Physics
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mwoc.conf..341f&link_type=abstract
Multi-Wavelength Observations of Coronal Structure and Dynamics -- Yohkoh 10th Anniversary Meeting. Proceedings of the conferenc
Physics
Scientific paper
We have examined the evolution and modulation of the Sun's atmosphere from the photosphere up to the outer corona through the decline and rise of solar cycles 22, and 23 respectfully. For this we have used Yohkoh soft X-ray telescope (SXT) images, Kitt peak magnetograms and EUV spectra provided by the Coronal Diagnostic Spectrometer (CDS). We find as Hara (1996, 1997) found, that there is a modulation of the coronal brightness which varies annually in the high latitude activity zones, and that this is linked to the presence and disappearance of active regions on the sun's disk. We interpret our results with regards to the emergence and diffusion of magnetic flux. We find that the appearance of high latitude activity zones may be explained simply by the decay of diffused active region flux, We also find evidence for a positive temperature gradient within the corona from the emission profiles in the different lines.
Culhane Leonard J.
Foley Carl R.
Mackay Dr.
Moroney C.
Patsourakos Spiros
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