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EUV analysis of polar plumes

โœ Scribed by Imad A. Ahmad; George L. Withbroe

Publisher
Springer
Year
1977
Tongue
English
Weight
761 KB
Volume
53
Category
Article
ISSN
0038-0938

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โœฆ Synopsis

Three polar plumes were studied using Sk}lab Mg x and O \q data. The plulues lie within the boundaries of a polar coronal hole. We find that the mean temperature of the plumes is about I.J x 1() r' K and that they have a small xertical temperature gradient. Densities are determined and found consistcnt with white ligh! analyses. The variation of density with height in the plumes is compared with that expected for hydrostatic equilibrium. As is the case for other coronal features, polar plumes will be a source of solar wind if the magnetic field lines are open. On the basis of the derived plume model and estimates of lhe numbcrs of plumes in polar coronal holes, it appears that polar plumes contain about 15% of the mass in a typical polar hole and occupy about 10% of the vohlnle.

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