References

ANGEO

Annales Geophysicae

ANGEO

Ann. Geophys.

1432-0576

Copernicus Publications

Göttingen, Germany

10.5194/angeo-27-1175-2009

Effects of strong IMF Bz southward events on the equatorial and mid-latitude ionosphere

Astafyeva

¹ ²

Department of Natural History sciences, Hokkaido University, Kita-ku, N10 W8, Sapporo, 060-0810, Japan

on leave from: Institute of Solar-Terrestrial Physics SB RAS, 126 Lermontov street, P.O. Box 291, Irkutsk, 664033, Russia

09 03 2009

27 3 1175 1187

2009

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Dayside ionospheric response to five intense geomagnetic storms (Dst<−120 nT) that occurred in 2001–2005 was investigated by use of simultaneous TEC measurements by the CHAMP, SAC-C, TOPEX/Jason-1 satellites. Since the satellites passed over different longitudinal sectors and measured TEC in different range of altitudes, it was possible to obtain information about altitudinal and longitudinal ionosphere redistribution during these storms. Severe enhancements (up to ~350%) of the equatorial and mid-latitude TEC above ~430 km with concurrent traveling of the equatorial anomaly crests for a distance of 10–15° of latitude were observed during two of the five events analyzed here (6 November 2001 and 8 November 2004). This phenomenon, known as the dayside ionosphere uplift, or the "daytime super-fountain effect", occurred after sudden drop in IMF Bz and consequent penetration of the electric fields to the low-latitude ionosphere. However, the same order Bz negative events caused comparatively weak changes in the dayside TEC (up to ~80 TECU) during the other three events of 18 June 2003, 11 February 2004 and 24 August 2005. At the main phase of these storms there were mostly observed formation of the "typical" dual peak structure of the equatorial anomaly rather than the reinforcement of the fountain effect and the anomaly itself. Possible reasons and factors responsible for the development of the extreme ionosphere effects are discussed in the paper.

References 1

Abdu, M. A., Walker, G. O., Reddy, G. B. M., Sobral, J. H. A., Fejer, B. G., Kikuchi, T., Trivedi, N. B., and Szuszczewicz, E. P.: Electric field versus neutral wind control of the equatorial anomaly under quiet and disturbed conditions: A global perspective from SUNDIAL-86, Ann Geophys., 8, 419–430, 1990.

Abdu, M. A., Sobral, J. H. A., de Paula, E. R., and Batista, I. S.: Magnetospheric disturbance effects on the Equatorial Ionization Anomaly: an overview, J. Atmos. Terr. Phys., 53(8), 757–771, 1991.

Afraimovich, E. L., Voeykov, S. V., and Tatarinov, P. V.: Experimental evidence of the solitary internal gravity wave existence during the major magnetic storm on October 30, 2003, as deduced from data of global GPS network and GPS receiver on the LEO satellite CHAMP, Proceedings of URSI GA 2005, GP1.16(0245), 2005.

Afraimovich, E. L., Astafyeva, E. I., Oinats, A. V., Yasukevich, Yu. V., and Zhivetiev, I. V.: Global electron content: a new conception to track solar activity, Ann. Geophys., 26, 335–344, 2008.

Astafyeva, E. I., Afraimovich, E. L., and Kosogorov, E. A.: Dynamics of total electron content distribution during strong geomagnetic storms, Adv. Space Res., 39, 1313–1317, https://doi.org/10.1016/j.asr.2007.03.006, 2007.

Astafyeva, E.: Dayside ionospheric uplift during strong geomagnetic storms as detected by the CHAMP, SAC-C, TOPEX and Jason-1 satellites, Adv. Space Res., in press, https://doi.org/10.1016/j.asr.2008.09.036, 2009.

Basu, S., Basu, Su., Rich, F. J., Groves, K. M., MacKenzie, E., Coker, C., Sahai, Y., Fagundes, P. R., and Becker-Guedes, F.: Response of the equatorial ionosphere at dusk to penetration electric fields during intense magnetic storms, J. Geophys. Res, 12, A08308, https://doi.org/10.1029/2006JA012192, 2007.

