Article
Astronomy & Astrophysics
F. Crawford, S. Hisano, M. Golden, T. Kikunaga, A. Laity, D. Zoeller
Summary: This study presents four new fast radio bursts (FRBs) discovered in the Parkes 70-cm pulsar survey data archive. These FRBs have significantly larger widths than previously detected ones, suggesting the presence of a larger population of wide-pulse FRBs. The study also highlights the importance of pulsar survey archives as a source of previously undetected FRBs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Engineering, Aerospace
A. C. Umuhire, J. Uwamahoro, K. Sasikumar Raja, A. Kumari, C. Monstein
Summary: High-frequency type II bursts, with their upper-frequency cutoff >= 300 MHz, are found to originate from western longitudes. There is a good correlation (around 0.73) between the average shock speed derived from radio dynamic spectra and the corresponding speed from CME data. Analyzed HF type II bursts are associated with wide and fast CMEs located near the solar disk.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Engineering, Aerospace
Felix N. Minta, Satoshi I. Nozawa, Kamen Kozarev, Ahmed Elsaid, Ayman Mahrous
Summary: This paper presents a detailed investigation of the spectral properties of band splitting type II radio bursts and their association with sunspot number. The study found that the analyzed type II shock height, magnetic field strength, CME/shock speed, and Alfvé n speed synchronize with the trajectory of the solar cycle 24. The study also revealed the highest electron density at the onset of the declining phase of solar cycle 24, and a bimodal distribution of type II bursts frequency with peaks in 2012 and 2015.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Astronomy & Astrophysics
M. Trudu, M. Pilia, G. Bernardi, A. Addis, G. Bianchi, A. Magro, G. Naldi, D. Pelliciari, G. Pupillo, G. Setti, C. Bortolotti, C. Casentini, D. Dallacasa, V Gajjar, N. Locatelli, R. Lulli, G. Maccaferri, A. Mattana, D. Michilli, F. Perini, A. Possenti, M. Roma, M. Schiaffino, M. Tavani, F. Verrecchia
Summary: In this study, a 19-month observational campaign was conducted with the Medicina Northern Cross radio telescope to monitor four repeating sources of fast radio bursts. The results show the successful detection and characterization of three bursts from FRB20180916B, confirming the periodicity of the source. No bursts were detected from the other sources. Lower limits on the slope of the differential fluence distribution were determined for FRB20181030A and FRB20200120E at a 95% confidence level. The non-detection of bursts from FRB20201124A is consistent with the expected rate.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Pawan Kumar, Paz Beniamini
Summary: We investigate the impact of gravitational lensing on fast radio bursts (FRBs) by a plasma screen near the lens or in the path between the source and the observer. Effects include suppressed magnification, modified time delay between images, and broadened light curves due to wave scattering by the plasma. These effects are most pronounced for stellar and sub-stellar mass lenses, and for cosmologically distant lenses and plasma screens. This has implications for measuring the cosmic abundance of FRBs and exploring the reionization history of the universe.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Chen-Hui Niu, Di Li, Rui Luo, Wei-Yang Wang, Jumei Yao, Bing Zhang, Wei-Wei Zhu, Pei Wang, Haoyang Ye, Yong-Kun Zhang, Jia-rui Niu, Ning-yu Tang, Ran Duan, Marko Krco, Shi Dai, Yi Feng, Chenchen Miao, Zhichen Pan, Lei Qian, Mengyao Xue, Mao Yuan, Youling Yue, Lei Zhang, Xinxin Zhang
Summary: FAST discovered three new FRBs through the CRAFTS survey, showing similar characteristics to previously reported FRBs but with some new features, providing new insights for FRB research.
ASTROPHYSICAL JOURNAL LETTERS
(2021)
Article
Astronomy & Astrophysics
Jia-Ming Zhu-Ge, Jia-Wei Luo, Bing Zhang
Summary: In this paper, we use machine learning methods to solve the classification problem of repeater FRBs. We apply multiple unsupervised machine learning algorithms to analyze the features and classify FRBs in the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst catalogue. We reveal the differences between repeaters and non-repeaters and recommend credible repeater candidates for future observing campaigns.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Z. Y. Zhao, G. Q. Zhang, Y. Y. Wang, Zuo-Lin Tu, F. Y. Wang
Summary: Magnetars have been identified as a potential energy source for fast radio bursts (FRBs), potentially formed by core-collapse explosions and compact binary mergers. The expansion of merger ejecta can produce time-evolving dispersion measure and rotation measure to probe local environments of FRBs. Research has shown that in the binary neutron star merger scenario, the age of the FRB source is estimated to be around 9-10 years, with an ambient medium density of approximately 2.5-3.1 cm(-3).
