Axford, W. I.: Viscous interaction between the solar wind and the Earth's
magnetosphere, Planet. Space Sci., 12, 45–53,
https://doi.org/10.1016/0032-0633(64)90067-4, 1964.
Bythrow, P. F., Potemra, T. A., and Zanetti, L. J.: Variation of the auroral
Birkeland current pattern associated with the north–south component of the
IMF, in: Magnetospheric Currents, GM, AGU, Washington D.C., 131–136,
https://doi.org/10.1029/GM028p0131, 1984.
Bythrow, P. F. and Potemra, T. A.: Birkeland currents and energetic
particles associated with optical auroral signatures of a westward traveling
surge, J. Geophys. Res., 92, 8691–8699,
https://doi.org/10.1029/JA092iA08p08691, 1987.
Chertok, I. M., Belov, A. V., and Abunin, A. A.: Solar eruptions, Forbush
decreases, and geomagnetic disturbances from outstanding active region
12673, Space Weather, 16, 1549–1560, https://doi.org/10.1029/2018SW001899,
2018.
Christiansen, F., Papitashvili, V. O., and Neubert, T.: Seasonal variations
of high-latitude field-aligned currents inferred from Ørsted and Magsat
observations, J. Geophys. Res., 107, SMP 5-1–SMP 5-13,
https://doi.org/10.1029/2001JA900104, 2002.
Clausen, L. B. N., Baker, J. B. H., Ruohoniemi, J. M., Milan, S. E., Coxon,
J. C., Wing, S., Ohtani, S., and Anderson, B. J. : Temporal and spatial dynamics of the regions 1 and
2 Birkeland currents during substorms, J. Geophys. Res., 118, 3007–3016,
https://doi.org/10.1002/jgra.50288, 2013.
Clilverd, M. A., Rodger, C. J., Brundell, J. B., Dalzell, M., Martin, I.,
Mac-Manus, D. H., Thomson, N. R.,
Petersen, T., and Obana, Y.: Long-lasting geomagnetically induced currents and
harmonic distortion observed in New Zealand during the 7–8 September 2017
disturbed period, Space Weather, 16,
704–717, https://doi.org/10.1029/2018SW001822, 2018.
Cowley, S. W. H.: Magnetosphere-ionosphere interactions: A tutorial review,
in Magnetospheric Current Systems, Geophys. Monogr. Ser., 118, 91–106, AGU,
Washington, D. C., https://doi.org/10.1029/GM118p0091, 2000.
Coxon, J. C., Milan, S. E., Clausen, L. B. N., Anderson, B. J., and Korth,
H.: A superposed epoch analysis of the regions 1 and 2 Birkeland currents
observed by AMPERE during substorms, J. Geophys. Res.-Space, 119,
9834–9846, https://doi.org/10.1002/2014JA020500, 2014.
Curto, J. J., Marsal, S., Blanch, E., and Altadill, D.: Analysis of the
solar flare effects of 6 September 2017 in the ionosphere and in the Earth's
magnetic field using spherical elementary current systems, Space
Weather, 16, 1709–1720, https://doi.org/10.1029/2018SW001927, 2018.
Dungey, J. W.: Interplanetary magnetic fields and the auroral zones, Phys.
Rev. Lett., 6, 47–48, https://doi.org/10.1103/PhysRevLett.6.47, 1961.
Dunlop, M. W., Yang, Y.-Y., Yang J.-Y., Lühr, H., Shen, C., Olsen, N., Ritter, P., Zhang, Q.-H., Cao, J.-B., Fu, H.-S., and Haagmans, R.:
Multispacecraft current estimates at swarm, J. Geophys. Res.-Space,
120, 8307–8316, https://doi.org/10.1002/2015JA021707, 2015.
Elphic, R. C., Bonnell, J. W., Strangeway, R. J., Kepko, L., Ergun, R. E.,
McFadden, J. P., Carlson, W.
Peria, C. W., Cattell, C. A., Klumpar, D., Shelley, E., Peterson, W., Moebius, E., Kistler, L., and Pfaff, R.: The auroral current circuit and field-aligned currents observed by
FAST, Geophys. Res. Lett., 25, 2033–2036,
https://doi.org/10.1029/98GL01158, 1998.
ESA: ESA Swarm Data Access, Level 2 daily, available at:
https://earth.esa.int/web/guest/swarm/data-access (last access:
1 December 2019), 2018.
Friis-Christensen, E., Luhr, H., Knudsen, D., and Haagmans, R.:
Swarm – An
Earth observation mission investigating geospace, Adv. Space Res., 41,
210–216, https://doi.org/10.1016/j.asr.2006.10.008, 2008.
Fujii, R., Fukunishi, H., Kokubun, S., Sugiura, M., Tohyama, F., Hayakawa,
H., Tsuruda K., and
Okada, T.: Field-aligned currents signatures during the March 13–14, 1989,
great magnetic storm, J. Geophys. Res., 97, 10703–10715,
https://doi.org/10.1029/92JA00171, 1992.
