The winter anomaly at Tromso

Details The winter anomaly at Tromso The winter anomaly at Tromso

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..561f&link_type=abstract

(EISCAT Scientific Association, International EISCAT Workshop, 4th, Sigtuna, Sweden, June 5-9, 1989) Journal of Atmospheric and

Physics

4

Annual Variations, Ionospheric Electron Density, Winter, Eiscat Radar System (Europe), F Region, Ion Temperature, Ionospheric Drift, Solar Activity Effects

Scientific paper

A database of average electron densities at several heights above Tromso, in northern Norway, has been constructed using EISCAT common program data. These data cover more than half a solar cycle, and are binned by height, time of year and time of day. A comparison of the summer and winter electron density variations of any height band above 250 km shows that the F-region winter anomaly exists at Tromso latitudes at solar maximum, as it does at midlatitudes, and that, also like midlatitudes, it is largely absent at solar minimum. However, upon closer examination it is seen that the average daytime electron density maximum is larger a month or so each side of the winter solstice than it is at midwinter, and there, even at solar minimum, this density maximum is anomalously high compared to the summer. This effect is unlikely to be due simply to the variation of solar illumination.

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