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Temperature structure of active regions deduced from helium-like sulphur linesSolar active-region temperatures have been determined from the full-Sun spectra of helium-like sulfur (S XV) observed by the Bragg Crystal Spectrometer on Board the Yohkoh satellite. The average temperature deduced from S XV is demonstrated to vary with the solar activity level: A temperature of 2.5 x 10(exp 6) K is derived from the spectra taken during low solar activity, similar to the general corona, while 4 x 10(exp 6) K is obtained during a higher activity phase. For the latter, the high- temperature tail of the differential emission measure of active regions is found most likely due to the superposition of numerous flare-like events (micro/nano-flares).
Document ID
19950059825
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Watanabe, Tetsuya
(National Astronomical Observatory Tokyo, Japan)
Hara, Hirohisa
(National Astronomical Observatory Tokyo, Japan)
Shimizu, Toshifumi
(University of Tokyo Bunkyo-ku, Japan)
Hiei, Eijiro
(Meisei University Tokyo, Japan)
Bentley, Robert D.
(Mullard Space Science Laboratory Surrey, United Kingdom)
Lang, James
(Rutherford Appletown Laboratory Oxon, United Kingdom)
Phillips, Kenneth J. H.
(Rutherford Appletown Laboratory Oxon, United Kingdom)
Pike, C. David
(Rutherford Appletown Laboratory Oxon, United Kingdom)
Fludra, Andrzej
(Rutherford Appletown Laboratory Oxon, United Kingdom)
Bromage, Barbara J. I.
(University of Central Lancashire Lancs, United Kingdom)
Date Acquired
August 16, 2013
Publication Date
March 1, 1995
Publication Information
Publication: Solar Physics
Volume: 157
Issue: 2-Jan
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
95A91424
Funding Number(s)
CONTRACT_GRANT: MOESC-03402002
CONTRACT_GRANT: MOESC-01044044
Distribution Limits
Public
Copyright
Other

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