Fejer, B. G.: Low latitude electrodynamic plasma drifts: a review, J. Atmos. Terr. Phys., 53, 8, 677–693, 1991.

Foster, J. C. and Coster, A. J.: Conjugate localized enhancement of total electron content at low latitudes in the American sector, J. Atmos. Solar-Terr. Phys., 69, 1241–1252, 2007.

Fu, L. L., Christensen, E. J., Yamarone Jr., C. A., Lefebvre, M., Menard, Y., Dorrer, M., and Escuder, P.: TOPEX/Poseidon mission overview, J. Geophys. Res., 99, 24396–24381, 1994.

Fuller-Rowell, T. J., Codrescu, M. V., Fejer, B. G., Borer, W., Marcos, F., and Anderson, D. N.: Dynamics of the low-latitude thermosphere: Quiet and disturbed conditions, J. Atmos. Terr. Phys., 59(13), 1533–1540, 1997.

Gonzalez, W D., Joselyn,~J A., Kamide,~Y., Kroehl,~H W., Rostoker,~G., Tsurutani,~B T., and Vasyliunas,~V M.: What is a geomagnetic storm?, J. Geophys. Res., 99(A4), 5771–5792, 1994.

Gonzalez, W. D. and Tsurutani, B. T.: Criteria of interplanetary parameters causing intense magnetic storms ($D_st<-$100 nT), Planet. Space Sci., 35(9), 1101–1109, 1987.

Huang, C., Foster, J., and Kelley, M. C.: Long-duration penetration of the interplanetary electric field to the low-latitude ionosphere during the main phase of magnetic storms, J. Geophys. Res., 110, A11309, https://doi.org/10.1029/2005JA011202, 2005.

Kelley, M. C.: The Earth's Ionosphere: Plasma Physics and Electrodynamics, Academic, New York, 1989.

Mannucci, A. J., Tsurutani, B. T., Iijima, B. A., Komjathy, A., Saito, A., Gonzalez, W. D., Guarnieri, F. L., Kozyra, J. U., and Skoug, R.: Dayside global ionospheric response to the major interplanetary events of October 29–30, 2003 "Halloween Storms", Geophys. Res. Lett., 32, 12, https://doi.org/10.29/2004GL021467, 2005.

Smith, E. J., Slavin, J. A., Zwickl, R. D., and Bame, S. J.: Shocks and storms sudden commencements, in: Solar Wind-Magnetosphere Coupling, edited by: Kamide, Y. and Slavin, J. A., p. 345, D. Reidel, Dordrecht, 1986.

Tsurutani, B., Mannucci, A., Iijima, B., Abdu, M. A., Sobral, J. H. A., Gonzalez, W., Guarneri, F., Tsuda, T., et al.: Global dayside ionospheric uplift and enhancement associated with interplanetary electric fields, J. Geophys. Res., 109, A08302, https://doi.org/10.1029/2003JA010342, 2004.

Tsurutani, B. T., Verkhoglyadova, O. P., Mannucci, A. J., Araki, T., Sato, A., Tsuda, T., and Yumoto, K.: Oxygen ion uplift and satellite drag effects during the 30 October 2003 daytime superfountain event, Ann. Geophys., 25, 569–574, 2007.

Tsurutani, B. T., Verkhoglyadova, O. P., Mannucci, A. J., Saito, A., Araki, T., Yumoto, K., Tsuda, T., Abdu, M. A., Sobral, J. H. A., Gonzalez, W. D., McCreadie, H., Lakhina, G. S., and Vasyliunas, V. M.: Prompt penetration electric fields (PPEFs) and their ionospheric effects during the great magnetic storm of 30–31 October 2003, J. Geophys. Res., 113, A05311, https://doi.org/10.1029/2007JA012879, 2008.

Vlasov, M., Kelley, M. C., and Kil, H.: Analysis of ground-based and satellite observations of F-region behavior during the great magnetic storm of July, 2000, J. Atmos. Sol.-Terr. Phys., 65, 1223–1234, 2003.

Zhao, B., Wan, W., and Liu, L.: Responses of equatorial anomaly to the October–November 2003 superstorms, Ann. Geophys., 23, 693–706, 2005.