Far-side Helioseismic Holography: Calibrating The Signature Of Active Regions.

Details Far-side Helioseismic Holography: Calibrating The Signature Of Active Regions. Far-side Helioseismic Holography: Calibrating The Signature Of Active Regions.

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2212g&link_type=abstract

American Astronomical Society Meeting 210, #22.12; Bulletin of the American Astronomical Society, Vol. 39, p.126

Astronomy and Astrophysics

Astronomy

Scientific paper

Synoptic maps of the far hemisphere of the Sun calculated from seismic holography have proven to be very reliable in localizing large active regions before they rotate onto the visible hemisphere. Both the Michelson Doppler Imager (MDI) and the Global Oscillation Network Group (GONG) provide daily far-side maps of magnetic activity using this technique.
We show here the first results towards a calibration of the far-side signatures of active regions in terms of active region size and magnetic field strength. We compare helioseismic maps of large active regions on the far side of the Sun, calculated from GONG Doppler observations, with magnetic and visible-continuum images of the same active regions on the visible hemisphere before and after their far-side passage. We find a significant correlation between the far-side signature and both the total area of the active region, as viewed on the near hemisphere, and the area of the sunspots contained in the active region. We have studied the relationship between the magnetic field strength and the phase signature for six of the larger, more stable active regions. We find an approximately logarithmic increase in the seismic phase signature with increasing magnetic field strengths above a critical field of 10 Gauss.

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