A feasibility study of two interactive experiments with an OH cometary coma

Details A feasibility study of two interactive experiments with an OH cometary coma A feasibility study of two interactive experiments with an OH cometary coma

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...163..287p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 163, no. 1-2, July 1986, p. 287-296.

Astronomy and Astrophysics

Astrophysics

1

Comets, Feasibility Analysis, Hydroxyl Emission, Masers, Population Inversion, Space Observations (From Earth), Spaceborne Experiments, Zeeman Effect

Scientific paper

Consideration is given to two interactive experiments which could be performed on a cometary OH maser. The first one consists of emitting a powerful radiosignal at OH frequency from the earth to quench the maser in a narrow frequency band. Thus it is possible to measure the OH rest frequency with a better accuracy than presently known, the maser pump rate which is still an estimate, the magnetic field intensity and a rough picture of its spatial distribution in the cometary head. It is shown, however, that all these results will only be marginal with present techniques and will need a large power emitter (200 kW). The second one is based on the earth-based observation of the same signal emitted from a spacecraft flying into or behind the OH comet atmosphere and amplified by the maser. It is then shown that a precise map of the velocity and density of the OH molecules can be obtained. Eventually it is shown that the combination of both experiments would yield all these results together with high efficiency and a small ground-based power emitter (20 kW). High quality data return is expected.

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