Theory of equatorial sporadic-E

Details Theory of equatorial sporadic-E Theory of equatorial sporadic-E

Mar 1963

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963jatp...25..167w&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 25, no. 3, pp. 167-173

Physics

4

Scientific paper

It is shown that when sound waves travel at right angles to the magnetic field in the lower E-region near the earth's magnetic equator, marked build up of electron density irregularities is possible. The theory indicates that whilst the electron density irregularities may be much more intense than the corresponding air density variations, they are nevertheless related and no instability process leading to strong irregularities is required. Thus the irregularities may result in only weak scattering of radio waves, as is observed. The irregularities tend to form at a rather definite height near the magnetic equator, and are strongly dependent on the magnitude of the equatorial electrojet current. The minimum transverse size of irregularities is a few metres and they move at right angles to the magnetic field with the velocity of sound. All these properties appear to be in accord with observation and strongly suggest that this is the means by which equatorial sporadic-E is produced.

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