Computer Science
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505..405f&link_type=abstract
In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun
Computer Science
Coronal Heating, Magnetic Field, Active Regions, Euv Emission
Scientific paper
Fludra and Ireland (2002) established empirical power-laws between the EUV line intensity averaged over the active region area and the magnetic flux density, using SOHO/MDI magnetograms and two EUV spectral lines, O V 629.7 Å (2.2×105K) and Fe XVI 360.76 Å (2.0×106K), recorded by the SOHO Coronal Diagnostic Spectrometer for 45 active regions. These relationships were used to derive the heating rate as a function of the magnetic flux density. In this paper we examine a subset of 26 active regions without sunspots, to investigate the change in these relationships in the absence of strong sunspot magnetic fields. We find a reduced power index in the power-law dependence between the average line intensities and the magnetic flux density. This translates as a reduced power index in the dependence of the heating rate on the magnetic flux density, EH ∝ B0.9, and affirms that most of the DC models of coronal heating, predicting an EH ∝ B2 dependence, are incompatible with our observations.
Fludra Andrzej
Ireland Jack
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