3D Differential Emission Measure of the 2008 Solar Minimum Corona with Dual-Spacecraft EUVI/STEREO Tomography

VÁSQUEZ, ALBERTO M.; FRAZIN, RICHARD A.; MANCHESTER IV, WARD B.

San Francisco, CA, EEUU

Congreso; 2009 American Geophysical Union Fall Meeting; 2009

American Geophysical Union

We present results derived from a dual-spacecraft tomographic reconstruction of the solar corona three-dimensional (3D) extreme ultraviolet (EUV) emissivity. We use simultaneously taken STEREO A and B spacecraft EUVI images from Carrington rotation 2077 (2008, November 20 06:56 UT through December 17 14:34 UT). The two spacecraft were separated by 83 degrees, allowing the reconstruction to be performed with data gathered in about 3/4 of a full solar rotational time. The EUV reconstructions provide 3D maps of the local emissivity in each of the three coronal EUVI bands, in the range of heights 1.00 to 1.25 Rs. With this information we perform local plasma differential emission measure analysis (LDEM), and compute 3D maps of the electron density and temperature. To identify magnetically open and closed regions, we compute a potential field source surface (PFSS) magnetic extrapolation, driven by MDI/SOHO magnetograms of the same period. We average results in longitude to highlight their large scale component as a function of latitude and height.