Abstract
Specific variations in the critical frequency of the ionospheric F 2 layer during magnetospheric substorms have been found based on the data of vertical sounding stations in Europe and North America. Maximal attention has been paid to the positive peaks of ΔfoF2 with a duration of 6–8 h before the beginning of the substorm expansion phase (T 0). The possible physical mechanisms by which these peaks are formed (related to the impact of fast particles in the foreshock region of the solar wind on the Earth’s magnetosphere and different for middle and high latitudes) have been considered. The positive peaks of ΔfoF2 can be used in a short-term prediction of the ionospheric disturbance onset and space weather on the whole.
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References
R. Bauske, S. Noel, and G. W. Pröss, “Ionospheric Storm Effects in the Nighttime E Region Caused by Neutralized Ring Current Particles,” Ann. Geophys. 15(7), 300–305 (1997).
D. V. Blagoveshchensky, T. D. Borisova, and L. V. Egorova, “Pre- and Poststorm Situations in the Ionosphere and Propagation of Decameter Radiowaves,” Geomagn. Aeron. 36(4), 125–134 (1996) [Geomagn. Aeron. 36, 508–514 (1996)].
D. V. Blagoveshchensky and T. D. Borisova, “Substorm Effects of Ionosphere and HF Propagation,” Radio Sci. 35(5), 1165–1171 (2000).
D. V. Blagoveshchensky, J. W. MacDougall, and A. V. Piatkova, “Ionospheric Effects Preceding the October 2003 Halloween Storm,” J. Atmos. Sol.-Terr. Phys. 68(11), 821–831 (2006).
D. V. Blagoveshchensky, L. V. Egorova, and V. M. Lukashkin, “High-Latitude Ionospheric Phenomena Diagnostics by High-Frequency Radio Wave Propagation Observations,” Radio Sci. 27(3), 267–274 (1992).
D. V. Blagoveshchensky, O. A. Maltseva, and A. S. Rodger, “Ionosphere Dynamics over Europe and Western Asia during Magnetospheric Substorms 1998–1999,” Ann. Geophys. 21(7), 1141–1151 (2003).
M. J. Buonsanto, “Ionospheric Storms—a Review,” Space Sci. Rev. 88, 563–601 (1999).
A. D. Danilov and L. D. Morozova, “Thermosphere-Ionosphere Coupling during Ionospheric Storms: A Review,” Geomagn. Aeron. 31(2), 209–222 (1991).
A. D. Danilov, L. D. Morozova, and E. G. Mirmovich, “On the Possible Nature of the Ionospheric Storm Positive Phase,” Geomagn. Aeron. 25(5), 768–772 (1985).
J. C. Foster, “Radar Observations of Magnetosphere-Ionosphere Coupling at Mid and High Latitudes,” J. Geoelectr. 47, 801–812 (1995).
W. D. Gonzales, J. A. Joselyn, Y. Kamide, et al., “What Is a Geomagnetic Storm?,” J. Geophys. Res. 99(A4), 5771–5792 (1994).
A. V. Guglielmi, N. A. Zolotukhina, I. Kangas, J. Kultima, and A. S. Potapov, “Increase in Pc1 Wave Activity before Sudden Magnetic Impulses SI,” Issled. Geomagn. Aeron. Fiz. Solntsa, No. 112, 115–123 (2001).
Huang Chao-Song and J. C. Foster, “Prompt Effects of Solar Wind Variations on the Inner Magnetosphere and Midlatitude Ionosphere,” in Space Weather Week, April 16–19 (Boulder, 2002), p. 17.
J. Kangas, J. Kultima, A. Guglielmi, et al., “Impact of Interplanetary Shock on the ULF Wave Activity: A Case Study of the Storm Sudden Commencement on September 22, 1999,” Earth Planets Space 53, 1173–1182 (2001).
J. U. Kozyra, M. O. Chandler, D. C. Hamilton, et al., “The Role of Ring Current Nose Events in Producing Stable Auroral Red Arc Intensifications during the Main Phase: Observations during the September 19–24, 1984, Equinox Transition Study,” J. Geophys. Res. 98A, 9267–9283 (1993).
L. R. Lyons, “Substorms: Fundamental Observational Features, Distinction from Other Disturbances and External Triggering,” J. Geophys. Res. 101A, 13011–13025 (1996).
T. Ondoh and K. Obu, “Prediction of HF Communications Disturbances by Pre-SC HF Field Increase on Polar Paths Crossing the Auroral Zone,” Sol.-Terr. Predict. Proc. 4, D2-21–D2-30 (1980).
C. G. Park, “A Morphological Study of Substorm-Associated Disturbances in the Ionosphere,” J. Geophys. Res. 79(19), 2821–2827 (1974).
O. M. Pirog, V. D. Urbanovich, and G. A. Zherebtsov, “Effects of Substorms in the Night Auroral E-Region,” in Proceedings of the 5th International Conference on Substorms, St. Petersburg, 2000, pp. 545–547.
G. W. Pröss, “On Explaining the Local Time Variation of Ionospheric Storm Effects,” Ann. Geophys. 11 P, 1–9 (1993).
G. W. Pröss, L. H. Brace, H. G. Mayr, et al., “Iono-spheric Storm Effects at Subauroral Latitudes: A Case Study,” J. Geophys. Res. 96, 1275–1288 (1991).
M. I. Pudovkin, O. M. Raspopov, and N. G. Kleimenova, Disturbances of the Earth’s Electromagnetic Field. Part 2. Short-Period Oscillations of the Geomagnetic Field (Leningr. Gos. Univ., Leningrad, 1976) [in Russian].
A. S. Rodger, G. L. Wrenn, and H. Rishbeth, “Geomagnetic Storms in the Antarctic F-Region. 2. Physical Interpretation,” J. Atmos. Terr. Phys. 51, 851–866 (1989).
G. Rostoker, S.-I. Akasofu, J. Foster, et al., “Magnetospheric Substorms—Definition and Signatures,” J. Geophys. Res. 85A, 1663–1668 (1980).
B. A. Tinsley, “Energetic Neutral Atom Precipitation as a Possible Source of Midlatitude F Region Winds,” Geophys. Res. Lett. 6(4), 291–293 (1979).
K. C. Yeh, S. Y. Ma, K. H. Lin, and A. Conkright, “Global Ionospheric Effects of the October 1989 Geomagnetic Storm,” J. Geophys. Res. 99A, 6201–6218 (1994).
N. A. Zolotukhina, “On Geophysical Precursors of SSC,” Issled. Geomagn. Aeron. Fiz. Solntsa, No. 66, 51–54 (1983).
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Original Russian Text © D.V. Blagoveshchensky, A.S. Kalishin, 2009, published in Geomagnetizm i Aeronomiya, 2009, Vol. 49, No. 2, pp. 213–223.
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Blagoveshchensky, D.V., Kalishin, A.S. Increase in the critical frequency of the ionospheric F region prior to the substorm expansion phase. Geomagn. Aeron. 49, 200–209 (2009). https://doi.org/10.1134/S0016793209020091
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DOI: https://doi.org/10.1134/S0016793209020091