Equatorial spread-F - Recent results and outstanding problems

Details Equatorial spread-F - Recent results and outstanding problems Equatorial spread-F - Recent results and outstanding problems

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jatp...47..745k&link_type=abstract

(IUGG, IAGA, USAF, et al., International Symposium on Equatorial Aeronomy, 7th, Hong Kong, Mar. 22-29, 1984) Journal of Atmosphe

Physics

45

Equatorial Atmosphere, Ionospheric Disturbances, Spread F, Atmospheric Turbulence, Ionospheric Electron Density, Plasma Density, Radar Measurement, Space Plasmas, Vertical Distribution

Scientific paper

Recent results and outstanding problems in the field of equatorial spread-F are reviewed. The discussion is organized about four distinct wavelength regimes: long (greater than or approximately equal to 20 km), intermediate (20 km-100 m), transitional (100 m-10 m), and short (less than or approximately equal to 10 m). The intermediate waves are best understood, although the enhanced turbulent power near 1 km wavelength needs explanation, as does the saturation mechanism itself. The role of shear flow and irregularity seeding by 'geophysical noise' in the neutral atmosphere form important future research topics at the longest scales. Identification of drift waves in the transitional wavelength range has been a major new step in explaining the full spread-F phenomenon. This drift wave turbulence in the transition regime will be actively studied in the near future, particularly with regard to its role in determining the saturated amplitude of the intermediate waves, as well as in the anomalous diffusion of plasma at high altitudes. Although waves as short as 11 cm have been unambiguously detected and linear theories exist, the origin and amplitude spectra of these short wavelength waves inside topside plumes remain in some doubt and should also be explained in more detail.

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