NDLI: Coronal dimmings and energetic cmes

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Coronal dimmings and energetic cmes

Content Provider	NASA Technical Reports Server (NTRS)
Author	Delannee, C. Thompson, B. J. Cliver, E. W. Nitta, N. Delaboudiniere, J.-P.
Copyright Year	1999
Description	We have analyzed the coronal dimmings for seven fast (> 600 km/s) coronal mass ejections (CMEs) occurring between 23 April and 9 May which were associated with flares from NOAA active region (AR) 8210. These dimming regions were identified by their strong depletion in coronal emission within a half hour of the estimated time of CME lift-off. They included areas which were as dark as quiescent coronal holes as well as other regions with weaker brightness depletions. We found that the extended dimming areas in these events generally mapped out the apparent "footprint" of the CME. In two of the seven cases, a pair of dimmings were more or less symmetrically positioned north and south of the flare site. In the five remaining cases, the dimmings were most prominent to the north of AR 8210 (approximately S15 latitude) and extended well north of the solar equator, consistent with the locations of the CMEs. We discuss the implications of these results for the sigmoid/double dimming/flux rope model of CMEs.
File Size	677233
Page Count	18
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19990109149
Archival Resource Key	ark:/13960/t0fv3hc4n
Language	English
Publisher Date	1999-01-01
Access Restriction	Open
Subject Keyword	Solar Physics Solar Radio Emission Radio Astronomy Depletion Stellar Mass Ejection Brightness Extreme Ultraviolet Explorer Satellite Coronal Holes Soho Mission Dimming Brightness Distribution Stellar Activity Imagery Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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