X-Ray Expanding Features Associated with a Moreton Wave

Details X-Ray Expanding Features Associated with a Moreton Wave X-Ray Expanding Features Associated with a Moreton Wave

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56l...5n&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.56, No.2, pp. L5-L8

Astronomy and Astrophysics

Astronomy

13

Shock Waves, Sun: Chromosphere, Sun: Corona, Sun: Flares

Scientific paper

We report on the simultaneous observation of a Moreton wave in Hα and two kinds of coronal expanding features in soft X-rays near the solar limb. We consider the faster X-ray feature and the slower one as being an ``X-ray wave'' and ``ejecta'', respectively. The chromospheric Moreton wave propagated on the solar disk at a speed of 1040 ± 100 km s-1 whereas the coronal X-ray wave propagated outside of the disk toward the outer corona at 1400 ± 250 km s-1. We identified the X-ray wave as MHD fast-mode shock. The fast-mode Mach number (Mf) of the X-ray wave was also estimated to be about 1.13-1.31, which decreases during propagation. The timing when the Mf became ``1'' is consistent with that of the disappearance of the Moreton wave. Moreover, we discuss the 3-dimensional structure of the shock wave and the relation between the shock wave and the ejecta (and Hα filament eruptions).

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