Computer Science – Sound
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994adspr..14q..61n&link_type=abstract
Advances in Space Research, Vol. 14, No. 4, p. 61 - 64
Computer Science
Sound
Sunspots: Mass Flow, Solar Corona: Velocity Fields
Scientific paper
An extreme ultraviolet imaging spectrograph designed for sounding rocket flight has been used to search for velocity fields in the low solar corona. During a flight in May, 1989, the authors obtained emission line profile measurements along a chord through an active region on the Sun. Relative Doppler velocities were measured in emission lines of Mg IX, Fe XV, and Fe XVI with a sensitivity of 2 - 3 km s-1 at 350 A. The only Doppler shift appreciably greater than this level was observed in the line of Mg IX at 368.1 A over the umbra of the large sunspot. The maximum shift measured at that location corresponded to a velocity toward the observer of 14±3 km s-1 relative to the mean of measurements in that emission line made elsewhere over the active region. The magnetic field in the low corona was aligned to within 10° of the line of sight at the location of maximum Doppler shift. Depending on the magnetic field geometry, this mass outflow could either re-appear as a downflow of material in distant footpoints of closed coronal loops or, if along open field lines, could contribute to the solar wind.
Brosius Jeffrey W.
Neupert Werner M.
Thomas Robert J.
Thompson William T.
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