References

ANGEO

Annales Geophysicae

ANGEO

Ann. Geophys.

1432-0576

Copernicus Publications

Göttingen, Germany

10.5194/angeo-26-2449-2008

Momentum transfer at the high-latitude magnetopause and boundary layers

Lund

E. J.

¹ Farrugia

C. J.

¹ Sandholt

P. E.

Space Science Center, University of New Hampshire, Durham, New Hampshire, USA

Department of Physics, University of Oslo, Oslo, Norway

13 08 2008

26 8 2449 2458

2008

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How and where momentum is transferred from the solar wind to the magnetosphere and ionosphere is one of the key problems of space physics. Much of this transfer occurs through direct reconnection on the dayside, particularly when the IMF is southward. However, momentum transfer also occurs at higher latitudes via Alfvén waves on old open field lines, even for southward IMF. This momentum is transferred to the ionosphere via field-aligned currents (FACs), and the flow channel associated with these FACs produces a Hall current which causes magnetic variations at high latitude (the Svalgaard-Mansurov effect). We show examples where such momentum transfer is observed with multiple spacecraft and ground-based instruments.

References 1

Armstrong, J. C. and Zmuda, A. J.: Triaxial magnetic measurements of field-aligned currents at 800 km in the auroral region: Initial results, J. Geophys. Res., 78, 6802–6807, 1973.

Cowley, S. W. H.: Magnetospheric asymmetries associated with the $Y$-component of the IMF, Planet. Space Sci., 29, 79–86, 1981.

Cowley, S. W. H.: Magnetosphere-Ionosphere interactions: A tutorial review, in: Magnetospheric Current Systems, edited by: Ohtani, S.-I.,~Fujii, R.,~Hesse, M., and Lysak, R L., Geophys. Monogr. Ser., vol 118, American Geophysical Union, Washington, p 91, 2000.

Farrugia, C J., Sandholt, P E., Denig, W F., and Torbert, R B.: Observations of a correspondence between poleward-moving auroral forms and stepped-cusp ion precipitation, J. Geophys. Res., 103, 9309–9315, 1998.

Farrugia, C J., Sandholt, P E., Maynard, N C., Torbert, R B., and Ober, D M.: Temporal variations in a four-sheet field-aligned current system and associated aurorae as observed during a Polar-ground magnetic conjunction in the midmorning sector, J. Geophys. Res., 108(A6), 1230, https://doi.org/10.1029/2002JA009619, 2003.

Farrugia, C J., Lund, E J., Sandholt, P E., Wild, J A., Cowley, S W H., Balogh,~A., Mouikis,~C., Möbius,~E., Dunlop, M W., Bosqued, J M., Carlson, C W., Parks, G K., Cerisier, J.-C., Kelly, J D., Sauvaud, J.-A., and Rème,~H.: Pulsed flows at the high-altitude cusp poleward boundary, and associated ionospheric convection and particle signatures, during a Cluster-FAST-SuperDARN-Sondrestrom conjunction under a southwest IMF, Ann. Geophys., 22, 2891–2905, 2004a.

Farrugia, C J., Sandholt, P E., Torbert, R B., and Østgaard,~N.: Temporal and spatial aspects of the cusp inferred from local and global ground- and space-based observations in a case study, J. Geophys. Res., 109, A04209, https://doi.org/10.1029/2003JA010121, 2004b.

Hovestadt,~D., Hilchenbach,~M., Bürgi,~A., et al.: CELIAS – Charge, element, and isotope analysis system for SOHO, Solar Phys., 162, 441–481, 1995.

Iijima, T., and Potemra, T. A.: Field-aligned currents in the dayside cusp observed by Triad, J. Geophys. Res., 81, 5971–5979, 1976.

Lee,~L., Kan, J R., and Akasofu, S.-I.: On the origin of cusp field aligned currents, J. Geophys., 57, 217–221, 1985.

Lepping, R P., Acuña, M H., Burlaga, L F., et al.: The Wind Magnetic Field Investigation, Space Sci. Rev., 71, 207–229, 1995.

