First Measurements of the Mass of Coronal Mass Ejections from the EUV Dimming Observed with Stereo EUVI A and B Spacecraft

Details First Measurements of the Mass of Coronal Mass Ejections from the EUV Dimming Observed with Stereo EUVI A and B Spacecraft First Measurements of the Mass of Coronal Mass Ejections from the EUV Dimming Observed with Stereo EUVI A and B Spacecraft

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.2116a&link_type=abstract

American Astronomical Society, SPD meeting #40, #21.16; Bulletin of the American Astronomical Society, Vol. 41, p.857

Astronomy and Astrophysics

Astronomy

Scientific paper

The masses of Coronal Mass Ejections (CMEs) have traditionally been determined from white-light coronagraphs, based on the Thomson scattering of electrons. Here we develop a new method of measuring CME masses from the EUV dimming seen with EUV imaging telescopes in multiple temperature filters. As a test we compare the CME masses measured by STEREO/EUVI A and B with those previously determined by STEREO/COR2, for a set of 8 CME events of which we detected 7 with EUVI and determined the masses in 6 cases. We find CME masses in the range of m = (2-7) x 10(15) g. The agreement between the two EUVI/A and B spacecraft is mA/mB =1.3 +/- 0.6 and the consistency with white-light measurements by COR2 is mEUVI/mCOR2 = 1.1 +/- 0.3. The consistency between EUVI and COR2 implies no significant mass backflows (or inflows) at r < 4 R and adequate temperature coverage for the bulk of the CME mass in the range of T = 0.5-3.0 MK. The temporal evolution of the EUV dimming allows us also to model the evolution of the CME density, volume, height-time, and propagation speed in terms of an adiabatically expanding self-similar geometry. We test this model with the predicted detection delay between EUVI and COR2 for the 2008-Mar-25 event.

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