Line profiles and emission rates of H Lyman-alpha from a hot interstellar/interplanetary gas

Details Line profiles and emission rates of H Lyman-alpha from a hot interstellar/interplanetary gas Line profiles and emission rates of H Lyman-alpha from a hot interstellar/interplanetary gas

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977cosp.meetr....m&link_type=abstract

COSPAR, Plenary Meeting, 20th, Tel Aviv, Israel, June 7-18, 1977, Paper. 8 p.

Astronomy and Astrophysics

Astronomy

Astronomical Spectroscopy, Emission Spectra, High Temperature Gases, Interplanetary Gas, Interstellar Gas, Lyman Alpha Radiation, Astronomical Models, Helium, Hydrogen, Radiation Pressure, Solar Gravitation

Scientific paper

A new model of the interstellar gas near the solar system has been developed to compute the emission line profiles and integrated emission rates from hydrogen (Lyman-alpha at 1216 A) and helium (584 A). Allowance is made for the modification of a Maxwell-Boltzmann velocity distribution by solar gravity, radiation pressure, and charge exchange or photoionization loss processes. For hydrogen, the inequality of radiation pressure and gravitational attraction causes important changes which must be taken into account in the interpretation of line profile measurements.

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