Evidence of conversion of plasma waves by scattering on ion-sound waves

Details Evidence of conversion of plasma waves by scattering on ion-sound waves Evidence of conversion of plasma waves by scattering on ion-sound waves

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9622801f&link_type=abstract

Conference Paper, Instituto Nacional de Pesaciais Espaciais Sao Jose dos Campos, Brazil

Computer Science

Sound

Chromosphere, Plasma Waves, Ion Acoustic Waves, Plasma Heating, Coronal Loops, Solar Radio Bursts, Electron Density (Concentration), Solar Atmosphere, Narrowband, Radio Waves, Proton Beams, Electron Beams

Scientific paper

During the initial period of March-August, 1991, the high sensitivity and high resolution solar spectroscope was operating in the narrow frequency range (1600 +/- 50) MHz, in conjunction with a 9-m diameter polar mounted antenna. On 15th June, 1991 (approximately 13:37 UT), using this system, we observed a slow drifting (approximately 5.0 MHz/s), narrow band (1630-1580 MHz) and split frequency (approximately equal to 30 MHz) solar burst lasting for approximately 15 s. The upper split frequency component is more intense than lower split frequency component. Here, we suggest the hypothesis of conversion of plasma waves, excited by an electron (or proton) beam, in the upper chromosphere, and by combinational scattering on upgoing low frequency ion-sound waves in a magnetic loop. In order to explain the observed temporal characteristics of the upper and lower split frequency components, the radiation has to propagate at some angle to the electron density gradient in the source region. The maximum source size over height (approximately equal to 2 x 107 cm), the velocity and the length of ion-sound pulse (approximately equal to 3.1 x 106 cm/s and 5 x 107cm, respectively) and the velocity of the electron (or proton) beam (approximately equal to 5 x 108 cm/s) were estimated.

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