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Spectral analysis of the 3B flare on September 19, 1979: asymmetries and shifts of metallic lines
- Source :
- Chinese Astronomy and Astrophysics. 17:413-422
- Publication Year :
- 1993
- Publisher :
- Elsevier BV, 1993.
-
Abstract
- The asymmetries and Doppler shifts of metallic lines of the 3B flare on September 19, 1979 are investigated in this paper. The results show that: (1) red asymmetries dominate in strong metallic lines, but blue asymmetries also exist in some weak lines; (2) the maximum of the line asymmetry always precedes the maximum of the line intensity; (3) the blue asymmetry occurs generally in the early phase, and can occasionally turn to a red one in the later phase; and (4) the line center has no obvious shift, regardless of the line asymmetry. It is proposed that, the mass motions around the temperature minimum region caused by the impulsive heating or the propagation of the chromospheric condensation can explain these observational results. The study on metallic lines has an auxiliary help for understanding the dynamic process in the lower atmosphere of solar flares.
- Subjects :
- Physics
Solar flare
business.industry
media_common.quotation_subject
Condensation
Phase (waves)
Astronomy and Astrophysics
Astrophysics
Asymmetry
law.invention
Atmosphere
symbols.namesake
Optics
Space and Planetary Science
law
symbols
Astrophysics::Solar and Stellar Astrophysics
business
Doppler effect
Line (formation)
media_common
Flare
Subjects
Details
- ISSN :
- 02751062
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- Chinese Astronomy and Astrophysics
- Accession number :
- edsair.doi...........ecd1d1ddcdd2ae1e6e50e63862ed2eb1