Article : On the geomagnetic and ionospheric responses to an intense storm associated with weak IMF Bz and high solar wind dynamic pressure
Authors : Błęcki, J.Space Research Centre, Polish Academy of Sciences, Warszawa, Poland, email@example.com, Chukwuma, V.U.Department of Physics, Olabisi Onabanjo University, Ago-Iwoye, Nigeria, firstname.lastname@example.org,
Abstract : A study of the geomagnetic storm of July 13-14, 1982, and its ionospheric response is presented using the low-latitude magnetic index, Dst, and interpreted using solar wind interplanetary data: proton number density, solar wind flow speed, interplanetary magnetic field southward component BZ, and solar wind dynamic pressure. The F2 region structure response to the geomagnetic storm was studied using foF2 data obtained during the storm from a network of various ionosonde stations. Our results appear to show simultaneous abrupt depletion of foF2 that occurred at all latitudes in both the East Asian and African/European longitudinal zone during the period: 18:00–19:00 UT on July 13 and is as result of an abrupt in-crease in the dynamic pressure between 16:00 and 17:00 UT. The dynamic pressure increased from 3.21 to 28.07 nPa within an hour. The aforementioned abrupt depletion of foF2 simultaneously resulted in an intense negative storm with peak depletion of foF2 at about 19:00 at all the stations in the East Asian longitudinal zone. In the African/European longitudinal zone, this simultaneous abrupt depletion of foF2 resulted in intense negative storm that occurred simultaneously at the low latitude stations with peak depletion at about 20:00 UT on July 13, while the resulting negative storm at the mid latitude stations recorded peak depletion of foF2 simultaneously at about 2:00 UT on July 14. The present results indicate that most of the stations in the three longitudinal zones showed some level of simultaneity in the depletion of foF2 between 18:00 UT on July 13 and 2:00 UT on July 14. The depletion of foF2 during the main phase of the storm was especially strongly dependent on the solar wind dynamic pressure.
Bibliography : Benkova, N.P., K.N. Vasilev, V.N. Ishikov, N.S. Kariner, E.F. Kozlov, N.M. Samorokin, L.A. Kolesnikova, E.V. Lavrova, E.V. Nepomnyashchaya, A.M. Novikov, N.K. Pereyaslova and V.V. Formichev, 1983, Helio- and geophysical phenomena in July 1982, Geomagn. and Aeron. 23, 5, 579-582.
Blagoveshchensky, D.V., O.M. Pirog, N.M. Polekh and L.V. Chistyakova, 2003, Mid-latitude effects of the May 15, 1997 magnetic storm, J. Atmos. Sol.-Terr. Phys. 65, 203-210.
Blagoveshchensky, D.V., J.W. MacDugall and A.V. Pyatkova, 2006, The ionosphere of Europe and North America before the magnetic storm of October 28, 2003, Geomagn. and Aeron. 46, 3, 350-360.
Bolduc, L., 2002, GIC observations and studies in the Hydro-Quebec power system, J. Atmos. Sol.-Terr. Phys. 64, 1793-1802.
Boudouridis, A., E. Zesta, L.R. Lyons, P.C. Anderson and D. Lummerzheim, 2005, Enhanced solar wind geoeffectiveness after a sudden increase in dynamic pressure during southward IMF orientation, J. Geophys. Res. 110, A05214, doi: 1029/2004JA010704.
Buonsanto, M.J., and T.J. Fuller-Rowell, 1997, Strides made in understanding space weather at Earth, EOS, Transactions, AGU 78, 1, p. 1.
Chaman-Lal, 2000, Sun-Earth geometry, geomagnetic activity, and planetary F2 ion density Part I: Signatures of magnetic reconnection, J. Atmos. Sol.-Terr. Phys. 62, 3-16.
Chandra, S., and N.W. Spencer, 1976, Thermospheric storms and related ionospheric effects, J. Geophys. Res. 81, 28, 5018-5026.
Chukwuma, V.U., 2003a, On F2 response to geomagnetic storm, Acta Geod. Geoph. Hung. 38, 1-7.
Chukwuma, V.U., 2003b, Interplanetary phenomenon, geomagnetic and ionospheric response associated with the storm of October 20-21, 1989, Acta Geophys. Pol. 51, 459-472.
Chukwuma, V.U., 2007, On positive and negative ionospheric storms, Acta Geod. Geoph. Hung. 42, 1, 1-21.
Cliffswallow, W., 1993, Region 5395 of March 1989, NOAA Techn. Memor. ERL SEL-82, Boulder, 1-40.
Czech, P., S. Chano, H. Huynh and A. Dutil, 1992, The Hydro-Quebec system blackout of March 13, 1989: system response to geomagnetic disturbance, EPRI Report, TR-100450. In: Proceedings of Geomagnetically Induced Current Conference, Millbrae, CA, 8-10 Nov, 1989, 19.1-19.21.
Daglis, I.A., 1997, The role of magnetosphere-ionosphere coupling in magnetic storm dynamics. In: B.T. Tsurutani, W.D. Gonzalez and Y. Kamide (eds.), “Magnetic Storms”, Geophys. Monogr. Series 98, AGU Washington, DC, 107-116.
Danilov, A.D., 2001, F2 region response to geomagnetic disturbance, J. Atmos. Sol.-Terr. Phys. 63, 431-440.
