Rapid variations in the sporadic-E region

Details Rapid variations in the sporadic-E region Rapid variations in the sporadic-E region

Sep 1962

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..753h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 9, pp. 753-754, IN1-IN2, 755-764

Physics

2

Scientific paper

Ionograms taken every 7.8 sec have been analysed to see how rapidly the sporadic-E parameters, [latin small letter f with hook]0Es and [latin small letter f with hook]bEs, change with time. Normal echo fading causes changes of up to ~0.1 Mc/s from one record to the next; the structure of the sporadic-E clouds leads to a slower variation with a quasi-period of about 1 hr, and amplitude of the order of 0.5 Mc/s. Averaged over 2 min, [latin small letter f with hook]0Es and [latin small letter f with hook]bEs have root mean square rates of change of 0.1 Mc/s per min. [latin small letter f with hook]0Es increases a few minutes before and decreases a few minutes after corresponding increases and decreases of [latin small letter f with hook]bEsE On two occasions a decrease in [latin small letter f with hook]0Es results from a break-up of the trace on the ionogram rather than a steady decrease. It is possible that these two effects are the result of diffraction from the edges of ionization clouds and from a small cloud respectively.

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