Spectral evolution of multiply impulsive solar bursts
Journal Article
·
· Astrophys. J.; (United States)
Hard X-ray and microwave observations of multiply impulsive solar bursts, identified in the OSO 5 data, have been analyzed in a search for the physical basis of the multiplicity of spikes within these events. Spectra in both frequency ranges have been used to determine whether the source properties change from peak to peak within individual bursts. Two categories of microwave spectral behavior have been identified: those events during which the turnover frequency and spectral shape change significantly. These categories correspond to two classes of multiply impulsive bursts: those for which the emission can be characterized by a constant magnetic field and therefore a single source region, in which case the multiplicity may be due to modulation of the emission process; and those in which groups of component spikes appear to originate in regions of different magnetic-field strengths, corresponding to separate source regions which flare sequentially. Examples of the latter type of events are presented, with a detailed analysis of the discrete flaring regions and estimates of their spatial separations.
- Research Organization:
- Laboratory for Astronomy and Solar Physics, NASA Goddard Space Flight Center, Greenbelt, Maryland
- OSTI ID:
- 5543361
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 233:4; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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