Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sp41b06l&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SP41B-06
Other
7524 Magnetic Fields, 7529 Photosphere, 7594 Instruments And Techniques
Scientific paper
All ground-based instruments are subject to atmospheric seeing; here we attempt to quantify the effects of atmospheric seeing on vector magnetograph observations and the parameters derived from them. We present the results of our study on the effect of seeing using Imaging Vector Magnetograph (IVM) raw data and subsequent data reduction. The blurring due to seeing is modeled by convolving a Gaussian function with various widths with raw polarization data of good-seeing quality to simulate different seeing conditions. The IVM data reduction procedure is carried out on all data to arrive at vector magnetic flux and velocity images; from these are derived commonly used parameters such as vertical current density, shear angle and magnetic free energy. We find that poorer seeing conditions during observations reduce the derived magnetic field strength, as expected, and influence the other parameters in generally expected ways. Our study results in defining the limits on uncertainties due to seeing in parameters derived from vector magnetic flux observations.
Leka Kimberly Dawn
Rangarajan K. E.
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