Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..498h&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
Using spectral data from the Coronal Diagnostic Spectrometer (CDS) instrument on the Solar and Heliospheric Observatory (SOHO) spacecraft we observe a coronal wave feature which occurred in association with a solar eruption and flare on 1998 June~13. EUV images from the Transition Region and Coronal Explorer (TRACE) satellite show that the coronal wave consists of two aspects: (1) a ``bright wave'' which shows up prominently in the TRACE difference images moves with a velocity of approximately 200km/s and is followed by a strong dimming region behind it and (2) a ``weak wave'' which is faint in the TRACE images has a velocity of about 500km/s and appears to disperse out of the bright wave. A ``high-velocity'' CDS feature however occurs after the weak wave passes which appears to correspond to ejection of cool filament-like material in TRACE images. Our observations have similarities with a numerical simulation model of coronal waves presented by Chen etal (2002) who suggests that coronal waves consist of a faster-propagating piston-driven portion and a more slowly-propagating portion due to the opening of field lines associated with an erupting filament.
Harra Louise K.
Sterling Alphonse C.
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