THEORY OF SOLAR RADIO AND X-RAY PULSATION,
Abstract
The observed modulation of some coronal microwave, x-ray and Type 3 emissions into pulses of 10-sec intervals is a consequence of the stimulation of electron-cyclotron waves propagated in the whistler mode in dipole-like bipolar regions of dimension approximately 0.2 R sub o. Assuming that a power-law spectrum of 7 or = 10 keV electrons with a slope similar to solar flare protons can be trapped in a bipolar region, we show that whistlers can be generated by pitch-angle instability. The resultant approximately 10-sec bounce motion of whistler wave trains leads to enhanced, modulated emission in microwave and x-ray frequencies by pitch-angle scattering of MeV electrons and to modulated Type 3 emission by scattering with coherent plasma waves. A direct prediction of the theory is the existence of sympathetic pulsations at two sources a fraction of a solar radius apart. A second test of the theory is that modulated Type 3 emission should show strong polarization. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1970
- Accession Number
- AD0704116
Entities
People
- Yam T. Chiu
Organizations
- The Aerospace Corporation