Abstract
Magnetic merging is a primary means for coupling energy from the solar wind into the magnetosphere-ionosphere system. The location and nature of the process remain as open questions. By correlating measurements from diverse locations and using large-scale MHD models to put the measurements in context, it is possible to constrain our interpretations of the global and meso-scale dynamics of magnetic merging. Recent evidence demonstrates that merging often occurs at high latitudes in the vicinity of the cusps. The location is in part controlled by the clock angle in the interplanetary magnetic field (IMF) Y-Z plane. In fact, B Y bifurcates the cusp relative to source regions. The newly opened field lines may couple to the ionosphere at MLT locations of as much as 3 hr away from local noon. On the other side of noon the cusp may be connected to merging sites in the opposite hemisphere. In fact, the small convection cell is generally driven by opposite hemisphere merging. B X controls the timing of the interaction and merging sites in each hemisphere, which may respond to planar features in the IMF at different times. Correlation times are variable and are controlled by the dynamics of the tilt of the interplanetary electric field phase plane. The orientation of the phase plane may change significantly on time scales of tens of minutes. Merging is temporally variable and may be occurring at multiple sites simultaneously. Accelerated electrons from the merging process excite optical signatures at the foot of the newly opened field lines. All-sky photometer observations of 557.7 nm emissions in the cusp region provide a “television picture” of the merging process and may be used to infer the temporal and spatial variability of merging, tied to variations in the IMF.
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Aggson, T. L., Maynard, N. C., Ogilvie, K. W., Scudder, J. D., and Gambardella, P. J.: 1984. Observations of Plasma Deceleration at a Rotational Magnetopause Discontinuity, Geophys. Res. Lett. 11, 8.
Atkinson, G.: 1992. Mechanism by Which Merging at X-lines Causes Discrete Auroral Arcs, J. Geophys. Res. 97, 1337.
Birn, J., Drake, J. F., Shay, M. A., Rogers, B. N., Denton, R. E., Hesse, M., Kuznetsova, M., Ma, Z. W., Bhattacharjee, A., Otto, A., and Pritchett, P. L.: 2001. Geospace Environmental Modeling (GEM) Magnetic Reconnection Challenge, J. Geophys. Res. 106, 3715.
Coleman, I. J., Chisham, G., Pinnock, M., and Freeman, M. P.: 2001. An Ionospheric Convection Signature of Antiparallel Reconnection, J. Geophys. Res. 106, 28,995.
Cowley, S. W. H.: 1982. The Causes of Convection in the Earth’s Magnetosphere: A Review of Developments During the IMS, Rev. Geophys. Space Phys. 20, 531.
Cowley, S. W. H., and Owen, C. J.: 1989. A Simple Illustrative Model of Open Flux Tube Motion Over the Dayside Magnetopause, Planet. Space Sci. 37, 1461.
Cowley, S. W.H., and Lockwood, M.: 1992. Excitation and Decay of Solar Wind Driven Flows in the Magnetosphere-Ionosphere System, Ann. Geophys. 10, 103.
Crooker, N. U.: 1979. Dayside Merging and Cusp Geometry, J. Geophys. Res. 84, 951.
Dungey, J. W.: 1961. Interplanetary magnetic field and the auroral zones, Phys. Rev. Lett. 6, 47.
Dunlop, M. W., Balogh, A., Glassmeier, K.-H., and Robert, P.: 2002. Four-Point Cluster Application of Magnetic Field Analysis Tools the Curlometer, J. Geophys. Res. 107(A11), 1384doi10.1029/2001JA005088.
Gonzalez, W. D., and Mozer, F. S.: 1974. A Quantitative Model for the Potential Resulting from Reconnection with Arbitrary Interplanetary Magnetic Field, J. Geophys. Res. 79, 4186.
Gosling, J. T., Asbridge, J. R., Bame, S. J., Feldman, W. C., Paschmann, G., Sckopke, N., and Russell, C. T.: 1982. Evidence for Quasi-Stationary Reconnection at the Dayside Magnetopause, J. Geophys. Res. 87, 2147.
Fasel, G. J.: 1995. Dayside Poleward Moving Auroral Forms, A Statistical Study, J. Geophys. Res. 100, 11,891.