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
J. Katz
Summary: Repeating and apparently non-repeating fast radio bursts (FRBs) are qualitatively different and may be produced by different sources. Although apparently non-repeating FRBs should repeat multiple times in their lifetimes, no infrequent repetitions have been observed so far. They are associated with outbursts of soft gamma repeaters (SGRs), but with lower energy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Silja Pohjolainen, Nasrin Talebpour Sheshvan
Summary: The study suggests that isolated DH type II bursts may be a special subgroup within DH type II bursts, where the radio emission requires particular coronal conditions to form and to die out. The majority of isolated DH type II bursts could be associated with a shock near the CME leading front, with few originating from shocks near the CME flank regions, which differs from earlier findings.
Article
Astronomy & Astrophysics
Rachel C. Zhang, Bing Zhang, Ye Li, Duncan R. Lorimer
Summary: Fast radio bursts (FRBs) are millisecond-duration radio transients from cosmological distances. The study attempts to constrain both the energy distribution and redshift distribution of FRBs through simulations and comparisons with available data. The power-law index of the energy distribution is around -1.8, but the redshift distribution remains unconstrained.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Hongyu Liu, Pietro Zucca, Kyung-Suk Cho, Anshu Kumari, Peijin Zhang, Jasmina Magdalenic, Rok-Soon Kim, Sujin Kim, Juhyung Kang
Summary: A moving Type-IV radio burst with fine structures was studied using the high-resolution capability of LOFAR. The degree of circular polarization gradually increased during the event. The dynamic spectrum of LOFAR showed numerous short-duration fine structures with high brightness temperatures.
Article
Astronomy & Astrophysics
X. Yang, S-B Zhang, J-S Wang, G. Hobbs, T-R Sun, R. N. Manchester, J-J Geng, C. J. Russell, R. Luo, Z-F Tang, C. Wang, J-J Wei, L. Staveley-Smith, S. Dai, Y. Li, Y-Y Yang, X-F Wu
Summary: In this study, a machine-learning algorithm was used to identify 81 new candidate fast radio bursts (FRBs) from a large database of transient events detected by the Parkes radio telescope. The details of these candidate FRBs, including their positions and dispersion measures, were provided as a guide for follow-up observations in the search for repeating FRBs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Siddhartha Bhattacharyya, Somnath Bharadwaj
Summary: By combining constraints from four telescopes, an allowed range of model parameters for the FRB source population has been identified, ruling out values that do not fit within the common allowed region. Further analysis with more FRB data is expected to provide tighter parameter constraints.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
K. Nimmo, J. W. T. Hessels, M. P. Snelders, R. Karuppusamy, D. M. Hewitt, F. Kirsten, B. Marcote, U. Bach, A. Bansod, E. D. Barr, J. Behrend, V Bezrukovs, S. Buttaccio, R. Feiler, M. P. Gawronski, M. Lindqvist, A. Orbidans, W. Puchalska, N. Wang, T. Winchen, P. Wolak, J. Wu, J. Yuan
Summary: The repeating fast radio burst source FRB 20200120E is associated with a globular cluster and exhibits a burst storm with 53 bursts occurring within 40 minutes. The burst storm shows steep energy distribution and a bimodal wait-time distribution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Patrick I. McCauley, Iver H. Cairns, Stephen M. White, Surajit Mondal, Emil Lenc, John Morgan, Divya Oberoi
Article
Physics, Fluids & Plasmas
James C. Harding, Iver H. Cairns, Donald B. Melrose
PHYSICS OF PLASMAS
(2020)
Article
Astronomy & Astrophysics
Iver H. Cairns, Kamen A. Kozarev, Nariaki V. Nitta, Neus Agueda, Markus Battarbee, Eoin P. Carley, Nina Dresing, Raul Gomez-Herrero, Karl-Ludwig Klein, David Lario, Jens Pomoell, Carolina Salas-Matamoros, Astrid M. Veronig, Bo Li, Patrick McCauley
Article
Astronomy & Astrophysics
Ronald Maj, Iver H. Cairns, M. M. Martinovic
Article
Astronomy & Astrophysics
Donald B. Melrose, James Harding, Iver H. Cairns
Summary: The conventional model for the generation of Langmuir waves in Type-III radio bursts is based on a 1D version of quasilinear equations, but in the 3D generalization, different resonance conditions and growth criteria apply, as well as diffusion in both speed and pitch-angle. Another important aspect in the 3D model is the potential scattering of Langmuir waves by turbulence in the ambient plasma, which may impact the evolution of Type-III beams.
