Far-side seismic maps with HMI

Details Far-side seismic maps with HMI Far-side seismic maps with HMI

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh12a..01g&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH12A-01

Astronomy and Astrophysics

Astrophysics

[7522] Solar Physics, Astrophysics, And Astronomy / Helioseismology, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7529] Solar Physics, Astrophysics, And Astronomy / Photosphere

Scientific paper

Seismic maps of the far side of the Sun have proven their capability to locate and track medium to large active regions on the non-visible hemisphere. Waves that travel all the way from the far side to the front side carry information of the magnetic perturbations that they encounter. The seismic holography technique makes use of the observation of waves at the front side of the Sun and compares them to a model to map areas of strong magnetic field on the far side. Recent improvements to these maps include a more accurate determination of the location of the active region, automatic highlighting of candidates, and calibration in terms of the magnetic field strength. Since the launch of SDO, the Helioseismic Magnetic Imager(HMI) has been providing maps of the far-side activity. We discuss here strategies to optimize these far-side maps as well as how to include extra information (such as realistic error estimates and area determination) in order to use these maps as input to irradiance and photospheric flux-transport models. Far-side direct observations from STEREO will help to reach these goals.

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