Frey, H. U., Mende, S. B., Fuselier, S. A., Immel, T. J., and Ostgaard, N.: 2003. Proton Aurora in the Cusp During Southward IMF, J. Geophys. Res. 108(A7), 1277doi10.1029/ 2003JA009861.
Haerendel, G., Paschmann, G., Sckopke, N., Rosenbauer, H., and Hedgecock, P. C.: 1978. The Frontside Boundary Layer of the Magnetosphere and the Problem of Reconnection, J. Geophys. Res. 83, 3195.
Hain, K.: 1987. The Partial Donor Cell Method, J. Comput. Phys. 73, 131.
Kawano, H., and Higuchi, T.: 1995. The Bootstrap Method in Space Physics Error Estimation for Minimum Variance Analysis, Geophys. Res. Lett. 22, 307.
Keith, W. R., Winningham, J. D., Goldstein, M. L., Wilber, M., Fazakerley, A. N., Reme, H., Fritz, T. A., Balogh, A., Cornilleau-Wehrlin, N., and Maksimovic, M.: 2005, Observations of a Unique Cusp Signature at Low and Mid Altitudes, Surveys in Geophys., this volume.
Lemaire, J.: 1977. Impulsive Penetration of Filamentary Plasma Elements into the Magnetospheres of Earth and Jupiter, Planet. Space Sci. 25, 887.
Levy, R. H., Petschek, H. E., and Siscoe, G. L.: 1964. Aerodynamic Aspects of Magnetospheric Flow, AIAA J. 2, 2065.
Lockwood, M.: 1994. Ionospheric Signatures of Pulsed Magnetopause Reconnection, in J. A. Holtet, and A. Egeland (eds.), Physical Signatures of Magnetospheric Boundary Layer Processes, Kluwer Academic Publishers, The Netherlands, pp. 229.
Lockwood, M., Lanchester, B. S., Frey, H. U., Thorp, K., Morley, S. K., Milan, S. E., and Lester, M.: 2003. IMF Control of Cusp Proton Emission Intensity and Dayside Convection Implications for Component and Anti-Parallel Reconnection, Ann. Geophys. 21, 955.
Luhmann, J. G., Walker, R. J., Russell, C. T., Crooker, N. U., Spreiter, J. R., and Stahara, S.: 1984. Patterns of Potential Magnetic Field Merging Sites on the Dayside Magnetopause, J. Geophys. Res. 89, 1739.
Ma, Z. W., and Bhattacharjee, A.: 2001. Hall Magnetohydrodynamic Reconnection the Geospace Environment Modeling Challenge, J. Geophys. Res. 106, 3773.
Ma, Z. W., Scudder, J. D., and Omidi, N.: 2002, The Achilles Heel of Normal Determinations via Minimum Variance Techniques Worldline Dependencies, EOS Trans. AGU 83(47), Fall Meet. Suppl., Abstract SM11B-0433.
Maynard, N. C.: 2003, Svalbard: A Window for Understanding Temporal/Spatial Aspects of Solar Wind Coupling to the Magnetosphere and Ionsphere, in J. Moen and J. A. Holtet (eds), Egeland Symposium on Auroral and Atmospheric Research, ISBN 82-91853-09-6, Department of Physics, University of Oslo, pp. 75.
Maynard, N. C., and Johnstone, A. D.: 1974. High-Latitude Dayside Electric Field and Particle Measurements, J. Geophys. Res. 79, 3111.
Maynard, N. C., Burke, W. J., Denig, W. F., and Basinska, E. M.: 1994. Signatures and Sources of Electric Fields and Particles at Dayside High Latitudes, in J. A. Holtet, and A. Egeland (eds.), Physical Signatures of Magnetospheric Boundary Layer Processes, Kluwer Academic Publishers, The Netherlands, pp. 59.
Maynard, N. C., Denig, W. F., and Burke, W. J.: 1995. Mapping of Ionospheric Convection Patterns to the Magnetosphere, J. Geophys. Res. 100, 1713.
Maynard, N. C., Weber, E. J., Weimer, D. R., Moen, J., Onsager, T., Heelis, R. A., and Egeland, A.: 1997. How Wide in Magnetic Local Time is the Cusp? An Event Study, J. Geophys. Res. 102, 4765.
