Absorption feature observed on the H Lyman-alpha solar line - an interpretation

Details Absorption feature observed on the H Lyman-alpha solar line - an interpretation Absorption feature observed on the H Lyman-alpha solar line - an interpretation

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100..205a&link_type=abstract

Astronomy and Astrophysics, vol. 100, no. 1, July 1981, p. 205-208.

Astronomy and Astrophysics

Astrophysics

Absorption Spectra, H Lines, Hydrogen Atoms, Interplanetary Gas, Lyman Alpha Radiation, Solar Spectra, Spectrum Analysis, Annual Variations, Astronomical Models, Geocoronal Emissions, Line Spectra, Red Shift, Solar Activity Effects

Scientific paper

A narrow absorption feature on the red part of the solar H Lyman-alpha profile has been observed by two instruments in 1975 and attributed to atomic hydrogen of the nearby interplanetary gas. This hypothesis implies that the absorption feature shifts with the position of the earth on its orbit. New measurements above active regions at other seasons rule out this hypothesis. On the other hand, appropriate laboratory calibrations indicate that the absorption feature is likely due to a ghost image of the geocoronal absorption.

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