On nighttime anomalous enhancement in ionospheric electron content at lower mid-latitude during solar maximum

Details On nighttime anomalous enhancement in ionospheric electron content at lower mid-latitude during solar maximum On nighttime anomalous enhancement in ionospheric electron content at lower mid-latitude during solar maximum

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8...53j&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 8, Jan. 1990, p. 53-57.

Physics

9

Ionospheric Disturbances, Ionospheric Electron Density, Solar Terrestrial Interactions, Equinoxes, Night, Sunspots, Temporal Distribution

Scientific paper

The total electron content data derived from measurements of the Faraday rotation of 136 MHz signals at Tokyo (35.71 deg N, 139.49 deg N) from ETS II at 130 deg E form the data base for the study of various characteristics of nighttime anomalous enhancements in ionospheric electron content during the high sunspot years 1978 and 1979. The measurements correspond to a 300 km subionospheric point of 33.46 deg N, 138.72 deg N geographic latitude, and geomagnetic latitude of 23.16 deg N. The results are compared with those previously obtained for a low latitude Hawaiian station and with a few high latitude stations. The salient characteristics from the study are: (1) the nighttime enhancements occur mainly at post-midnight hours and in summer and equinox seasons, (2) the occurrence increases with sunspot activity, (3) the most probable amplitudes are 0.3 and 0.5 x 10 to the 17 per sq m, while the most probable durations are 180 and 90 min for post and pre-midnight cases, respectively, (4) both the mean amplitude and duration of pre-midnight events show semi-annual variation with equinoxial maxima, while those of post-midnight events show annual variation with summer maximum, and (5) the amplitude of the enhancements has a significant positive correlation with both background content and daytime peak content.

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