Other
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ang....32..203r&link_type=abstract
Annales de Geophysique, vol. 32, July-Sept. 1976, p. 203-213.
Other
Backscattering, E Region, Equatorial Electrojet, Ionospheric Disturbances, Magnetic Equator, Short Wave Radio Transmission, Very High Frequencies, Diurnal Variations, Hysteresis, Ionospheric Electron Density
Scientific paper
It is shown that the forward scatter signal strength of VHF radio waves from the equatorial electrojet irregularities is proportional to delta H at the equatorial station minus delta H at the low latitude station outside the equatorial jet. The hysteresis in signal strength versus delta H (equatorial) is removed when delta H equatorial-delta H non-equatorial is used to estimate the electrojet current strength provided care is taken to avoid the effects of solar flares and other irregularities. A new type of asymmetric irregularities at 100 km is identified which give rise to the M(2F-Es) echoes. The occurrence of these echoes in the evening hours causes a slight enhancement of the scatter signal strength in the afternoon hours. These irregularities are suggested to have comparatively sharper electron density gradient on the topside as compared to the bottomside and occur when the electrojet currents are comparatively weaker.
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