Acceleration of electrons outside flares: Evidence for coronal evolution and height-extended energy release during noise storms

Details Acceleration of electrons outside flares: Evidence for coronal evolution and height-extended energy release during noise storms Acceleration of electrons outside flares: Evidence for coronal evolution and height-extended energy release during noise storms

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..536r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 2, p. 536-550

Astronomy and Astrophysics

Astronomy

25

Electromagnetic Noise, Electron Acceleration, Magnetic Storms, Radio Astronomy, Solar Activity, Solar Corona, Solar Electrons, Stellar Evolution, Radio Spectra, Solar Prominences, Solar Radiation, Solar X-Rays, Spectroheliographs, X Ray Sources

Scientific paper

The injection of suprathermal electrons in the solar corona in the absence of flares is witnessed by noise storm emission at decimetric and metric wavelengths. A sample of nine noise storm continua is studied by multifrequency imaging observations. The radio observations show the frequent existence of time delays of the noise storm onsets at low frequencies and the ubiquity of broadband fluctuations of the continuum emission on time scales of several minutes. These results agree with the idea that noise storms are due to superthermal electrons injected and trapped in extended coronal structures (or parts of such structures). In order to carry out several bounces in such structures, the electrons must have energies of some tens of keV. A key result is that the noise storms are systematically accompanied by a brightening of the Sun flux at soft X-ray wavelengths. The frequency comparable duration of soft X-ray brightenings and noise storms and occasional common features in the time profiles during the rise of the emissions point to a physical link between the heating of the plasma in the active region and the injection of electrons into the overlying corona. On the other hand, pronounced differences in the later phase suggest that the mechanism which heats the soft X-ray emitting plasma does not simultaneously supply the electrons which radiate the noise storms being born in evolving systems of large-scale magnetic loops, when the coronal magnetic field restructures itself in response to a perturbation of the underlying active region.

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