Observations of several small flares with the Bragg Crystal Spectrometer on YOHKOH

Details Observations of several small flares with the Bragg Crystal Spectrometer on YOHKOH Observations of several small flares with the Bragg Crystal Spectrometer on YOHKOH

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44l.101c&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 5, p. L101-L106.

Astronomy and Astrophysics

Astronomy

15

Chromosphere, Plasma Dynamics, Solar Flares, Solar Spectrometers, Spaceborne Astronomy, Bragg Angle, Japanese Spacecraft

Scientific paper

We have analyzed data from two flares of GOES class C7.1 and C8.5 observed by the Yohkoh Bragg Crystal Spectrometer. The high sensitivity of the Yohkoh instrument allows us to observe the very early stages of flare development and to study small events with a high signal-to-noise ratio. Spectral fitting programs have been used to derive plasma temperatures, emission measures and velocities from spectra of S XV, Ca XIX and Fe XXV. Large plasma motions indicative of chromospheric evaporation have been found. A more detailed analysis of a flare which occurred on 1991 October 30 is presented.

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