Maynard, N. C., Burke, W. J., Pfaff, R. F., Weber, E. J., Ober, D. M., Weimer, D. R., Moen, J., Milan, S., Sandholt, P. E., Egeland, A., Søraas, F., Lepping, R., Bounds, S., Acuña, M. H., Freudenreich, H., Gentile, L. C., Hardy, D. A., Holtet, J. A., Lester, M., Machuzak, J. S., Clemmons, J. H., Ning, P., Stadsnes, J., and van Eyken, T.: 2000. Driving Dayside Convection with Northward IMF Observations by a Sounding Rocket Launched from Svalbard, J. Geophys. Res. 105, 5245.
Maynard, N. C., Savin, S., Erickson, G. M., Kawano, H., Nemecek, Z., Peterson, W. K., Safrànková, J., Sandahl, I., Scudder, J. D., Siscoe, G. L., Sonnerup, B. U.Ö., Weimer, D. R., White, W. W., and Wilson, G. R.: 2001a. Observation of the Magnetospheric “Sash” and Its Implications Relative to Solar-Wind/Magnetospheric Coupling: A Multisatellite Event Analysis, J. Geophys. Res. 106, 6097.
Maynard, N. C., Siscoe, G. L., Sonnerup, B. U.Ö., White, W. W., Siebert, K. D., Weimer, D. R., Erickson, G. M., Schoendorf, J. A., Ober, D. M., and Wilson, G. R.: 2001b. The Response of Ionospheric Convection to Changes in the IMF: Lessons from a MHD Simulation, J. Geophys. Res. 106, 21,429.
Maynard, N. C., Burke, W. J., Sandholt, P. E., Moen, J., Ober, D. M., Lester, M., Weimer, D. R., and Egeland, A.: 2001c. Observations of Simultaneous Effects of Merging in Both Hemispheres, J. Geophys. Res. 106, 24,551.
Maynard, N. C., Burke, W. J., Moen, J., Sandholt, P. E., Lester, M., Ober, D. M., Weimer, D. R., and White, W. W.: 2002. Bifurcation of the Cusp: Implications for Understanding Boundary Layers, in P. T. Newell, and T. Onsager (eds.), Earth’s Low-Latitude Boundary Layer, Geophys. Mon. 133, Am. Geophys. Union, Washington, DC, pp. 319.
Maynard, N. C., Ober, D. M., Burke, W. J., Scudder, J. D., Lester, M., Dunlop, M., Wild, J. A., Grocott, A., Farrugia, C. J., Lund, E. J., Russell, C. T., Weimer, D. R., Siebert, K. D., Balogh, A., Andre, M., and Reme, H.: 2003. Polar, Cluster and SuperDARN Evidence for High Latitude Merging During Southward IMF: Temporal/Spatial Evolution, Annales Geophys. 21, 2233.
Newell, P. T., and Sibeck, D. G.: 1994. Magnetosheath Fluctuations, Ionospheric Convection and Dayside Ionospheric Transients, in J. A. Holtet, and A. Egeland (eds.), Physical Signatures of Magnetospheric Boundary Layer Processes, Kluwer Academic Publishers, The Netherlands, pp. 245.
Paschmann, G., Sonnerup, B. U. Ö., Papamastorakis, I., Skopke, N., Haerendel, G., Bame, S. J., Asbridge, J. R., Gosling, J. T., Russell, C. T., and Elphic, R. C.: 1979. Plasma Acceleration at the Earth’s Magnetopause Evidence for Reconnection, Nature 282, 243.
Paschmann, G., Papamastorakis, I., Baumjohann, W., Sckopke, N., and Lühr, H.: 1986. J. Geophys. Res. 91, 11,099.
Phan, T., Frey, H. U., Frey, S., Peticolas, L., Fuselier, S., Carlson, C., Reme, H., Bosqued, J.-M., Balogh, A., Dunlop, M., Kistler, L., Moukis, C., Dandouras, I., Sauvaud, J.-A., Mende, S., McFadden, J., Parks, G., Moebius, E., Klecker, B., Paschmann, G., Fujimoto, M., Petrinec, S., Marcucci, M. F., Korth, A., and Lundin, R.: 2003. Simultaneous Cluster and IMAGE Observations of Cusp Reconnection and Auroral Proton Spot for Northward IMF, Geophys. Res. Lett. 30(10), 1509doi10.1029/2003GL016885.