Lockwood,~M. and Smith, M F.: The variation of reconnection rate at the dayside magnetopause and cusp ion precipitation, J. Geophys. Res., 97, 14 841–14 847, 1992.

Mansurov, S. M.: New evidence of a relationship between magnetic fields in space and on Earth, Geomagn. Aeron. USSR, 9, 622–623, 1969.

Ogilvie, K W., Chornay, D J., Fitzenreiter, R J., et al.: SWE, a comprehensive plasma instrument for the Wind spacecraft, Space Sci. Rev., 71, 55–77, 1995.

Øieroset,~M., Sandholt, P E., Lühr,~H., Denig, W F., and Moretto,~T.: Auroral and geomagnetic events at cusp/mantle latitudes in the prenoon sector during positive IMF By conditions: Signatures of pulsed magnetopause reconnection, J. Geophys. Res., 102, 7191–7206, 1997.

Oksavik,~K., Moen,~J., and Carlson, H C.: High-resolution observations of the small-scale flow pattern associated with a poleward moving auroral form in the cusp, Geophys. Res. Lett., 31, L11807, https://doi.org/10.1029/2004GL019838, 2004.

Provan,~G., Milan, S E., Lester,~M., Yeoman, T K., and Khan,~H.: Simultaneous observations of the ionospheric footprint of flux transfer events and dispersed ion signatures, Ann. Geophys., 20, 281–287, 2002.

Rinne,~Y., Moen,~J., Oksavik,~K., and Carlson, H C.: Reversed flow events in the winter cusp ionosphere observed by the European Incoherent Scatter (EISCAT) Svalbard radar, J. Geophys. Res., 112, A10313, https://doi.org/10.1029/2007JA012366, 2007.

Rosenbauer,~H., Grünwaldt,~H., Montgomery, M D., Paschmann,~G., and Sckopke,~N.: HEOS 2 plasma observations in the distant polar magnetosphere: The plasma mantle, J. Geophys. Res., 80, 2723–2737, 1975.

Russell, C T. and Elphic, R C.: Initial ISEE magnetometer results: Magnetopause observations, Space Sci. Rev., 22, 681–715, 1978.

Russell, C T., Snare, R C., Means, J D.,~Pierce, D.,~Dearborn, D.,~Larson, M.,~Barr, G., and~Le, G.: The GGS/Polar magnetic field investigation, Space Sci.\ Rev., 71, 563–582, 1995.

Sandholt, P E. and Farrugia, C J.: Role of poleward moving auroral forms in the dawn-dusk auroral precipitation asymmetries induced by IMF $B_y$, J. Geophys. Res., 112, A04203, https://doi.org/10.1029/2006JA011952, 2007a.

Sandholt, P E. and Farrugia, C J.: Poleward moving auroral forms (PMAFs) revisited: Responses of aurora, plasma convection and Birkeland currents in the pre- and postnoon sectors under positive and negative IMF $B_y$ conditions, Ann. Geophys., 25, 1629–1652, 2007b.

Sandholt, P E., Farrugia, C J., and Denig, W F.: Detailed dayside auroral morphology as a function of local time for southeast IMF orientation: Implications for solar wind-magnetosphere coupling, Ann. Geophys., 22, 3537–3560, 2004.

Sandholt, P E., Farrugia, C J., Lund, E J., and Denig, W F.: IMF $B_y$ and the spatio-temporal structure of the dayside aurora, in: Recurrent Magnetic Storms: Corotating Solar Wind Streams, edited by: Tsurutani, B., McPherron, R., Gonzalez, W., Lu, G., Sobral, J. H. A., and Gopalswamy, N., Geophysical Monograph 167, AGU, Washington, p 213, 2006.

Scudder, J. D., Hunsacker,~F., Miller,~G., et al.: Hydra – a 3-dimensional electron and ion hot plasma instrument for the Polar spacecraft, Space Sci.\ Rev., 71, 459–495, 1995.

