Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp13a..03e&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SP13A-03
Other
7522 Helioseismology, 7524 Magnetic Fields
Scientific paper
We have modeled the effect of changes in the shape of the spectral line used for the GONG and MDI observations, and we investigate the consequences for measurements of properties of oscillations and flares. We find that magnetic field measurements are not very sensitive to line shape changes, but velocity estimates do strongly depend on line variations. Using simulated observations of a flare we find that recently observed associated magnetic field changes are not due to line shape changes. On the other hand, a simulation of an oscillation indicates that at least part of the observed amplitude suppression in an active region is due to variations in the line shape. We also report preliminary results of the effect of vertical phase variations across the line profile on the helioseismic observations. This work is carried out through the National Solar Observatory Research Experiences for Undergraduate (REU) site program, which is co-funded by the Department of Defense in partnership with the National Science Foundation REU Program. This work utilizes data obtained by the Global Oscillation Network Group (GONG) project, managed by the National Solar Observatory, which is operated by AURA, Inc. under a cooperative agreement with the National Science Foundation. The data were acquired by instruments operated by the Big Bear Solar Observatory, High Altitude Observatory, Learmonth Solar Observatory, Udaipur Solar Observatory, Instituto de Astrofísica de Canarias, and Cerro Tololo Interamerican Observatory.
Edelman F.
Hill F. F.
Howe Rachel
Komm Rudi
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