Studies of seasonal behaviour of the shape of mesospheric scatterers using a 1.98 MHz radar

Details Studies of seasonal behaviour of the shape of mesospheric scatterers using a 1.98 MHz radar Studies of seasonal behaviour of the shape of mesospheric scatterers using a 1.98 MHz radar

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..295l&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Mar.-Apr. 1992, p. 295-303, 305-309.

Physics

10

Atmospheric Scattering, Brunt-Vaisala Frequency, Ionospheric Electron Density, Mesosphere, Radar Data, Annual Variations, Doppler Effect, Gravity Waves, Traveling Ionospheric Disturbances

Scientific paper

Seasonal behavior of the aspect sensitivity of mesospheric scatterers at a frequency of 2 MHz in the region of 70-98 km is studied using three independent techniques. Two techniques show that there exists a definite seasonal variation in the aspect sensitivity, with minima occurring in the Southwest Hemisphere winter, and maxima in the summer. These are both techniques which are sensitive to the most oblate scatterers. The third technique, which involves comparisons of a vertical and an off-vertical beam and is sensitive to more isotropic scatters, does not show any seasonal behavior. These results support the notion of at least two distinct types of scatterers coexisting in the mesosphere. Furthermore, it is shown that aspect sensitivity can be used to estimate the length-to-depth ratio of the oblate scatterers, with this also showing definite behavior. It is emphasized that these are statistical results, accumulated using large data sets, and the existence of occasional highly aspect-sensitive scatter (far more aspect sensitive than the mean results reported) cannot be ruled out. However, the descriptions discussed apply for the majority of the time.

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