Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999acasn..40...69l&link_type=abstract
Acta Astron. Sin., Vol. 40, No. 1, p. 69 - 75
Astronomy and Astrophysics
Astronomy
Solar Eclipses: Infrared Spectra, Solar Eclipses: 1991 July 11, Solar Eclipses: Solar Prominences
Scientific paper
Introduced are the data and analytical results of infrared spectral observations (10712 - 10972 Å) of the total solar eclipse of July 11, 1991 in Mexico. The surface brightness curve, derived from the continua of the extreme limb photosphere of flash spectra, has a dip at about 210 km inside the solar disk limb. The temperature at the bottom of the chromosphere is about 4425±26K. The flash spectra show that the He I 10803 line reaches a maximum of emission at about 1200 km beyond the photosphere. Spectra of the big prominence at the east limb indicate that it is a very weak prominence with an intensity of 2% - 5% of ordinary prominences. This prominence has a large turbulent velocity (about 30 km/sec) and a blueshift velocity along the light-of-sight (210±15 km/sec).
Li Hui
You Jianqi
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