An analytic formulation for heating source memory in the thermospheric composition

Details An analytic formulation for heating source memory in the thermospheric composition An analytic formulation for heating source memory in the thermospheric composition

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.3555p&link_type=abstract

Journal of Geophysical Research, vol. 86, May 1, 1981, p. 3555-3560.

Physics

8

Atmospheric Composition, Atmospheric Energy Sources, Atmospheric Models, Magnetic Storms, Thermosphere, Time Lag, Atmospheric Heating, Atmospheric Physics, Fourier Series, Fourier Transformation, Green'S Functions, Time Response, Vertical Distribution

Scientific paper

Numerical calculations from a spectral circulation model are utilized to construct an analytic Green's function formulation describing the meridional, time-dependent thermospheric composition and temperature response during magnetic storms. The purpose is to develop a formulation that embodies source memory while being sufficiently simple to serve as a heuristic guide for empirical modeling. By passing from the discrete Fourier series representation, utilized for the numerical circulation model, to a continuous Fourier integral representation, explicit waves are obtained for the thermospheric response times. The response times are altitude and species dependent and can exceed two days below 200 km. Thus, for certain storm scenarios, pronounced source memory signatures for the composition and temperature are predicted. Response times obtained from the formulation are shown to give a response consistent with previously published neutral composition data from AE-C for the February 1974 storm when an ap dependent heat source is employed.

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