Acceleration of electrons outside flares - Coronal manifestation and possible origin

Details Acceleration of electrons outside flares - Coronal manifestation and possible origin Acceleration of electrons outside flares - Coronal manifestation and possible origin

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..298r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 1, Nov. 1991, p. 298-306.

Astronomy and Astrophysics

Astrophysics

23

Coronal Loops, Electron Acceleration, Solar Corona, Solar Electrons, Solar Flares, Solar Magnetic Field, Solar Atmosphere, Solar Flux Density, Solar Storms

Scientific paper

Imaging observations at decimetric and metric wavelengths of the solar corona are used to investigate a short-lasting noise storm and the associated changes of the underlying active-region plasma. It is shown that a new source appears in the active region in close temporal and spatial coincidence with the onset of the noise storm in the middle corona. The onset of the noise storm is delayed at longer wavelengths. At a given wavelength, the noise-storm source undergoes a systematic slow movement with a significant component perpendicular to the magnetic-field lines above the active region. The observations are tentatively attributed to the emission of nonthermal electrons in a system of expanding coronal loops, the expansion being initiated by the appearance of the new 21-cm source in the low atmosphere. The derived velocity of expansion is about 80 to 150 km/s. The electrons emitting the noise storm cannot be provided by the high-energy tail of the Maxwellian in the new active region source, but originate either from a nonthermal population in this source or from acceleration at higher altitudes, in the structures which give rise to the noise storm.

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