Davis, C.J., M.N. Wild, M. Lockwood and Y.K. Tulmay, 1997, Ionospheric and geomagnetic responses to changes in IMF Bz: a superposed epoch study, Ann. Geophys. 15, 217-230.
Gonzalez, W.D., and B.T. Tsurutani, 1987, Criteria of interplanetary parameters causing intense magnetic storms (Dst < 100 nT), Planet. Space Sci. 35, 1101-1109.
Gonzalez, W.D., J.A. Joselyn, Y. Kamide, H.W. Kroehl, G. Rostoker, B.T. Tsurutani and V.M. Vasyliunas, 1994, What is a geomagnetic storm?, J. Geophys. Res. 99, A4, 5771-5792.
Gonzalez, W.D., A.L. Clua de Gonzalez, A. Dal Lago, B.T. Tsurutani, J.K. Arballo, G.S. Lakhina, B. Buti and C.M. Ito, 1998, Magnetic cloud field intensities and solar wind velocities, Geophys. Res. Lett. 25, 963-969.
Gonzalez, W.D., A.L. Clua de Gonzalez, J.H.A. Sobrai, A. Dal Lago and L.E. Vieira, 2001, Solar and interplanetary causes of very intense geomagnetic storms, J. Atmos. Sol.-Terr. Phys. 63, 403-412.
Gonzalez, W.D., B.T. Tsurutani, R.P. Lepping and R. Schwenn, 2002, Interplanetary phenomena associated with very intense geomagnetic storms, J. Atmos. Sol.-Terr. Phys. 64, 173-181.
Huang Chao-Song, J.C. Foster and P.K. Erickson, 2002, Effects of solar wind variations on the midlatitude ionosphere, J. Geophys. Res. 107, A8, doi: 10.1029/2001JA009025.
Kamide, Y., W. Baumjohann, I.A. Daglis, W.D. Gonzalez, M. Grande, J.A. Joselyn, R.L. McPherron, J.L. Philips, E.G.D. Reeves, G. Rostoker, A.S. Sharma, H.J Singer, B.T. Tsurutani and V.M. Vasyliunas, 1998a, Current understanding of magnetic storms: storm/substorm relationship, J. Geophys. Res. 103, 17,705-17,728.
Kamide, Y., N. Yokoyama, W.D. Gonzalez, B.T. Tsurutani, A. Brekke and S. Masuda, 1998b, Two-step development of geomagnetic storms, J. Geophys. Res. 103, 6917-6921.
Kappenman, J.G., and V.D. Albertson, 1990, Bracing for the geomagnetic storms, IEEE Spectrum, March 1990, 27-33.
Legrand, J.P., and P.A. Simon, 1991, A two component solar cycle, Solar Phys. 131, 187-194. Maih, M.A., 1989, Observation of low energy particle precipitation at low altitude in the equatorial zone, J. Atmos. Terr. Phys. 51, 541-549.
Nielsen, E., and F. Honary, 2000, Observation of ionospheric flows and particle precipitation following a sudden commencement, Ann. Geophys. 18, 908-917.
Prolss, G.W., 1995, Ionospheric F-region storms. In: H. Volland (ed.), “Handbook of Atmospheric Electrodynamics”, 2, CRC Press, Boca Raton, FL, 195-248.
Siscoe, G.L., and R.L. McPherron, 2005, Diminished contribution of ram pressure to Dst during magnetic storms, J. Geophys. Res. 110, A12227, doi: 10.1029/2005JA011120.
Soicher, H., 1972, Sunrise effects on the latitudinal variations of topside ionospheric densities and scale heights, Nature 239, 93-95.
Strickland, D.J., R.E. Daniell and J.D. Craven, 2001, Negative ionospheric storm coincident with DE 1-observed thermospheric disturbance on October14, 1981, J. Geophys. Res. 106, A10, 21049-21062.
Sutton, E.K., J.M. Forbes, R.S. Nerem and T.N. Woods, 2006, Neutral density response to the solar flares of October and November 2003, Geophys. Res. Lett. 33, L22101, doi: 10.1029/2006GL027737.
Tsurutani, B.T., and W.D. Gonzalez, 1997, The interplanetary causes of magnetic storms: a review. In: B.T. Tsurutani et al. (eds.), “Magnetic Storms”, Geophys. Monograph Series 98, AGU, Washington, DC, 77-90.
Tsurutani, B.T., W.D. Gonzalez, F. Tang and Y.T. Lee, 1992, Great magnetic storms, Geophys. Res. Lett. 19, 73-81.
Tsurutani, B.T., W.D. Gonzalez, G.S. Lakhina and S. Alex, 2003, The extreme storm of 1-2 September, 1859, J. Geophys. Res. 108, A7, 1268-1275.
Vats, H.O., 1992, Solar wind and geomagnetic activity. In: G.K. Rangarajan and B.R. Arora, (eds.), “Geomagnetic Studies at Low Latitudes”, Geological Society of India, Bangalore, 365-373.
Vieira, L.E., W.D. Gonzalez, A.L. Clua de Gonzalez and A. Dal Lago, 2001, A study of magnetic storms development in two or more steps and its association with the polarity of magnetic clouds, J. Atmos. Sol.-Terr. Phys. 63, 457-461.
Qute : Błęcki, J. ,Chukwuma, V.U. ,Chukwuma, V.U. , On the geomagnetic and ionospheric responses to an intense storm associated with weak IMF Bz and high solar wind dynamic pressure. Acta Geophysica Vol. 55, no. 4/2007