Astronomy and Astrophysics – Astronomy
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spd....28.1303p&link_type=abstract
American Astronomical Society, SPD meeting #28, #13.03; Bulletin of the American Astronomical Society, Vol. 29, p.917
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Several types of flows are observed in the quiet solar chromosphere using the He I 1083 nm absorption line with data from the NSO/KPVT. Downflow events, termed ``He Rain'' are described by about 4 km/sec Doppler red-shift of the line, an increased line width, and enhanced line absorption. The ``He Rain'' events begin with a small, compact morphology then evolve during 500 seconds to become extended and diffuse. The birth-rate of these ``He Rain'' events suggests an association with either coronal loop interactions or macrospicules. Loop-flow events observed with the He I 1083 nm line show blue-shifts followed by a red-shift, an increased line width and enhanced line absorption. The events follow curving trajectories with sizes about 30 arcsec. These events occur much less frequently than spicules, but may be associated with a type of spicule or some flow along the local magnetic field. Recent observations of these quiet Sun events and discussion of the associated coronal events will be presented.
Jones Philip H.
Penn Matt J.
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