Electron acceleration sites in a large-scale coronal structure.

Details Electron acceleration sites in a large-scale coronal structure. Electron acceleration sites in a large-scale coronal structure.

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320..612k&link_type=abstract

Astronomy and Astrophysics, v.320, p.612-619

Astronomy and Astrophysics

Astrophysics

26

Sun: Corona, Sun: Flares, Sun: Magnetic Field, Sun: Particle Emission, Sun: Radio Radiation, Acceleration Of Particles

Scientific paper

Radio observations and interplanetary particle measurements have shown that even in the absence of conspicuous violent processes in the low atmosphere (such as Halpha_ flares) electrons are accelerated in the corona, most likely at higher altitudes than during flares (>=0.5Rsun_ above the photosphere). The paper presents direct evidence on the acceleration sites from a case study of radio, visible light and soft X-ray observations: electrons are repeatedly accelerated in a large-scale coronal structure which is identified with a streamer in coronographic observations. Energy is simultaneously released in an active region near the base of the structure and at a height of ~1Rsun_, over several hours before the large-scale structure erupts. Energy input is observed in at least two emerging active regions underneath the streamer. The coronal configuration is three-dimensional, overlying a whole quadrant of the Sun. It is argued that the observations trace multiple sites of energy release presumably in current sheets embedded within the streamer, in agreement with scenarios developed for the acceleration of electrons seen in the corona and at 1AU, and for the evolution of large-scale coronal structures towards eruption.

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