Rodger, A. S., Coleman, I. J., and Pinnock, M.: 2000. Some Comments on Transient and Steady-State Reconnection at the Dayside Magnetopause, Geophys. Res. Lett. 27, 1359.
Russell, C. T., and Elphic, R. C.: 1979. ISEE Observations of Flux Transfer Events at the Dayside Magnetopause, Geophys. Res. Lett. 6, 33.
Sandholt, P. E., Deehr, C. S., Egeland, A., Lybekk, B., Viereck, R., and Romick, G. J.: 1986. Signatures in the Dayside Aurora of Plasma Transfer from the Magnetosheath, J. Geophys. Res. 91, 10063.
Sandholt, P. E., Farrugia, C. J., Moen, J., Noraberg, Ø, Lybekk, B., Sten, T., and Hansen, T.: 1998. A Classification of Dayside Auroral forms and Activities as a Function of Interplanetary Magnetic Field Orientation, J. Geophys. Res. 103, 22,325.
Savin, S., Büchner, J., Consolini, G., Nikutowski, B., Zelenyi, L., Amata, E., Auster, H. U., Blecki, J., Dubinin, E., Fornacon, K. H., Kawano, H., Klimov, S., Marcucci, F., Nemecek, Z., Pedersen, A., Rauch, J. L., Romanov, S., Safrankova, J., Sauvaud, J. A., Skalsky, A., Song, P., and Yermolaev, Yu.: 2002. On the Properties of Turbulent Boundary Layer Over Polar Cusps, Nonlinear Processes in Geophys. 9, 443.
Savin, S., Zelenyi, L., Romanov, S., Sandahl, I., Pickett, J., Amata, E., Avanov, L., Blecki, J., Budnik, E., Buchner, J., Cattell, C., Consolini, G., Fedder, J., Kawano, H., Klimov, S., Korepanov, V., Lagoutte, D., Marcucci, F., Mogilevsky, M., Nemecek, Z., Nikutowski, B., Nozdrachev, M., Parrot, M., Rauch, J. L., Romanov, V., Romantsova, T., Russell, C. T., Safrankova, J., Sauvaud, J. A., Skalsky, A., Smirnov, V., Stasiewicz, K., Trotignon, J. G., and Yermolaev Yu.: 2004, Magnetosheath-Cusp Interface, Annales Geophys. 22, 183.
Scudder, J. D.: 1984. Fluid Signatures of Rotational Discontinuities, J. Geophys. Res. 89, 7431.
Scudder, J. D.: 1997. Theoretical Approaches to the Description of Magnetic Merging the Need for Finite βe, Anisotropic Ambipolar Hall MHD, Space Sci. Rev. 80, 235.
Scudder, J. D., Puhl-Quinn, P. A., Mozer, F. S., Ogilvie, K. W., and Russell, C. T.: 1999. Generalized Walén Tests Through Alfvén Waves and Rotational Discontinuities using Electron Velocities, J. Geophys. Res. 104, 19,817.
Scudder, J. D., Mozer, F. S., Maynard, N. C., and Russell, C. T.: 2002a. Fingerprints of Collisionless Reconnection at the Separator: I, Ambipolar-Hall Signatures, J. Geophys. Res. 107(A10), 1294doi10.1029/2001JA000126.
Scudder, J. D., Maynard, N., Ober D., and Mozer, F.: 2002b, Ambipolar Electric Fields Parallel and Perpendicular to the Local Magnetic Field: at Magnetopause and Depletion Layers, EOS Trans. AGU 83(47), Fall Meet. Suppl., Abstract SM21B-04.
Shepherd, S. G., Greenwald, R. A., and Ruohoniemi, J. M.: 1999. A Possible Explanation for Rapid, Large-Scale Ionospheric Responses to Southward Turnings of the IMF, Geophys. Res. Lett. 26, 3197.
Sibeck, D. G., and Newell, P. T.: 1994. Concerning the Location of Magnetopause Merging, in J. A. Holtet, and A.. Egeland (eds.), Physical Signatures of Magnetospheric Boundary Layer Processes, Kluwer Academic Publishers, The Netherlands, pp. 263.
