34th Solar Physics Division Meeting, June 2003
Session 4 Corona II
Poster, Monday, June 16, 2003, 3:30-5:00pm, Mezzanine

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[4.10] Multi-Wavelength Synoptic Study of Coronal Holes and Magnetic Fields

G. de Toma (NCAR/HAO), C.N. Arge (CU/CIRES, NOAA/SEC, NCAR/HAO), T.E. Holzer (NCAR/HAO), L.R. Mayer (CU/CIRES, NOAA/SEC, NCAR/HAO)

Using a combination of photospheric field and irradiance data (such as Halpha, HeI 1083nm, and EUV wavelengths) in the form of solar synoptic maps along with potential field source surface (PFSS) extrapolations, we study the morphology and evolution of large-scale structures such as coronal holes and filament channels over the course of a few solar rotations. Multiple wavelengths are useful to correctly distinguish such features, that may have similar contrast at EUV wavelengths. We select the time period between January and March 2002, during the maximum phase of solar cycle 23, because of the relevant changes in coronal holes and active regions distribution. We compare the observational data with the results of a potential field source surface model calculation to assess how well the model captures the large scale structure as well as its ability to identify coronal holes versus filament channels.


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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.