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Active region mass motions observed in soft X-ray linesSignificant coronal mass motions are deduced from soft X-ray line broadening observed in solar active regions even during quiescent periods. A large data base of Mg XI resonance line profiles near 9.17 A has been acquired with the SMM Flat Crystal Spectrometer for a variety of active region conditions and disk locations. For the X-ray bright areas, the typical profiles have an excess line width equal to or greater than the thermal Doppler width for Mg ions at the observed coronal temperatures (3-4 MK). The equivalent excess velocities of 40-60 km/s are higher than those reported previously for cooler lines in other wavebands. The excess velocities show a correlation with magnetic field strength or gradient, but no obvious dependence on the angular distance from sun center.
Document ID
19910044896
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Saba, J. L. R.
(Lockheed Solar and Astrophysics Laboratory Greenbelt, MD, United States)
Strong, K. T.
(Lockheed Solar and Astrophysics Laboratory Palo Alto, CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1991
Publication Information
Publication: Advances in Space Research
Volume: 11
Issue: 1 19
ISSN: 0273-1177
Subject Category
Solar Physics
Accession Number
91A29519
Funding Number(s)
CONTRACT_GRANT: NAS5-28713
CONTRACT_GRANT: NAS5-30431
Distribution Limits
Public
Copyright
Other

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