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Active Longitudinal Structures of the Sun from MDI and EIT Observations

Published online by Cambridge University Press:  13 May 2016

E. E. Benevolenskaya ,
A. G. Kosovichev  and
P. H. Scherrer
E. E. Benevolenskaya
Affiliation:
Pulkovo Astronomical Observatory, St. Petersburg, Russia W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA
A. G. Kosovichev
Affiliation:
W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA
P. H. Scherrer
Affiliation:
W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA

Abstract

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We present results of investigation of the large-scale structure of the solar corona during the transition period between solar cycles 22 and 23 and at the beginning of the current cycle 23 using the SOHO/EIT EUV data obtained in 171 Å, 195 Å, 284 Å and 304 Å lines. For this analysis the data were transformed into synoptic maps for each of the spectral lines, and for the 195/171 line ratio which is an index of the coronal temperature. The synoptic maps reveal stable longitudinal structures in the coronal intensities and temperature, which are related to large-scale magnetic field structures. We discuss the relation between the coronal and photospheric magnetic structures obtained from the SOHO/MDI data, and compare the rotation rates of these structures with the rotation profile of the solar interior in order to determine the possible origin of the coronal structures.

Type
Session III: Active Region Structure and Dynamics
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 251 - 253
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

Benevolenskaya, E.E., Hoeksema, J.T., Kosovichev, A.G., and Scherrer, P.H. 1999, The interaction of the new and old magnetic fluxes at the beginning of solar cycle 23, Astrophys. J. Lett., 517, L163.Google Scholar
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