Abstract
Based on the equatorial vertical ion drift measured by DMSP and cross polar cap potential (φ cpc) from AMIE output during 2001 to 2003, this paper investigates the relationship of φ cpc and its temporal variation rate (Δφ cpc) with the disturbed ion velocity (ΔV x ) which is the difference between the disturbed days (Kp⩾4) and quiet days (Kp<2). The statistical analysis shows: (1) The ΔV x correlates better with Δφ cpc than with ϕ cpc, indicating that the electric field penetration is more easily to occur when solar wind input rapidly varies with time. (2) The optimal delay time of electric field penetration from the high-latitude magnetosphere to equatorial ionosphere has local time dependence which is longer on the nightside than on the dayside. It may be due to more complicated electrodynamic process on the nightside. (3) With the linear relationship between Δϕ cpc and Δϕ V x , it is obtained that the penetration efficiency is about 4.5%–13.9% at day and 31%–42% at night, coinciding well with former studies.
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Richmond A D, Peymirat C, Roble R G. Long-lasting disturbances in the equatorial ionospheric electric field simulated with a coupled magnetosphere-ionosphere-thermosphere model. J Geophys Res, 2003, 108(A3): 1118–1129
Nishida A. Coherence of geomagnetic DP2 fluctuation with interplanetary variations. J Geophys Res, 1968, 73(17): 5549–5559
Kelley M C, Makela J J, Chau J L, et al. Penetration of the solar wind electric field into magnetosphere/ionosphere system. Geophys Res Lett, 2003, 30(4): 1158–1160
Gonzales C A, Kelley M C, Carpenter L A, et al. Evidence for a magnetospheric effect on mid-latitude electric fields. J Geophys Res, 1978, 83(A9): 4397–4399
Fejer B G, Kelley M C, Senior C, et al. Low- and mid-latitude ionospheric electric fields during the January 1984 GISMOS Campaign. J Geophys Res, 1990, 95(A3): 2367–2377
Wolf R A, Spiro R W, Sazykin S, et al. How the earth’s inner magnetosphere works: An evolving picture. J Atmos Solar-Terr Phys, 2007, 69(3): 288–302
Schield M A, Freeman J W, Dessler A J. A source for field-aligned currents at auroral latitudes. J Geophys Res, 1969, 74(1): 247–256
Jaggi R K, Wolf R A. Self-consistent calculation of the motion of a sheet of ions in the magnetosphere. J Geophys Res, 1973, 78(16): 2852–2866
Nopper R W, Carovillano R L. Polar-equatorial coupling during magnetically active periods. Geophys Res Lett, 1978, 5(8): 699–702
Vasyliunas V M. The interrelation of magnetospheric processes. In: Proceedings of a Symposium on Earth’s Magnetosphere Processes. Norwell: D. Reidel, 1972. 29–38
Peymirat C, Richmond A D, Kobea A T. Electrodynamic coupling of high and low latitudes: Simulations of shielding/overshielding effects. J Geophys Res, 2000, 105(A10): 22991–23003
Huang C S. Continuous penetration of interplanetary electric field to the equatorial ionosphere over eight hours during intense geomagnetic storms. J Geophys Res, 2008, 113: A11305, doi: 10.1029/2008-JA013588
Rich F J, Hairston M. Large-scale convection patterns observed by DMSP. J Geophys Res, 1994, 99(A3): 3827–3844
Weimer D R. A flexible, IMF dependent model of high-latitude electric potentials having “space weather” applications. Geophys Res Lett, 1996, 23(18): 2549–2552
Ridley A J, Kihn E A. Polar cap index comparisons with AMIE cross polar cap potential, electric field, and polar cap area. Geophys Res Lett, 2004, 31: L07801, doi: 10.1029/2003GL019113
Fejer B G. The equatorial ionospheric electric fields. A review. J Atmos Terr Phys, 1981, 43(5–6): 377–386
Kikuchi T, Hashimoto K K, Tachihara H, et al. Equatorial counterelectrojets during substorms. J Geophys Res, 2003, 108(A11): 1406–1418
Huang C S, Foster J C, Goncharenko L P, et al. Variations of low-latitude geomagnetic fields and Dst index caused by magnetospheric substorms. J Geophys Res, 2004, 109: A05219, doi: 10.1029/2003J-A010334
Blanc M, Richmond A D. The ionospheric disturbance dynamo. J Geophys Res, 1980, 85(A4): 1669–1686
Huang C S, Sazykin S, Chau J L, et al. Penetration electric fields: Efficiency and characteristic time scale. J Atmos Solar-Terr Phys, 2007, 69(10): 1135–1146
Wei Y, Hong M H, Wan W X, et al. A modeling study of interplanetary-equatorial electric field penetration efficiency (in Chinese). Chinese J Geophys, 2008, 51(5): 1279–1284
Khachikjan G Ya, Koustov A V, Sofko G J. Dependence of Super-DARN cross polar cap potential upon the solar wind electric field and magnetopause subsolar distance. J Geophys Res, 2008, 113: A09214, doi: 10.1029/2008JA013107
Russell C T, Luhmann J G, Lu G. Nonlinear response of the polar ionosphere to large values of the interplanetary electric field. J Geophys Res, 2001, 106(A9): 18495–18504
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Xiong, W., Xu, J., Wang, H. et al. Effect of temporal variation rate of cross polar cap potential on the equatorial ionospheric vertical drift: A statistical study. Sci. China Technol. Sci. 55, 1217–1223 (2012). https://doi.org/10.1007/s11431-012-4792-y
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DOI: https://doi.org/10.1007/s11431-012-4792-y