High time resolution observations of H alpha line profiles during the impulsive phase of a solar flare

Details High time resolution observations of H alpha line profiles during the impulsive phase of a solar flare High time resolution observations of H alpha line profiles during the impulsive phase of a solar flare

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341.1088w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 1088-1096.

Astronomy and Astrophysics

Astrophysics

52

H Alpha Line, Solar Flares, Solar Spectra, Spectrum Analysis, Temporal Resolution, Line Spectra, Solar X-Rays, X Ray Spectra

Scientific paper

H-alpha observations of the impulsive phase of a 1B/M1 solar flare on May 24, 1987, were carried out with high temporal resolution. A line center imaging system and an imaging spectrograph for line profile acquisition have been operated simultaneously with 0.3 s and 2.3 s temporal resolution, respectively. The temporal evolution at line center and in the blue and red wing have been correlated with hard X-ray data from HXRBS. The observed line profiles have been analyzed in terms of dynamic H-alpha line profile calculations by Canfield and Gayley. The combined H-alpha and hard X-ray signatures of two flare kernels are compatible with the theoretical predictions for strong nonthermal electron heating and the formation of a downward moving chromospheric condensation. A third kernel also shows the predicted downward moving chromospheric material, but its temporal evolution is not compatible with electron beam heating.

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