Can cool loop flows explain transition region redshifts

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/185604· OSTI ID:6966906

Mcclymont, A N ^[1]

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1. Hawaii Univ., Honolulu (USA)

Observations of solar active regions reveal extensive areas of redshifted emission lines in the extreme ultraviolet, indicative of down flowing plasma. Redshifts are seen also in the magnetic network of the quiet sun and in magnetically active stars. The inferred velocities are large and appear to represent steady flows. Redshifts are not observed at higher coronal temperatures. It is shown here that steady flow in cool loops driven by the buoyancy force set up by a small heating asymmetry between the two legs of the loop, offers a possible theoretical explanation of the observed features. 27 refs.

• OSTI ID: 6966906
• Journal Information: Astrophysical Journal; (USA), Vol. 347; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
EMISSION SPECTRA
RED SHIFT
SOLAR ACTIVITY
EXTREME ULTRAVIOLET RADIATION
MAGNETIC FIELDS
MAGNETIC STARS
SOLAR ATMOSPHERE
SOLAR CORONA
STEADY FLOW
TEMPERATURE DISTRIBUTION
VELOCITY
ATMOSPHERES
ELECTROMAGNETIC RADIATION
FLUID FLOW
RADIATIONS
SPECTRA
STARS
STELLAR ATMOSPHERES
STELLAR CORONAE
ULTRAVIOLET RADIATION
640104* - Astrophysics & Cosmology- Solar Phenomena