First Combined Observations Of Cmes By The Lasco Coronagraphs, Smei And The Stereo Secchi Heliospherical Imagers

Details First Combined Observations Of Cmes By The Lasco Coronagraphs, Smei And The Stereo Secchi Heliospherical Imagers First Combined Observations Of Cmes By The Lasco Coronagraphs, Smei And The Stereo Secchi Heliospherical Imagers

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21011906w&link_type=abstract

American Astronomical Society Meeting 210, #119.06; Bulletin of the American Astronomical Society, Vol. 39, p.244

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the first combined observations of coronal mass ejections (CMEs) observed by the SOHO LASCO and STEREO SECCHI COR-2 coronagraphs, the Coriolis Solar Mass Ejection Imager (SMEI), and the SECCHI Heliospheric Imagers (HIs) on each STEREO spacecraft. STEREO was launched on 25 October 2006 and these observations were obtained during the commissioning phase. All three instruments observe density in the heliosphere via the Thomson scattering process. The LASCO and COR-2 coronagraphs observe the early development of CMEs out to 30 Rs, or about 8o. There are two HI systems on each STEREO spacecraft, HI-1 and HI-2, each with a circular field of view (fov) centered on the ecliptic plane. The HI-1 fov is 10o in radius, begins at 4o elongation, and, thus, overlaps with the LASCO fov. The HI-2 fov is 35o in radius, begins at 18.7o, and overlaps with the HI-1 fov. SMEI is an all-sky imager that detects and tracks CMEs from near the Sun at elongations > 20o to beyond 90o. Thus, the SMEI fov overlaps the outer portion of the HI-1 fov but includes nearly all of the HI-2 fov. The first HI CME observations were made by the HI-1A on 23- 28 Dec. 2006 and showed continued outflows from a limb region. One or more CMEs were observed from the east limb on 24- 25 Jan. 2007 by LASCO and HI-1A, with HI-2A and SMEI observing the outer loops into 26 Jan. We discuss the preliminary analyses of these events, including their kinematic and structural evolution through the fields of these instruments.

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