bursts from FRB 2

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37

Metzner, Daniel, Markus Olbrich, Peter Lickschat, Alexander Horn, and Steffen Weißmantel. "X-ray generation by laser ablation using MHz to GHz pulse bursts." Journal of Laser Applications 33, no. 3 (2021): 032014. http://dx.doi.org/10.2351/7.0000403.

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38

Lopez, John, Samba Niane, Guillaume Bonamis, et al. "Percussion drilling in glasses and process dynamics with femtosecond laser GHz-bursts." Optics Express 30, no. 8 (2022): 12533. http://dx.doi.org/10.1364/oe.455553.

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Pyatunina, T. B. "Structure and Variability of Sources from Geodetic VLBI-Data." International Astronomical Union Colloquium 164 (1998): 157–58. http://dx.doi.org/10.1017/s0252921100044985.

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Abstract8 GHz maps of 39 radiosources have been obtained with ≈ 0.5 mas resolution from geodetic VLBI-data. Structure variability has been investigated on ≈ monthly interval during the bursts of radio emission of two sources 0059+581 and 0202+149 in period from June 1994 to February 1996. Bright jet components in the sources show no steady outward motion, but may be some oscillations near stationary positions.

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Kojima, Y., K. Fujisawa, and K. Motogi. "The bursting variability of 6.7 GHz methanol maser of G33.641-0.228." Proceedings of the International Astronomical Union 13, S336 (2017): 336–37. http://dx.doi.org/10.1017/s1743921317011395.

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AbstractFrom 2014 to 2015, we conducted a total of 469 days observation of the 6.7 GHz methanol maser in a star forming region G33.641-0.228, known to be a bursting maser source. As a result, eleven bursts were detected. On MJD 57364, the flux density grew by more than six times w.r.t the day before. Moreover, during the largest burst, the flux density repeatedly increased and decreased rapidly with time-scale as short as 0.24 day. Since these characteristics of the burst are similar to the solar burst, we speculate that the burst of the 6.7 GHz methanol maser in G33.641-0.228 might occur with

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Hilmarsson, G. H., L. G. Spitler, R. A. Main, and D. Z. Li. "Polarization properties of FRB 20201124A from detections with the Effelsberg 100-m radio telescope." Monthly Notices of the Royal Astronomical Society 508, no. 4 (2021): 5354–61. http://dx.doi.org/10.1093/mnras/stab2936.

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ABSTRACT The repeating fast radio burst (FRB) source, FRB 20201124A, was found to be highly active in 2021 March and April. We observed the source with the Effelsberg 100-m radio telescope at 1.36 GHz on 2021 April 9 and detected 20 bursts. A downward drift in frequency over time is clearly seen from the majority of bursts in our sample. A structure-maximizing dispersion measure (DM) search on the multicomponent bursts in our sample yields a DM of 411.6 ± 0.6 pc cm−3. We find that the rotation measure (RM) of the bursts varies around their weighted mean value of −601 rad m−2 with a standard de

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Mészárosová, Hana, Ján Rybák, Marian Karlický, and Karel Jiřička. "Separation of solar radio bursts in a complex spectrum." Proceedings of the International Astronomical Union 6, S274 (2010): 150–52. http://dx.doi.org/10.1017/s1743921311006788.

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AbstractRadio spectra, observed during solar flares, are usually very complex (many bursts and fine structures). We have developed a new method to separate them into individual bursts and analyze them separately. The method is used in the analysis of the 0.8–2.0 GHz radio spectrum of the April 11, 2001 event, which was rich in drifting pulsating structures (DPSs). Using this method we showed that the complex radio spectrum consists of at least four DPSs separated with respect to their different frequency drifts (−115, −36, −23, and −11 MHz s−1). These DPSs indicate a presence of at least four

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Beloborodov, Andrei M. "Damping of Strong GHz Waves near Magnetars and the Origin of Fast Radio Bursts." Astrophysical Journal 975, no. 2 (2024): 223. http://dx.doi.org/10.3847/1538-4357/ad698c.

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Abstract We investigate how a fast radio burst (FRB) emitted near a magnetar would propagate through its surrounding dipole magnetosphere at radii r = 107–109 cm. First, we show that a GHz burst emitted in the O-mode with luminosity L ≫ 1040 erg s−1 is immediately damped for all propagation directions except a narrow cone along the magnetic axis. Then, we examine bursts in the X-mode. GHz waves propagating near the magnetic equator behave as magnetohydrodynamic (MHD) waves if they have L ≫ 1040 erg s−1. The waves develop plasma shocks in each oscillation and dissipate at r ∼ 3 × 10 8 L 42 − 1

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Aggarwal, Kshitij, Devansh Agarwal, Evan F. Lewis, et al. "Comprehensive Analysis of a Dense Sample of FRB 121102 Bursts." Astrophysical Journal 922, no. 2 (2021): 115. http://dx.doi.org/10.3847/1538-4357/ac2577.

