ELF resonant cavities in the geospace as space weather indicators

1Koloskov, AV, 1Sinitsin, VG, 1Gerasimova, NN, 1Yampolski, Yu.M
1Institute of Radio Astronomy of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine
Kosm. nauka tehnol. 2008, 14 ;(5):049-064
https://doi.org/10.15407/knit2008.05.049
Publication Language: Russian
Abstract: 
Ground-based techniques for space weather monitoring rely on measurements of electric and/or magnetic field components in the ground signatures of wave processes in the geospace. The structural formations which can respond to variations of physical conditions in the magnetosphere (and thus become space weather indicators) are the resonant cavities for electromagnetic and MHD waves which exist owing to the non-uniform spatial distribution of the terrestrial plasma. The characteristic time periods shown by wave processes in these cavities fall into the range of ULF and ELF waves. We consider the frequency, amplitude and polarization parameters of the wave fields in the magnetospheric resonator, the ionospheric Alfven resonator and the cavity between the Earth and the ionosphere, varying under the impact of geomagnetic field disturbances and solar proton events. A theoretical model is developed for the coupling of Alfven wave resonators in the ionosphere and magnetosphere.
Keywords: geomagnetic field, resonators, solar proton events
References: 
1. Belyaev P. P., Polyakov S. V., Rapoport V. O., Trakhtengerts V. Yu. Experimental study of the resonant structure of the atmospheric electromagnetic noise spectrum at short-period geomagnetic pulsations: Preprint NIRFI No. 230. (Gorky, 1987) [in Russian].
2. Zalizovski A. V., Yampolski Yu. M., Korepanov V. E., Dotsenko I. F.  Polarization Effects of Pc3, Pc4 Geomagnetic Pulsations Observed at Vernadsky Antarctic Station (“the Sunflower Effect”). Radio Physics and Radio Astronomy, 5 (2), 118 —124 (2000) [in Russian].
3. Research of Global Resonators as Indicators of the State of Space Weather: Research Report, Institute of Radio Astronomy of the NAS of Ukraine, No of State Registration 0105U007345. (Kharkiv, 2006).
4. Leonovich A. S., Mazur V. A. Dynamics of small-scale Alfven waves in a magnetospheric resonator. Fizika Plazmy, 13 (7), 800—810 (1987) [in Russian].
5. Lyatsky V. B., Maltsev Yu. P. Magnetosphere-Ionosphere Coupling, 192 p. (Moscow, Nauka, 1983) [in Russian].
6. Rudenko G. V. Numerical study of the Alfven resonator in the ionosphere. Izv. vuzov. Radiofizika, 33 (2), 155—163 (1990) [in Russian].
7. Sinitsyn V.G. Hertz potentials for an inhomogeneous medium. Radiotekhnika i  Elektronika, 37 (9), 1537—1543 (1992) [in Russian].
8. Belyaev P. P., Bosinger T., Isaev S. V., Kangas J. First evidence at high latitude for the ionospheric Alfven resonator. J. Geophys. Res., 104, 4305 (1999).
https://doi.org/10.1029/1998JA900062
9. Berkman R., Korepanov V., Bondaruk B. In: Proceedings of XIV IMEKO World Congress, Vol. IVA, 121 — 126 (Tampere, Finland, 1997).
10. Hanson W. B. Structure of the ionosphere. In: Johnson F. S. (Ed.) Satellite Environment Handbook, 192 p. (Stanford Univ. Press, Calif., 1965).
11. Kivelson M. G., Southwood D. J. Coupling of global magnetospheric MHD eigenmodes to field line resonances. J. Geophys. Res., 91, 4345 (1986).
https://doi.org/10.1029/JA091iA04p04345
12. Lysak R. L. Feedback instability of the ionospheric resonant cavity. J. Geophys. Res., 96 (A2), 1553— 1568 (1991).
https://doi.org/10.1029/90JA02154
13. Nisbet A. In: Proceedings of the Royal Society of London, A240 (1222), 375 (1957).
https://doi.org/10.1098/rspa.1957.0092

14. Sinitsin V. G., Yampolski Y. M., Zalizovski A. V., et al. Spatial field structure and polarization of geomagnetic pulsations in conjugate areas. J. Atmos. Solar-Terr. Phys., 65, 1161 — 1167 (2003).