Time and spatial variations in the ratio of nighttime and daytime critical frequencies of the F2 layer

Details Time and spatial variations in the ratio of nighttime and daytime critical frequencies of the F2 layer Time and spatial variations in the ratio of nighttime and daytime critical frequencies of the F2 layer

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jastp..70.1201d&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, vol. 70, issue 8-9, pp. 1201-1212

Physics

7

Ionosphere, Long-Term Trends, Thermospheric Circulation

Scientific paper

The ratio of daytime and nighttime values of the foF2 critical frequency is analyzed on the basis of the data of 28 ionospheric stations of the Eastern Hemisphere. It is found that after about 1980, three types of behaviors of this ratio with time are observed: an increase with time (a positive trend), a decrease with time (a negative trend) and the absence of pronounced changes (a zero trend). The sign of this trend is shown to be governed by the signs of the magnetic declination D and magnetic inclination I at the given ionospheric station. This fact makes it possible to assume that the above-indicated trend is caused by long-term variations in the zonal component Vny of the horizontal wind in the thermosphere, the latter component contributing into the vertical drift velocity W. The causes of the systematic changes in the thermospheric circulation regime after 1980 are not yet known.

Affiliated with

Also associated with

No associations

Rating

Time and spatial variations in the ratio of nighttime and daytime critical frequencies of the F2 layer does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Time and spatial variations in the ratio of nighttime and daytime critical frequencies of the F2 layer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Time and spatial variations in the ratio of nighttime and daytime critical frequencies of the F2 layer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1570495