Article
Astronomy & Astrophysics
R. P. Sawyer, S. A. Fuselier, C. A. Kletzing, J. W. Bonnell, R. Roglans, S. R. Bounds, M. J. Kim, S. K. Vines, I. H. Cairns, C. Moser, J. LaBelle, J. Moen, K. J. Trattner, S. M. Petrinec, J. L. Burch, B. L. Giles, D. George
Summary: The TRICE 2 mission successfully launched on December 08, 2018 included two sounding rockets measuring electron and ion distributions, electric and magnetic fields, and plasma waves in the northern magnetospheric cusp. Observations showed typical ion cusp features and potential wave-particle interactions affecting low-energy magnetospheric ions.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
C. Moser, J. LaBelle, R. Roglans, J. W. Bonnell, I. H. Cairns, C. Feltman, C. A. Kletzing, S. Bounds, R. P. Sawyer, S. A. Fuselier
Summary: The study indicates the presence of high-frequency and low-frequency waves in the cusp, with possible interactions between the two types of waves, primarily through decay or coalescence.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Samira Tasnim, Gary P. Zank, Iver H. Cairns, L. Adhikari
Summary: Density irregularities scatter radio waves in the solar wind and astrophysical plasmas, affecting the inferred properties of radio sources. This study presents a theory of angular broadening caused by scattering of radio waves by density irregularities, improving the existing formalism. The model includes an inner scale and considers both latitudinal and radial dependencies, providing predictions for turbulence and solar wind quantities.
ASTROPHYSICAL JOURNAL
(2022)
Article
Environmental Sciences
Yiwei Mao, Christopher H. Betters, Bradley Evans, Christopher P. Artlett, Sergio G. Leon-Saval, Samuel Garske, Iver H. Cairns, Terry Cocks, Robert Winter, Timothy Dell
Summary: OpenHSI is an initiative that aims to lower the barriers of entry and bring compact pushbroom hyperspectral imaging spectrometers to a wider audience. By providing an open-source optical design and software platform, it enables the replication and use of these imaging spectrometers by individuals who may not have the financial or technical capability to operate commercial ones, thus opening up new application domains.
Article
Physics, Fluids & Plasmas
Alexander Ryan, Marcela Bilek, Iver H. Cairns, David R. McKenzie
Summary: In this research, specific vacuum arc discharges were simulated using VSim 11 software, covering the entire process from the generation of cathode spots to the streaming plasma discharge at a far field. The simulations were validated against experimental data and showed consistent results in the evolution of ion charge state energy distributions, electrostatic potential peak above the cathode surface, and relative energies between ion charge states.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Joshua J. R. Critchley-Marrows, Xiaofeng Wu, Iver H. Cairns
Summary: Recent literature has explored the use of sole attitude determination devices, particularly star trackers, for accurate and precise measurement of angular velocity. The state approach is found to be more effective than error-based filtering in this aspect, providing important implications for space situational awareness object localization.
Article
Chemistry, Analytical
Yiwei Mao, Christopher H. Betters, Samuel Garske, Jeremy Randle, K. C. Wong, Iver H. Cairns, Bradley J. Evans
Summary: This study successfully developed a fully open-source data acquisition system that can collect hyperspectral and navigation data concurrently for direct georeferencing. The system utilizes low-cost, lightweight, and deployable devices, and employs commercial-off-the-shelf hardware and open-source software, providing an affordable solution for hyperspectral data remote sensing.
Article
Astronomy & Astrophysics
S. A. Boardsen, E. -H. Kim, J. L. Green, C. Z. Cheng, I. H. Cairns, J. R. Johnson
Summary: The beaming angle of nonthermal continuum radiation in the dawn sector of the Van Allen Probes-A mission was calculated. A distinct inverted-V pattern of the beaming angle versus magnetic latitude was observed, with the apex near the magnetic equator. This pattern was attributed to the large variation in the plasmapause location. The study supports the dominant mechanism for nonthermal continuum radiation with frequencies below 100 kHz to be the linear mode conversion theory, while an unidentified mechanism becomes important for frequencies above 100 kHz.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2023)
Article
Astronomy & Astrophysics
Andrew Zic, Tara Murphy, Christene Lynch, George Heald, Emil Lenc, David L. Kaplan, Iver H. Cairns, David Coward, Bruce Gendre, Helen Johnston, Meredith MacGregor, Danny C. Price, Michael S. Wheatland
ASTROPHYSICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
Surajit Mondal, Atul Mohan, Divya Oberoi, John S. Morgan, Leonid Benkevitch, Colin J. Lonsdale, Meagan Crowley, Iver H. Cairns
ASTROPHYSICAL JOURNAL
(2019)