Active Longitudes in Solar Corona

Details Active Longitudes in Solar Corona Active Longitudes in Solar Corona

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000spd....31.0226b&link_type=abstract

American Astronomical Society, SPD Meeting #31, #02.26; Bulletin of the American Astronomical Society, Vol. 32, p.815

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present the results of the 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 Angstroms, 195 Angstroms, 284 Angstroms and 304 Angstroms lines. For this analysis the data were transformed into synoptic maps for each of the spectral lines, and for the 195 Angstroms/171 Angstroms 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.

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