On the Accuracy of the Conjugation of High-Orbit Satellites with Small-Scale Regions in the Ionosphere
The degree of uncertainty that arises when mapping high-orbit satellites of the Cluster type into the ionosphere using three geomagnetic field models (T89, T98, and T01) has been estimated. Studies have shown that uncertainty is minimal in situations when a satellite in the daytime is above the equatorial plane of the magnetosphere at the distance of no more than 5 RE from the Earth’s surface and is projected into the ionosphere of the northern hemisphere. In this case, the dimensions of the uncertainty region are about 50 km, and the arbitrariness of the choice of the model for projecting does not play a decisive role in organizing satellite support based on optical observations when studying such large-scale phenomena as, e.g., WTS, as well as heating experiments at the EISCAT heating facility for the artificial modification of the ionosphere and the generation of artificial fluctuations in the VLF band. In all other cases, the uncertainty in determining the position of the base of the field line on which the satellite is located is large, and additional information is required to correctly compare the satellite with the object in the ionosphere.
Unable to display preview. Download preview PDF.
- 3.Wright, D.M., Davies, J.A., Yeoman, T.K., et al., Detection of artificially generated ULF waves by the FAST spacecraft and its application to the “tagging” of narrow flux tubes, J. Geophys. Res., 2003, vol. 108, 1090. doi 10.1029/2002JA009483Google Scholar
- 6.Golovchanskaya, I.V., Kornilov, I.A., and Kornilova, T.A., East–west type precursor activity prior to the auroral onset: Ground-based and THEMIS observations, J. Geophys. Res., 2015, vol. 120. doi 10.1002/ 2014JA020081Google Scholar
- 18.Tsyganenko, N.A., A model of the near magnetosphere with a dawn–dusk asymmetry. 2. Parameterization and fitting to observations, J. Geophys. Res., 2002, vol. 107, no. A8. doi 10.1029/2001JA000220Google Scholar