Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983cha%26a...7...49y&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 7, Issue 1, p. 49-53.
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
I propose a non-linear wave-wave interaction mechanism for the solar Type-IVdm bursts and explain how to calculate its spectrum numerically. I assume the burst source to be a magnetic bottle of strength 4-23 G at a distance of 0.6 Rsolar in the corona. It captures the non-thermal electrons (E0 = 100 keV) accelerated during the burst phase. These anisotropic electrons excite at the same time Langmuir and whistler waves. The non-linear interaction between these two waves produces the transverse waves of the Type-IV bursts. The calculated spectrum for the 1972 August 2 0330 burst agrees well with the observed spectrum. A comparison between the two gives the number density distribution of non-thermal electrons with frequency (height), a mean value of 372/cm3 and a total number of 1032. This is one order of magnitude below that required by the gyro-synchrotron mechanism. I shall also discuss the possibility of the modulation of Langmuir wave by the whistler wave causing the oscillation of the decimetric burst with time.
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