Published August 1977 | Version v1
Journal article Metadata-only

A measurement of the helium D3 profile with a birefringent filter

Creators

  • 1. Hale Observatories, Pasadena, Calif. (USA)

Description

The D3 line profile in plages on the disk is measured using a birefringent filter. The best fit Gaussian has a 1/e width of 0.4 A, with negligible instrumental contribution. The D3 opacity is produced in regions with thermal linewidth approximately = 0.1 A; the much larger observed width indicates large non-thermal motions in the chromosphere. (Auth.)

Additional details

Identifiers

DOI
10.1007/bf00160280;

Publishing Information

Journal Title
Solar Physics
Journal Volume
53
Journal Issue
2
Series
Sol. Phys.
Journal Page Range
369-374
ISSN
0038-0938

INIS

Country of Publication
Netherlands
Country of Input or Organization
Netherlands
INIS RN
9353693
Subject category
S79: ASTROPHYSICS, COSMOLOGY AND ASTRONOMY;
Descriptors DEI
ABSORPTION SPECTRA; BRIGHTNESS; CHROMOSPHERE; GAUSS FUNCTION; HELIUM; LINE WIDTHS; OPACITY; PLAGES; SUN; VISIBLE RADIATION
Descriptors DEC
ELECTROMAGNETIC RADIATION; ELEMENTS; FUNCTIONS; NONMETALS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; RADIATIONS; RARE GASES; SOLAR ACTIVITY; SPECTRA; STARS

Optional Information

Notes
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