Observations of a Two-stage Solar Eruptive Event (SEE): Evidence for Secondary Heating

Details Observations of a Two-stage Solar Eruptive Event (SEE): Evidence for Secondary Heating Observations of a Two-stage Solar Eruptive Event (SEE): Evidence for Secondary Heating

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012apj...746l...5s&link_type=abstract

The Astrophysical Journal Letters, Volume 746, Issue 1, article id. L5 (2012).

Astronomy and Astrophysics

Astronomy

1

Sun: Coronal Mass Ejections: Cmes, Sun: Flares, Sun: Uv Radiation, Sun: X-Rays, Gamma Rays

Scientific paper

We present RHESSI, SDO/AIA, SOHO/LASCO, STEREO, and GOES observations of a partially occulted solar eruptive event that occurred at the southwest limb on 2011 March 8. The GOES X-ray light curve shows two peaks separated by almost 2 hr that we interpret as two stages of a single event associated with the delayed eruption of a coronal mass ejection (CME). A hot flux rope formed during the first stage and continued expanding and rising throughout the event. The speed of the flux rope decreased from ~120 to 14 km s-1 during the decay phase of the first stage and increased again during the second stage to become the CME with a speed of ~516 km s-1. RHESSI and GOES data analyses show that the plasma temperature reached over 20 MK in the first stage, then decreased to ~10 MK and increased to 15 MK in the second stage. This event provides clear evidence for a secondary heating phase. The enhanced EUV and X-ray emission came from the high corona (~60 arcsec above the limb) in the second stage, ~40 arcsec higher than the site of the initial flare emission. STEREO-A on-disk observations indicate that the post-flare loops during this stage were of larger scale sizes and spatially distinct from those in the first stage.

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