Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..478f&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We study the relationship between EUV spectral line intensities emitted at transition region temperatures and the photospheric magnetic field in solar active regions. We use magnetograms from SOHO/MDI and EUV spectra of the O V 629.7 A line (220000 K) from the Coronal Diagnostic Spectrometer on SOHO recorded for 25 active regions. We overlay and compare spatial patterns of the OV emission and the magnetic flux concentrations with a 2''x2'' spatial resolution and search for a relationship between the local OV line intensity and the photospheric magnetic flux density in each active region. While this dependence exhibits a certain amount of scatter it can be represented by a power law fit. We find that the power indeces are similar in all regions. Applying static loop models we derive the dependence of the heating rate on the magnetic flux density and compare it to the dependence predicted by the coronal heating models. This spatially resolved analysis extends the previous work of Fludra and Ireland (2002 2003) who studied the relationship between area-integrated coronal line intensities and the total magnetic flux.
Fludra Andrzej
Ireland Jack
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