The Comparison of Responses to Geomagnetic Activity Changes of foF2 Predicted by IRI with Observations at Magnetic Conjugate Points for Middle and High Latitudes

Abstract

In this study, the response to geomagnetic storms of the ionospheric F2 layer critical frequency (foF2) was investigated at the magnetic conjugate points. The hourly foF2 data observed at the magnetic conjugate points of middle and high latitudes for the geomagnetic stormy days around both of 1976 and foF2 data received from IRI-2016 Model for same points were used. The foF2 data observed in magnetic conjugate points and received from IRI Model were examined using the superposed epoch analysis method and the results obtained were compared. From the results of analysis, it was observed that the foF2 data observed at magnetic conjugate points and received from IRI Model simultaneously respond to geomagnetic activity changes for both the middle latitudes and the high latitudes.

Keywords

• Ionosphere
• conjugate points
• geomagnetic activity
• critical frequency
• International Reference Ionosphere (IRI)

References

1. [1] T. Oguti, “Conjugate point problems”, Space Science Reviews, vol. 9, pp. 745-804, 1969.
2. [2] K. D. Cole and J. A. Thomas, “Maps of the difference in geomagnetic field at conjugate areas”, Planetary and Space Science, vol. 16, pp. 1357-1363, 1968.
3. [3] E. M. Wescott, “Magnetoconjugate phenomena”, Space Science Reviews, vol. 5, pp. 507-561, 1966.
4. [4] W. H. Campbell and S. Matsushita, “World maps of conjugate coordinates and L contours”, Journal of Geophysical Research, vol. 72, pp. 3518-3521, 1967.
5. [5] F. D. Barish and R. E. Wiley, “World contours of conjugate mirror locations”, Journal of Geophysical Research: Space Physics, vol. 75, pp. 6342-6346, 1970.
6. [6] K. Makita, T. Hirasawa and F. Ryoichi, “Visual auroras observed at the Syowa station-Iceland conjugate pair”, Polar Res. Spec., vol. 18, pp. 212-225, 1981.
7. [7] K. Makita, C. I. Meng and S. I. Akasofu, “Comparison of the auroral electron precipitation in the northern and southern conjugate regions by two DMSP satellites”, Polar Res. Spec., vol. 26, pp. 149-159, 1983.
8. [8] N. Sato, R. Fujii, T. Ono, H. Fukunishi and T. Hirasawa, “Conjugacy of proton and electron auroras observed near L=6.1”, Geophys. Res. Lett., vol. 13, pp. 1368-1371, 1986.

9. [9] T. Nagata, “Research of geomagnetically conjugate phenomena in Antarctica since the IGY”, Polar Res. Spec., vol. 48, pp. 1-45, 1987.
10. [10] H. C. Stenbeak-Nielsen and A. Otto, “Conjugate auroras and the inter-planetary magnetic field”, J. Geophys. Res., vol. 102, pp. 2223-2232, 1997.
11. [11] L. L. Lazutin, L. P. Borovkov, T. V. Kozelova, I. A. Kornilov, V. R. Tagirov, A. Korth, J. Stadsnes and S. Ullaland, “Investigation of the conjugacy between auroral breakup and energetic electron injection”, J. Geophys. Res., vol. 105, pp. 18495-18503, 2000.
12. [12] R. W. Schunk and A. F. Nagy, Ionospheres: Physics, Plasma Physics and Chemistry, Cambridge University Press, pp. 366-432. 2000.
13. [13] N. Østgaard, S. B. Mende, H. U. Frey, T. J. Immel, L. A. Frank, J. B. Sigwarth and T. J. Stubbs, “Interplanetary magnetic field control of the location of substorm onset and auroral features in the conjugate hemispheres”, J. Geophys. Res., vol. 109, A07204-A07214, 2004.
14. [14] N. Østgaard, S. B. Mende, H. U. Frey, J. B. Sigwarth, A. Asnes and J. M. Weygand, “Auroral conjugacy studies based on global imaging”, J. Atmos. Sol-Terr. Phys., vol. 69, pp. 249-255, 2007.
15. [15] A.S. Besprozvannaya, “Empirical modelling of the F2 peak density at 50°–70° invariant latitude using magnetic conjugacy”, Advances in Space Research, vol. 11, pp. 23-28, 1991.
16. [16] H. Le, L. Liu, X. Yue and W. Wan, “The ionospheric behavior in conjugate hemispheres during the 3 October 2005 solar eclipse”, Ann. Geophys., vol. 27, pp. 179-184, 2009.
17. [17] T. L. Gulyaeva, F. Arikan and I. Stanislawska, “Inter-hemispheric imaging of the ionosphere with the upgraded IRI-Plas model during the space weather storms”, Earth Planets Space, vol. 63, pp. 929–939, 2011.
18. [18] N. Yu, M. Ganushkina, V. Kubyshkina, N. Partamies and E. Tanskanen, “Interhemispheric magnetic conjugacy”, Journal of Geophysical Research: Space Physical, vol. 118, pp. 1049-1061, 2013.
19. [19] E. Timoçin, “The north and south symmetry of the ionospheric storms at magnetic conjugate points for low latitudes during the March 1976 severe geomagnetic storms and the relation between daily changes of the storms with geomagnetic activity indices”, Advances in Space Research, vol. 63, pp. 3965-3977, 2019.
20. [20] E. Timoçin, “The effect of different phases of severe geomagnetic storms on the low latitude ionospheric critical frequencies”, Advances in Space Research, vol. 64, pp. 2280-2289, 2019.
21. [21] E. Timoçin, İ. Ünal, Y. Tulunay and Ü. D. Göker, “The effect of geomagnetic activity changes on the ionospheric critical frequencies (fof2) at magnetic conjugate points”, Advances in Space Research, vol. 62, no. 4, pp. 821-828, 2018.
22. [22] NASA Goddard Space Flight Center (GSFC), https://ccmc.gsfc.nasa.gov/model web/models/iri2016_vitmo.php, [Accessed April 15 2018].
23. [23] Y. Tulunay, “Variability of mid-latitude ionospheric foF2 compared to IMF-polarity inversions”, Adv. Sapace Res., vol. 15, no. 2, pp. 35-44, 1995.
24. [24] C. J. Davis, M. N. Vild, M. Lockwood and Y. K. Tulunay, “Ionospheric and geomagnetic responses to changes in IMF BZ: A superposed epoch study”, Annali Di Geofisica, vol. 39, no. 4, pp. 853-862, 1997.