IRI critical frequency of F2-layer in comparison with experimental and calculated values for East Siberia region
Abstract
International Reference Ionosphere allows determining the ionosphere parameters in every point of the Earth at any time. Obtained averaged values of ionospheric parameters can totally differ from the real values, especially on the Russia territory. Comparison with IRI shows that latitude gradients between critical frequencies at midpoint of Magadan-Irkutsk path (58.2N, 124.2E) and at Yakutsk (62N, 129.6E) larger than IRI expects. Differences speak that IRI describes ionosphere in this region (East Siberian high and middle latitudes) not too well. The work based on the chirp-ionosounder observations during 2005-2006 in Irkutsk (52N, 104E) over Magadan-Irkutsk path (path length 3034 km) and during 1989 in Aldan (58.48N, 125.24E) near the path' midpoint. In the work operative technique for critical frequency value calculation (in the oblique-incidence path' midpoint) was used. The IRI data and experimental vertical-incidence data (nearest to path's midpoint) were used for validation of calculated values. Experimental oblique sounding data recalculation into the path's midpoint parameters was performed on the basis of the modified Smith method without consideration of Earth's magnetic field. The operative technique of F2-layer parameter definition have satisfying accuracy, and its simple algorithm opens good perspectives for using the technique in real-time for operative diagnostics. Oblique incidence data recalculation into F2-layer parameters at the path' midpoint can be useful as an opportunity to obtain additional information of environment in regions where the ionospheric stations are absent. We need only the presence of true experimental oblique incidence data and a possibility of the 1F2 mode upper ray parameters obtaining. Besides diagnostics it can be useful for short-term forecasting in development of regional ionosphere models, for adapting and correcting of different ionosphere references to real conditions. The work was partly supported by Russian Foundation for Basic Research (grant N 08-05- 00274).
- Publication:
-
37th COSPAR Scientific Assembly
- Pub Date:
- 2008
- Bibcode:
- 2008cosp...37.1512K