Detecting the Large Scale Magnetic Helicity Patterns on the Sun using SOLIS/VSM and SDO/HMI fulldisk vector magnetograms

Details Detecting the Large Scale Magnetic Helicity Patterns on the Sun using SOLIS/VSM and SDO/HMI fulldisk vector magnetograms Detecting the Large Scale Magnetic Helicity Patterns on the Sun using SOLIS/VSM and SDO/HMI fulldisk vector magnetograms

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh31a1996g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH31A-1996

Astronomy and Astrophysics

Astrophysics

[7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields

Scientific paper

We use fulldisk vector magnetograms observed by the SOLIS/VSM and SDO/HMI instruments to compute the large scale helicity patterns on the sun. Such studies have been carried out in the past using the vector magnetograms reconstructed from temporal sequence of longitudinal magnetograms. These earlier results suggest the presence of a hemispheric pattern in the sign of current helicity density. However, these reconstructed vector magnetograms have their limitations as they are based on certain assumptions. On the other hand, the direct observations of the vector magnetic field of the full sun by SOLIS/VSM and SDO/HMI instruments can now be used to investigate the large scale magnetic helicity patterns on the sun. We use the newly developed SFQ azimuth disambiguation method in our study. This method has been shown to work better for fulldisk vector magnetograms as it solves the ambiguity in spherical geometry. We present the first results of current helicity computation for full disk vector magnetograms and compare the inferences from two instruments.

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