Transient coronal extreme ultraviolet emission before and during the impulsive phase of a solar flare

Details Transient coronal extreme ultraviolet emission before and during the impulsive phase of a solar flare Transient coronal extreme ultraviolet emission before and during the impulsive phase of a solar flare

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...344..504n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 344, Sept. 1, 1989, p. 504-512. Research supported by NASA.

Astronomy and Astrophysics

Astrophysics

27

Extreme Ultraviolet Radiation, Solar Corona, Solar Flares, Solar X-Rays, H Alpha Line, Magnetic Field Configurations, Solar Magnetic Field, Solar Prominences

Scientific paper

Transient coronal EUV emission, recorded in an emission line of Fe XI at 180.4 A, has been observed prior to and during the initial stages of a solar flare. This emission provides direct evidence of the interactions between the lower corona and the chromosphere during flare initiation. The first EUV enhancement was correlated with activation and eruption of a filament, extended over a distance of about 120,000 km, and had an emission maximum at the site of filament disruption. A moving source of EUV emission also appeared along the trajectory of the erupting filament as it accelerated through the low corona. The mass of this source is estimated to be greater than that of the initial filament or surrounding corona, implying an additional mass ejection from the chromosphere. EUV emission during the impulsive phase of the flare consisted of transient sources along the photospheric magnetic neutral line, with intervening regions of lesser intensity that are interpreted as transient coronal loops below the erupting filament.

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