Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cha%26a..14..119l&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 14, Issue 2, p. 119-128.
Astronomy and Astrophysics
Astrophysics
Solar Meter Wave, Weak Shock, Loss Cone Instability, Langmuir Wave
Scientific paper
I propose a whistler model of solar meter-wave noise storm driven by evolution of magnetic structures in coronal active regions where magnetic inhomogeneities in the form of strong magnetic filaments are present. The evolution generates weak shocks. Their passage through the filaments heats up some of the electrons which acquire a loss cone distribution. In the storm region the loss cone distribution of the accelerated electrons then generates bright whistler and Langmuir waves. Through induced scattering the Langmuir wave slips to lower wave number region, there to interact strongly with the whistler wave, generating narrow beam electromagnetic radiation (Type I bursts). The field and configuration of the strong magnetic filaments determines the bandwidth and duration of the Type I bursts. The noise continuum is taken to be the product of coupling between the Langmuir wave from isotropic electrons and low frequency waves.
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