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Abstract We present an analysis of a densely repeating sample of bursts from the first repeating fast radio burst, FRB 121102. We reanalyzed the data used by Gourdji et al. and detected 93 additional bursts using our single-pulse search pipeline. In total, we detected 133 bursts in three hours of data at a center frequency of 1.4 GHz using the Arecibo telescope, and develop robust modeling strategies to constrain the spectro-temporal properties of all of the bursts in the sample. Most of the burst profiles show a scattering tail, and burst spectra are well modeled by a Gaussian with a median w

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Sawant, H. S., R. R. Rosa, J. R. Cecatto, and N. Gopalswamy. "Solar simple bursts observed with spectral resolution in the 18-23 GHz range." Astrophysical Journal Supplement Series 90 (February 1994): 693. http://dx.doi.org/10.1086/191891.

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Ghisellini, Gabriele, and Nicola Locatelli. "Coherent curvature radiation and fast radio bursts." Astronomy & Astrophysics 613 (May 2018): A61. http://dx.doi.org/10.1051/0004-6361/201731820.

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Fast radio bursts are extragalactic radio transient events lasting a few milliseconds with a ~Jy flux at ~1 GHz. We propose that these properties suggest a neutron star progenitor, and focus on coherent curvature radiation as the radiation mechanism. We study for which sets of parameters the emission can fulfil the observational constraints. Even if the emission is coherent, we find that self-absorption can limit the produced luminosities at low radio frequencies and that an efficient re-acceleration process is needed to balance the dramatic energy losses of the emitting particles. Self-absorp

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Marthi, V. R., T. Gautam, D. Z. Li, et al. "Detection of 15 bursts from the fast radio burst 180916.J0158+65 with the upgraded Giant Metrewave Radio Telescope." Monthly Notices of the Royal Astronomical Society: Letters 499, no. 1 (2020): L16—L20. http://dx.doi.org/10.1093/mnrasl/slaa148.

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ABSTRACT We report the findings of an upgraded Giant Metrewave Radio Telescope (uGMRT) observing campaign for FRB 180916.J0158+65, which was recently found to show a 16.35-d periodicity of its active cycle. We observed the source at 550–750 MHz for ∼2 h during each of three successive cycles at the peak of its expected active period. We find 0, 12 and 3 bursts, respectively, implying a highly variable bursting rate even within the active phase. We consistently detect faint bursts with spectral energies only an order of magnitude higher than the Galactic burst source SGR 1935+2154. The times of

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Sobacchi, Emanuele, Yuri Lyubarsky, Andrei M. Beloborodov, and Lorenzo Sironi. "Self-modulation of fast radio bursts." Monthly Notices of the Royal Astronomical Society 500, no. 1 (2020): 272–81. http://dx.doi.org/10.1093/mnras/staa3248.

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ABSTRACT Fast radio bursts (FRBs) are extreme astrophysical phenomena entering the realm of non-linear optics, a field developed in laser physics. A classical non-linear effect is self-modulation. We examine the propagation of FRBs through the circumburst environment using the idealized setup of a monochromatic linearly polarized GHz wave propagating through a uniform plasma slab of density N at distance R from the source. We find that self-modulation occurs if the slab is located within a critical radius Rcrit ∼ 1017(N/102 cm−3)(L/1042 erg s−1) cm, where L is the isotropic equivalent of the F

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Rajwade, K. M., D. Agarwal, D. R. Lorimer, et al. "A 21 cm pilot survey for pulsars and transients using the Focal L-Band Array for the Green Bank Telescope." Monthly Notices of the Royal Astronomical Society 489, no. 2 (2019): 1709–18. http://dx.doi.org/10.1093/mnras/stz2207.

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Abstract Phased array feed (PAF) receivers are at the forefront of modern day radio astronomy. PAFs are currently being developed for spectral line and radio continuum surveys and to search for pulsars and fast radio bursts. Here, we present results of the pilot survey for pulsars and fast radio bursts using the Focal plane L-band Array for the Green Bank Telescope (FLAG) receiver operating in the frequency range of 1.3–1.5 GHz. With a system temperature of ∼18 K, the receiver provided unprecedented sensitivity to the survey over an instantaneous field of view (FoV) of 0.1 deg2. For the survey

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Kuzmenko, Irina. "CORONAL JETS AS A CAUSE OF MICROWAVE NEGATIVE BURSTS." Solar-Terrestrial Physics 6, no. 3 (2020): 23–28. http://dx.doi.org/10.12737/stp-63202003.

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We have investigated the cause of three “isolated” negative radio bursts recorded one after another at several frequencies in the 1–17 GHz range at the Nobeyama Radio Observatory, Ussuriysk Astrophysical Observatory, and Learmonth Solar Observatory on April 10–11, 2014. The cause of the rarely observed “isolated” negative bursts is the absorption of radio emission from the quiet Sun’s regions or a radio source in the material of a large eruptive filament. Analysis of observations in different spectral ranges using images from the Nobeyama radioheliograph and the Solar Dynamics Observatory/Atmo

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