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Infrared Spectroscopic Observations of Neutral Helium During the 1994 Eclipse

Published online by Cambridge University Press:  27 February 2018

I. Mann ,
J. R. Kuhn  and
M. J. Penn
I. Mann
Affiliation:
Max-Planck-Institut für Aeronomie, Postfach 20, D-37189 Katlenburg-Lindau, Germany
J. R. Kuhn
Affiliation:
National Solar Observatory, P. 0. Box 62, Sunspot, NM 88349, USA
M. J. Penn
Affiliation:
National Solar Observatory, P. 0. Box 62, Sunspot, NM 88349, USA

Abstract

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We present the detection of a neutral helium line in observations of the solar corona obtained during the 1994 eclipse, and show that a coronal excitation process is unlikely to cause such a significant Hel emission that extends out to a distance of 3 solar radii (R⊙) from the center of the sun. Besides the scattered light of a solar prominence, as well as components of geocoronal helium, the observed emission line may come from the neutral helium components in the interplanetary medium. Recombination of ions on interplanetary dust particles may play a role for the formation of the neutral helium.

Type
IX. Zodiacal Light and Thermal Emission
Information
International Astronomical Union Colloquium , Volume 150: Physics, Chemistry and Dynamics of Interplanetary Dust , 1996 , pp. 345 - 348
Copyright
Copyright © Astronomical Society of the Pacific 1996

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