Millisecond solar radio spikes

G.D. Fleishman^a, b, V.F. Mel’nikov^c
^aIoffe Institute, ul. Polytekhnicheskaya 26, St. Petersburg, 194021, Russian Federation
^bNew Jersey Institute of Technology, Newark, New Jersey, USA
^cScientific Research Institute of Radio Physics, ul. B. Pecherskaya 25, Nizhnii Novgorod, 603600, Russian Federation

Currently available models of one of the most intriguing types of unsteady rf solar emission, millisecond solar radio spikes, are discussed. A comparative analysis of the models’ implications and of the body of existing data yields an outline of the most realistic radio spike model possible. The spikes are produced by the cyclotron maser mechanism. The cyclotron cone instability is caused by fast electrons distributed over energies according to a (piecewise) power law. The angular part of the distribution function (whose exact form is, as yet, undetermined) suffers fluctuations due to the magnetic field inhomogeneities that arise in the burst loop as a consequence of the original energy release. In some portions of the loop the distribution is not anisotropic enough to secure the development of a cyclotron instability; it is in these ’microtraps’ where individual spikes form. Key areas of future theoretical and experimental research are suggested with a view to verifying the adequacy and realizing the diagnostic potential of the model.

PACS: 96.60.−j
DOI: 10.1070/PU1998v041n12ABEH000510
URL: https://ufn.ru/en/articles/1998/12/a/
Web of Science

000078107700001
Citation: Fleishman G D, Mel’nikov V F "Millisecond solar radio spikes" Phys. Usp. 41 1157–1189 (1998)

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Оригинал: Флейшман Г Д, Мельников В Ф «Солнечные миллисекундные радиоспайки» УФН 168 1265–1301 (1998); DOI: 10.3367/UFNr.0168.199812a.1265

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