Types of ionospheric scintillations in southern mid-latitudes during the last sunspot maximum

Details Types of ionospheric scintillations in southern mid-latitudes during the last sunspot maximum Types of ionospheric scintillations in southern mid-latitudes during the last sunspot maximum

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56..391h&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 3, p. 391-399

Physics

4

Annual Variations, Atmospheric Physics, Atmospherics, Earth Atmosphere, Polar Orbits, Radio Beacons, Radio Transmission, Satellite Transmission, Scintillation, Solar Activity Effects, Sunspot Cycle, Sunspots, Australia, Classifications, Correlation, Graphs (Charts), Tables (Data)

Scientific paper

A 5-yr study (1987-1992) has been undertaken at a southern mid-latitude station, Brisbane (35.6 deg S invariant latitude) on scintillation occurrences in radio-satellite transmission (at a frequency of 150 MHz) from polar orbit Transit satellites, within a sub-ionospheric invariant latitude range 20-55 deg S. Over 7000 recorded passes were used to define the spatial and temporal occurrence pattern of different types of scintillation events. Two predominant scintillation types were found: so-called type P (associated with a scintillation patch close to the magnetic zenith) and type S (characteristic of the equatorward edge of auroral scintillation oval). Type S was by far the most frequent during sunspot maximum (1988-1992), with sharp occurrence peaks in the summer-autumn period. Its seasonal occurrence showed a high degree of correlation (correlation coefficient r = 0.8) with the seasonally averaged 10.7 cm solar radio flux. This type occurred mainly at night-time except in austral summer where 40% of scintillations were detected in daytime, coinciding with the well-known summer peak of sporadic-E occurrence. Type P was more predominant during a year (1987) of ascending sunspot activity but decreased to a much lower level during the sunspot maximum.

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