Chromospheric Evaporation in a Remote Solar Flare-like Transient Observed at High Time Resolution with SOHO's CDS and RHESSI

Details Chromospheric Evaporation in a Remote Solar Flare-like Transient Observed at High Time Resolution with SOHO's CDS and RHESSI Chromospheric Evaporation in a Remote Solar Flare-like Transient Observed at High Time Resolution with SOHO's CDS and RHESSI

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...659l..73b&link_type=abstract

The Astrophysical Journal, Volume 659, Issue 1, pp. L73-L76.

Astronomy and Astrophysics

Astronomy

17

Sun: Activity, Sun: Corona, Sun: Flares, Sun: Uv Radiation, Sun: X-Rays, Gamma Rays

Scientific paper

We present EUV light curves and Doppler velocity measurements for a small, remote flarelike transient observed at high time resolution (9.8 s) with SOHO's CDS during a GOES M1.6 solar flare. The EUV observations include a brief precursor and an impulsive peak followed by a more gradual rise and decline of emission. Hard X-ray light curves obtained with RHESSI reveal a small burst just before the EUV impulsive rise, and another burst at the time of the more gradual EUV peak. RHESSI images show no emission at the location of the EUV transient due to limitations in dynamic range. During the impulsive phase we measure simultaneous, cospatial downward velocities ~30 km s-1 in the chromospheric line of He I at 584.3 Å and the transition region line of O V at 629.7 Å, and upward velocities ~20 km s-1 in the coronal line of Si XII at 520.7 Å. Fe XIX emission at 592.2 Å emerged during the impulsive phase and revealed upward velocities approaching 150 km s-1. These observations demonstrate that flarelike explosive chromospheric evaporation occurred at a location remote from the primary region of particle acceleration, apparently driven by electron beams from the primary acceleration region.

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