Siscoe, G. L., Lotko, W., and Sonnerup, B. U. Ö.: A high-latitude, low-latitude boundary layer model of the convection current system, J. Geophys. Res., 96, 3487–3495, 1991.

Siscoe, G. L., Erickson, G. M., Sonnerup, B. U. Ö., Maynard, N. C., Siebert, K. D., Weimer, D. R., and White, W. W.: Deflected magnetosheath flow at the high-latitude magnetopause, J. Geophys. Res., 105, 12 851–12 858, 2000.

Smith, C W., L'Heureux,~J., Ness, N F., Acuña, M H., Burlaga, L F., and Scheifele,~J.: The ACE Magnetic Fields Experiment, Space Sci. Rev., 86, 613–632, 1998.

Smith, M F.: Transient dayside reconnection and its effect on the ionosphere, in: Physical Signatures of Magnetospheric Boundary Layer Processes, NATO ASI Series, vol 425, edited by: Holtet, J A. and~Egeland, A., Kluwer, Dordrecht, p 275, 1994.

Sonnerup, B U Ö., Paschmann,~G., Papamastoriakis,~I., Sckopke,~N., Haerendel,~G., Bame, S J., Asbridge, J R., Gosling, J T., and Russell, C T.: Evidence for reconnection at the earth's magnetopause, J. Geophys.\ Res., 86, 10 049–10 067, 1981.

Southwood, D. J.: The ionopsheric signatures of flux transfer events, J. Geophys. Res., 92, 3207–3213, 1987.

Stern, D.: Magnetospheric dynamo processes, in: Magnetospheric Currents, Geophys. Monogr. Ser., vol. 28, edited by: Potemra, T., p. 200, AGU, Washington, D.C., 1984.

Svalgaard, L.: Sector structure of the interplanetary magnetic field and daily variations of the geomagnetic field at high latitudes, Geophys. Pap. R-6, Dan. Meteorol. Inst., Charlottenlund, Denmark, 1968.

Taguchi, S., Sugiura, M., Winningham, J. D., and Slavin, J. A.: Characterization of the IMF $B_y$-dependent field-aligned currents in the cleft region based on DE 2 observations, J. Geophys. Res., 98, 1393–1407, 1993.

Thompson, S M., Kivelson, M G.. Khurana, K K.. Balogh,~A., Rème,~H., Fazakerley, A N., and Kistler, L M.: Cluster observations of quasi-periodic impulsive signatures in the dayside northern lobe: High-latitude flux transfer events, J. Geophys. Res., 109, A02213, https://doi.org/10.1029/2003JA010138, 2004.

Trattner, K J., Fuselier, S A., Peterson, W K., Sauvaud, J.-A., Stenuit,~H., Doubuloz,~N., and Kovrazhkin, R A.: On spatial and temporal structures in the cusp, J. Geophys. Res., 104, 28 411–28 421, 1999.

Tsyganenko, N A.: A magnetospheric magnetic field model with a warped tail plasma sheet, Planet. Space Sci., 37, 5–20, 1989.

Vasyli\=unas, V. M.: Multiple-branch model of the open magnetopause, Geophys. Res. Lett., 22, 1145–1147, 1995.

Weimer, D. R.: Maps of ionospheric field-aligned currents as a function of the interplanetary magnetic field derived from Dynamics Explorer 2 data, J. Geophys. Res., 106, 12 889–12 902, 2001.

Wild, J A., Cowley, S W H., Davies, J A., Khan,~H., Milan, S E., Provan,~G., Yeoman, T K., Balogh,~A., Dunlop, M W., Fornaçon, K.-H., and Georgescu,~E.: First simultaneous observations of flux transfer events at the high-latitude magnetopause by the Cluster spacecraft and pulsed radar signatures in the conjugate ionosphere by the CUTLASS and EISCAT radars, Ann. Geophys., 19, 1491–1508, 2001.

Zmuda, A J., Martin, J H., and Heuring, F T.: Transverse magnetic disturbances at 1100 km in the auroral region, J. Geophys. Res., 71, 5033–5045, 1966.