Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh11a0692i&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SH11A-0692
Physics
7509 Corona, 7524 Magnetic Fields, 7549 Ultraviolet Emissions
Scientific paper
Several authors have previously noted the existence of power law relationships between the total unsigned photospheric magnetic flux and the intensities of a variety of spectral lines emitted by active regions. Applying this approach to more recent datasets, it is shown that power law relationships exist for extreme ultraviolet (EUV) emission data observed by the Coronal Diagnostic Spectrometer (CDS) and photospheric flux as measured by the Michelson Doppler Imager (MDI), both on-board the Solar and Heliospheric Observatory (SOHO). Four spectral lines are examined, covering a wide range of temperatures: He I 584.3 Å (2x 104~K), O V 629.7 Å (2.2 x 105~K), Mg IX 368.06 Å (9.5 x 105~K), and Fe XVI 360.76 Å (2.0 x 106~K). Relations are established between total EUV intensities and photospheric magnetic flux as well as average EUV intensity and magnetic flux density. Comments are also made on the viability of various coronal heating models in the light of these results.
Fludra Andrzej
Ireland Jack
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