The flare of 1991 June 4 (importance 3B) and the associated Moreton wave
Abstract
We observed a Moreton wave associated with a flare of importance 3B in the NOAA region 6659 on 1991 June 4. The Moreton wave was emitted from a flare bright point and initially showed the form of a loop. The speed of the Moreton wave was initially 1500 km s-1 and was later accelerated to 1800 km s-1. This acceleration may be due to the propagation of the wave into a coronal hole (with low density and high Alfvén velocity.
- Publication:
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Report of the National Astronomical Observatory of Japan
- Pub Date:
- September 2003
- Bibcode:
- 2003RNAOJ...6..101Y
- Keywords:
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- Solar Flares;
- Solar Coronal Holes