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Longitudinal effects in geomagnetic disturbances at mid-latitudes
Earth, Planets and Space volume 53, pages 969–979 (2001)
Abstract
The paper describes the differences in the magnetic disturbance effect on horizontal geomagnetic field (H) and declination (D) at Alibag (India), Lunping (Taiwan), Chichijima (Japan) and Kakioka (Japan). It is suggested that the trapped particles in the earth’s magnetic field lines are guided by the dipole declination and not by the ground declination and follow the direction towards the geomagnetic pole. The disturbance vector is given by sin (ψ - D) where ψ and D are dipole and ground declinations of the station respectively. The mean disturbance daily variation (SD) of H field is similar at all stations but SD of eastward field (Y) is negative at Alibag but positive at Lunping, Chichijima and Kakioka. Similarly, the daily mean values of H field systematically decrease with increasing ring current index (decreasing value of Dst index) for all stations. But declination values are positively related with Dst index at Alibag and negatively related at Lumping, Chichijima and Kakioka. The SSC amplitude in Y field shows negative values at Alibag but positive values at Kakioka. The storm-time variations Dst(H) show negative excursion during the main phase of the storm at Alibag, Lunping, Chichijima and Kakioka. On the other hand, the Dst variations in declination during the main phase show negative excursions at Alibag but positive excursions at Lumping and Chichijima. This shows a very significant longitudinal inequality in storm-time behavior of eastward geomagnetic field at any place on the earth.
References
Akasofu, S. I. and S. Chapman, The ring current, geomagnetic disturbance and the Van Allen radiation belts, J. Geophys. Res., 66, 1321–1350, 1961.
Chapman, S., An outline of theory of magnetic storms, Proc. Roy. Soc. Lond., A95, 1918.
Chapman, S. and V. C. A. Ferraro, A new theory of magnetic storms Part I The initial phase, Terr. Mag. Atmos. Elect., 36, 77–97, 1931a. Part II The initial phase, Terr. Mag. Atmos. Elect., 36, 171–186, 1931b. Part III The initial phase, Terr. Mag. Atmos. Elect., 37, 147–156, 1932a. Part IV The initial phase, Terr. Mag. Atmos. Elect., 37, 421–429, 1932b.
Fukushima, N., Declination change of SC, its local time and seasonal dependence at Kakioka, Japan, J. Geomag. Geoelectr., 18, 99–101, 1966.
Iyemori, T., Storm-time magnetospheric currents inferred from mid-latitude geomagnetic field variations, J. Geomag. Geoelectr., 42, 1249–1265, 1990.
Moos, N. A. F., Magnetic observations made at the government observatory, Bombay 1846 to 1905 and their discussions, Part II, The phenomenon and its discussion, Bombay, 1910.
Obayashi, T. and J. A. Jacobs, Sudden commencement of magnetic storms and atmospheric dynamo action, J. Geophys. Res., 62, 589–616, 1957.
Rastogi, R. G., Field aligned currents at equatorial latitudes during geomagnetic disturbances, Ind. J. Radio Space Phys., 20, 319–326, 1991.
Rastogi, R. G., Geomagnetic disturbance effects on equatorial electrojet current, J. Geomag. Geoelectr., 41, 317–324, 1992.
Rastogi, R. G., Remarkable solar cycle and seasonal dependence of the diurnal geomagnetic D-variation of equatorial electrojet station Kodaikanal, J. Geomag. Geoelectr., 45, 657–668, 1993a.
Rastogi, R. G., Meridional currents during equatorial geomagnetic disturbances, Geophys. Res. Lett., 20, 5–7, 1993b.
Rastogi, R. G., Solar flare effects on zonal and meridional currents at equatorial electrojet station Annamalainagar, J. Atmos. Terr. Phys., 58, 1417–1420, 1996a.
Rastogi, R. G., A new relationship between the geomagnetic H and Y fields during disturbed conditions, Ind. J. Radio Space Phys., 25, 300–307, 1996b.
Rastogi, R. G., Meridional equatorial electrojet currents in the American sector, Annals Geophysicae, 17, 220–230, 1999a.
Rastogi, R. G., Signatures of storm sudden commencements in geomagnetic H, Y and Z fields at Indian observatories during 1958–1992, Annals Geophysicae, 17, 1426–1438, 1999b.
Rastogi, R. G., B. M. Pathan, D. R. K. Rao, T. S. Sastry, and J. H. Sastri, Solar flare effects on the geomagnetic elements during normal and counter electrojet periods, Earth Planets Space, 51, 947–957, 1999.
Sano, Y., Morphological studies on sudden commencement of magnetic storms using the rapid run magnetograms during the IGY, Mem. Kakioka Magnetic Observatory, 11(1), 1–52, 1963.
Schmidt, A., Erdmagnetismus, Enzyk, Math. Wiss., 6, Leipzig, 1917.
Singer, S. F., A new model of magnetic storms and auroras, EOS Trans. Amer. Geophys. Union, 38, 175–190, 1957.
Sugiura, M., Hourly values of equatorial Dst for IGY in Ann. Inter. Geophys. Year, 35, 9–45, Pergamon Press, Oxford, 1964.
Sugiura, M. and S. Chapman, The average morphology of geomagnetic storm with sudden commencement, Abhandl. Akad. Wiss. Gottingen. Math-Physik. K.I. Sonderh, 4, 53 pp, 1960.
Tsunomura, S., Characteristics of geomagnetic sudden commencement observed in middle and low latitudes, Earth Planets Space, 50, 755–772, 1998.
Tsunomura, S., T. Toya, Y. Ishii, and S. Teshima, A study of geomagnetic storms on the basis of magnetic observations in Japanese chain observatories, Mem. Kakioka Magnetic Observatory, 27, 1–105, 1999.
Vestine, E. H., L. Laporte, I. Langiand, and W. E. Scott, The geomagnetic field and its application and analysis, Carnegie Institute of Washington, Pub. No. 580, 1947.
Wilson, C. R. and M. Sugiura, Hydromagnetic interpretation of sudden commencement of magnetic storms, J. Geophys. Res., 66, 4097–4111, 1961.
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Rastogi, R.G., Winch, D.E. & James, M.E. Longitudinal effects in geomagnetic disturbances at mid-latitudes. Earth Planet Sp 53, 969–979 (2001). https://doi.org/10.1186/BF03351694
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DOI: https://doi.org/10.1186/BF03351694