Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54..481e&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.54, No.3, pp.481-491
Astronomy and Astrophysics
Astronomy
60
Sun: Chromosphere, Sun: Corona, Sun: Flares, Sun: Mhd
Scientific paper
We consider the relationship between two flare-associated waves, a chromospheric Moreton wave and a coronal EIT wave, based on an analysis of an X-class flare event in AR 8100 on 1997 November 4. A Moreton wave was observed in Hα + 0.8 Å, and Hα - 0.8 Å with the Flare-Monitoring Telescope (FMT) at the Hida Observatory. An EIT wave was observed in EUV with the Extreme ultraviolet Imaging Telescope (EIT) on board SOHO. The propagation speeds of the Moreton wave and the EIT wave were approximately 715 km s-1 and 202 km s-1, respectively. The times of visibility for the Moreton wave did not overlap those of the EIT wave, but the continuation of the former is indicated by a filament oscillation. Data on the speed and location clearly show that the Moreton wave differed physically from the EIT wave in this case. The Moreton wave preceded the EIT wave, which is inconsistent with an identification of the EIT wave with a fast-mode MHD shock.
Asai Ayumi
Eto Shigeru
Isobe Hiroaki
Kitai Reizaburo
Kurokawa Hiroki
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