Search for Velocity Signatures of Energy Release in Fine Scale Coronal Features

Details Search for Velocity Signatures of Energy Release in Fine Scale Coronal Features Search for Velocity Signatures of Energy Release in Fine Scale Coronal Features

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spd....28.0119c&link_type=abstract

American Astronomical Society, SPD meeting #28, #01.19; Bulletin of the American Astronomical Society, Vol. 29, p.882

Astronomy and Astrophysics

Astronomy

Scientific paper

The Large Angle Spectrometric Coronagraph (LASCO) on the SOHO satellite consists of three individual coronagraphs with nested fields of view. The innermost C1 coronagraph observes the solar corona from 1.1 to 3.0 R_&sun;, and contains a Fabry Perot interferometer which can image the corona in the 1.8 million K Fe XIV emission line at 5303 Angstroms with 0.7 Angstroms resolution. We designed an observing program with reduced spatial coverage and reduced profile coverage at only three wavelengths (line center and the half power points of the thermal plus instrumental profile) in order to increase the observing cadence. From these observations we can construct maps of the observed field in integrated line intensity, doppler velocity shift, and nonthermal broadening. We can thus search for signatures of coronal heating such as transient brightenings, bulk velocity flows, or nonthermal turbulent line broadening at spatial scales down to 11 arc sec (two CCD pixels), with temporal resolution of 4 minutes. We have run this program several times so far, and will report on early results.

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