Stereoscopic imaging of an Earth-impacting solar coronal mass ejection: A major milestone for the STEREO mission

Details Stereoscopic imaging of an Earth-impacting solar coronal mass ejection: A major milestone for the STEREO mission Stereoscopic imaging of an Earth-impacting solar coronal mass ejection: A major milestone for the STEREO mission

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3608102d&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 8, CiteID L08102

Astronomy and Astrophysics

Astrophysics

41

Space Weather: Solar Effects, Space Weather: Forecasting (2722), Solar Physics, Astrophysics, And Astronomy: Instruments And Techniques, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Planetary Sciences: Fluid Planets: Magnetic Fields And Magnetism

Scientific paper

We present stereoscopic images of an Earth-impacting Coronal Mass Ejection (CME). The CME was imaged by the Heliospheric Imagers onboard the twin STEREO spacecraft during December 2008. The apparent acceleration of the CME is used to provide independent estimates of its speed and direction from the two spacecraft. Three distinct signatures within the CME were all found to be closely Earth-directed. At the time that the CME was predicted to pass the ACE spacecraft, in-situ observations contained a typical CME signature. At Earth, ground-based magnetometer observations showed a small but widespread sudden response to the compression of the geomagnetic cavity at CME impact. In this case, STEREO could have given warning of CME impact at least 24 hours in advance. These stereoscopic observations represent a significant milestone for the STEREO mission and have significant potential for improving operational space weather forecasting.

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