Coordinated spectral and temporal H-alpha observations of a solar flare

Details Coordinated spectral and temporal H-alpha observations of a solar flare Coordinated spectral and temporal H-alpha observations of a solar flare

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..761d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 2, p. 761-767.

Astronomy and Astrophysics

Astrophysics

14

Chromosphere, H Alpha Line, Solar Corona, Solar Flares, Solar Spectra, Electron Precipitation, Emission Spectra, Spectral Resolution, Spectroheliographs, Temporal Resolution

Scientific paper

We report simultaneous observations of a flare (1991 January 11 18:25 UT) with a combination of spectra and high time resolution images in H-alpha. The Mees Solar Observatory CCD Imaging Spectrograph obtains spectra and spectroheliograms with a repetition rate of 14 s. These data permit the identification of sites of nonthermal electron precipitation or of high coronal pressure. We observe extremely strong electron precipitation in this flare; we find reasonable agreement between the observed profiles and theoretical precipitation spectra. We discuss the possibility that the spectra classed as precipitation signatures are in fact the result of a projection effect, and we indicate limitations of the one-dimensional theoretical models.

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