Siscoe, G. L., Crooker, N. U., Erickson, G. M., Sonnerup, B. U. Ö., Siebert, K. D., Weimer, D. R., White, W. W., and Maynard, N. C.: 2000a, Global Geometry of Magnetospheric Currents Inferred from MHD Simulations, in Magnetospheric Current Systems, Geophysical Monograph 118. American Geophysical Union, Washington, DC, pp 41.
Siscoe, G. L., Erickson, G. M., Sonnerup, B. U. Ö., Maynard, N. C., Siebert, K. D., Weimer, D. R., and White, W. W.: 2000b. Deflected Magnetosheath Flow at High-Latitude Magnetopause, J. Geophys. Res. 105, 12,851.
Siscoe, G. L., Erickson, G. M., Sonnerup, B. U. Ö., Maynard, N. C., Schoendorf, J. A., Siebert, K. D., Weimer, D. R., White, W. W., and Wilson, G. R.: 2002a, Flow-Through Magnetic Reconnection, Geophys. Res. Lett. 29(13), 10.1029/2001GL013536.
Siscoe, G. L., Erickson, G. M., Sonnerup, B. U. Ö., Maynard, N. C., Schoendorf, J. A., Siebert, K. D., Weimer, D. R., White, W. W., and Wilson, G. R.: 2002b. MHD Properties of Magnetosheath Flow, Planet. Space Sci. 50, 461.
Siscoe, G. L., Siebert, K. D., Crooker, N. U., Maynard, N. C., Weimer, D. R., and White, W. W.: 2005, Cusp Geometry in MHD Simulations, Surveys in Geophys., this volume.
Sonnerup, B. U. Ö.: 1974. Magnetopause Reconnection Rate, J. Geophys. Res. 79, 1546.
Sonnerup, B. U. Ö., and Ledley, B. G.: 1974. Magnetopause Rotational Forms, J. Geophys. Res. 79, 4309.
Sonnerup, B. U. Ö., Paschmann, G., Papamastorakis, I., Sckopke, N., Haerendel, G., Bame, S. J., Asbridge, J. R., Gosling, J. T., and Russell, C. T.: 1981. Evidence for Magnetic Reconnection at the Earth’s Magnetopause, J. Geophys. Res. 86, 10,049.
Sonnerup, B. U. Ö., Papamastorakis, I., Paschmann, G., and Lühr, H.: 1990. The Magnetopause for High Magnetic Shear Analysis of Convection Electric Fields from AMPTE/IRM, J. Geophys. Res. 95, 10,451.
Tsyganenko, N. A., and Stern, D. P.: 1996. Modeling the Global Magnetic Field of the Large-Scale Birkeland Current Systems, J. Geophys. Res. 101, 27,187.
Weimer, D. R.: 2001. An Improved Model of Ionospheric Electric Potentials Including Substorm Perturbations and Application to the GEM November 24, 1996 Event, J. Geophys. Res. 106, 407.
Weimer, D. R., Ober, D., Maynard, N. C., Burke, W. J., Collier, M. R., McComas, D. J., Ness, N. F., and Smith, C. W.: 2002, Variable Time Delays in the Propagation of the Interplanetary Magnetic Field, J. Geophys. Res. 107(A8), 10.1029/2001JA009102.
White, W. W., Siscoe, G. L., Erickson, G. M., Kaymaz, Z., and Maynard, N.C., Siebert, K. D., Sonnerup, B. U. Ö., and Weimer, D. R. 1998 The Magnetospheric Sash and Cross-Tail SGeophys. Res. Lett. 251605.
White, W. W., Schoendorf, J. A., Siebert, K. D., Maynard, N. C., Weimer, D. R., Wilson, G. L., Sonnerup, B. U. Ö., Siscoe, G. L., and Erickson, G. M.: 2001. MHD Simulation of Magnetospheric Transport at the Mesoscale, in Paul Song, Howard J. Singer, and George Siscoe (eds.), Space Weather, Geophysical Monograph Series, Volume 125, American Geophysical Union, Washington, DC, pp. 229.
Wing, S., Newell, P. T., and Ruohoniemi, J. M.: 2001. Double Cusp Model Prediction and Observational Verification, J. Geophys. Res. 106, 25,571.
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Maynard, N.C. (2005). Coupling the Solar-Wind/IMF to the Ionosphere Through the high Latitude Cusps. In: Fritz, T.A., Fung, S.F. (eds) The Magnetospheric Cusps: Structure and Dynamics. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3605-1_11
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