Ionospheric foF2 variability over the Southeast Asian sector

Details Ionospheric foF2 variability over the Southeast Asian sector Ionospheric foF2 variability over the Southeast Asian sector

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11509329a&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A9, CiteID A09329

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2

Ionosphere: Ionospheric Dynamics, Ionosphere: Electric Fields (2712), Ionosphere: Ionosphere/Atmosphere Interactions (0335)

Scientific paper

This paper presents the diurnal, seasonal, and solar activity impacts on the variability of ionospheric foF2 over the Southeast Asian sector. Data from three ionosonde stations, namely, Manila (14.7°N, 121.1°E, dip 14.7°N), Okinawa (26.3°N, 127.8°E, dip 36.8°N), and Vanimo (2.7°S, 141.3°E, dip 22.5°S), were used for the investigation via the standard deviation approach. The diurnal analysis revealed that foF2 is more susceptible to variability during the nighttime than the daytime. The observed variability is characterized by two peaks: a postsunset peak (15%-50% corresponding to 3-14 MHz for the mean foF2 values) and a postmidnight peak (18%-68% corresponding to 2-9 MHz for the mean foF2 values). Seasonally, the trend of the foF2 variability maximum does not follow any typical pattern (no particular season has a leading edge over others) for all levels of solar activity. On average the foF2 variability maximum was observed at the Vanimo station during low- and high-solar-activity years (1986 and 1989, respectively). During the moderate-solar-activity year (1983), the foF2 variability maximum was observed at the Manila station. With the exception of the Okinawa data, where little or no difference in the foF2 variability peaks during the low- and moderate-solar-activity years was noticed, foF2 variability increases with decreasing solar activity at all stations.

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