Dynamical effects in the distribution of helium in the thermosphere

Details Dynamical effects in the distribution of helium in the thermosphere Dynamical effects in the distribution of helium in the thermosphere

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38..829r&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 38, Aug. 1976, p. 829-840.

Physics

Atmospheric Circulation, Atmospheric Heat Budget, Helium, Thermosphere, Wind Effects, Abundance, Annual Variations, Diurnal Variations, Latitude, Magnetic Storms

Scientific paper

The paper discusses some phenomena, mainly observed by satellites, which illustrate the use of helium as a tracer for studying the morphology and history of atmospheric responses to energy inputs of varying amplitudes and durations. The effects observed include (1) the annual north-south excursion of the sub-solar point producing the winter helium bulge, (2) the 24-hour diurnal variation, where the helium density peak is phase-shifted to the morning in the lower thermosphere, (3) high latitude magnetospheric heating of the thermosphere, with helium indicating regions of probable upwelling of the heated gas, and (4) gravity wave formation and propagation, with the attendant implications for transport of energy from one region of the atmosphere to another.

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