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Magnetic properties of X-ray bright pointsUsing high-resolution Kitt Peak National Observatory magnetograms and sequences of simultaneous S-054 soft X-ray solar images, the properties of X-ray bright points (XBP) and ephemeral active regions (ER) are compared. All XBP appear on the magnetograms as bipolar features, except for very recently emerged or old and decayed XBP. The separation of the magnetic bipoles is found to increase with the age of the XBP, with an average emergence growth rate of 2.2 plus or minus 0.4 km per sec. The total magnetic flux in a typical XBP living about 8 hr is found to be about two times ten to the nineteenth power Mx. A proportionality is found between XBP lifetime and total magnetic flux, equivalent to about ten to the twentieth power Mx per day of lifetime.
Document ID
19770067108
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Golub, L.
(American Science and Engineering, Inc. Cambridge, MA, United States)
Krieger, A. S.
(American Science and Engineering, Inc. Cambridge, Mass., United States)
Harvey, J. W.
(Kitt Peak National Observatory Tucson, Ariz., United States)
Vaiana, G. S.
(Harvard College Observatory and Smithsonian Astrophysical Observatory Cambridge, Mass., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1977
Publication Information
Publication: Solar Physics
Volume: 53
Subject Category
Solar Physics
Accession Number
77A49960
Funding Number(s)
CONTRACT_GRANT: NAS8-31374
CONTRACT_GRANT: NAS8-27758
Distribution Limits
Public
Copyright
Other

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