Fukunishi, H., Fujii, R., Kokubun, S., Tohyama, F., Mukai, T., and Oya, H.:
Small-scale field-aligned currents observed by the Akebono (EXOS-D)
satellite, Geophys. Res. Lett., 18, 297–300, https://doi.org/10.1029/91GL00036, 1991.
Ganushkina, N. Y., Liemohn, M. W., Dubyagin, S., Daglis, I. A., Dandouras, I., De Zeeuw, D. L., Ebihara, Y., Ilie, R., Katus, R., Kubyshkina, M., Milan, S. E., Ohtani, S., Ostgaard, N., Reistad, J. P., Tenfjord, P., Toffoletto, F., Zaharia, S., and Amariutei, O.: Defining and resolving current systems in geospace, Ann. Geophys., 33, 1369–1402, https://doi.org/10.5194/angeo-33-1369-2015, 2015.
Gjerloev, J. W., Ohtani, S., Iijima, T., Anderson, B., Slavin, J., and Le, G.: Characteristics of the terrestrial field-aligned current system, Ann. Geophys., 29, 1713–1729, https://doi.org/10.5194/angeo-29-1713-2011, 2011.
Green, D. L., Waters, C. L., Anderson, B. J., and Korth, H.: Seasonal and interplanetary magnetic field dependence of the field-aligned currents for both Northern and Southern Hemispheres, Ann. Geophys., 27, 1701–1715, https://doi.org/10.5194/angeo-27-1701-2009, 2009.
Iijima, T. and Potemra, T. A.: The amplitude distribution of field-aligned
currents at northern high latitudes observed by Triad, J. Geophys. Res.,
81, 2165–2174, https://doi.org/10.1029/JA081i013p02165, 1976.
Iijima, T. and Potemra, T.: Large-scale distribution of field-aligned
currents associated with substorms, J. Geophys. Res., 83, 599–615,
https://doi.org/10.1029/JA083iA02p00599, 1978.
Iijima, T., Potemra, T. A., Zanetti, L. J., and Bythrow, P. F.: Large-Scale
Birkeland Currents in the Dayside Polar Region During Strongly Northward
IMF: A New Birkeland Current System, J. Geophys. Res., 89, 7441–7452,
https://doi.org/10.1029/JA089iA09p07441, 1984.
Janhunen, P., Olsson, A., Amm, O., and Kauristie, K.: Characteristics of a stable arc based on FAST and MIRACLE observations, Ann. Geophys., 18, 152–160, https://doi.org/10.1007/s00585-000-0152-5, 2000.
Johnson, M. L., Murphree, J. S., Marklund, G. T., and Karlsson, T.: Progress
on relating optical auroral forms and electric field patterns, J. Geophys.
Res., 103, 4271–4284, https://doi.org/10.1029/97JA00854, 1998.
Juusola, L., Kauristie, K., Vanhamaki, H., Aikio, A., and van de Kamp, M.:
Comparison of auroral ionospheric and field-aligned currents derived from
Swarm and ground magnetic field measurements, J. Geophys. Res.-Space,
121, 9256–9283, https://doi.org/10.1002/2016JA022961, 2016.
Kozlovsky, A., Aikio, A., Turunen, T., Nilsson, H., Sergienko, T.,
Safargaleev, V., and Kauristie, K.: Dynamics and electric currents of
morningside Sun-aligned auroral arcs, J. Geophys. Res., 112, A06306,
https://doi.org/10.1029/2006JA012244, 2007.
Knudsen, D., Burchill, J. K., Berg, K., Cameron, T., Enno, G. A.,
Marcellus, C. G., King, E. P., and
Wevers, I.: A low energy charged particle distribution imager
with a compact sensor for space applications, Rev. Sci. Instrum., 74,
202–211, https://doi.org/10.1063/1.1525869, 2003.
Luhr, H., Park, J., Gjerloev, J. W., Rauberg, J., Michaelis, I., Merayo, J.
M. G., and Brauer, P.: Field-aligned currents' scale analysis performed with
the Swarm constellation, Geophys. Res. Lett., 42, 1–8,
https://doi.org/10.1002/2014GL062453, 2015.
Lühr, H., Huang, T., Wing, S., Kervalishvili, G., Rauberg, J., and Korth, H.: Filamentary field-aligned currents at the polar cap region during northward interplanetary magnetic field derived with the Swarm constellation, Ann. Geophys., 34, 901–915, https://doi.org/10.5194/angeo-34-901-2016, 2016.
Lui, A. T. Y.: Current disruption in the Earth's magnetosphere: Observations
and models, J. Geophys. Res., 101, 13067–13088,
https://doi.org/10.1029/96JA00079, 1996.
Lukianova, R. and Kozlovsky, A.: Dynamics of polar boundary of the
auroral oval derived from the IMAGE satellite data, Cosmic Res., 51,
46–53, https://doi.org/10.1134/S0010952513010061, 2013.
Lukianova, R. Yu., Kozlovskii, A., and Christiansen, F.: field-aligned
currents in the winter and summer hemispheres caused by IMF
By, Geomagn. Aeronomy, 52, 300–308,
https://doi.org/10.1134/S0016793212020089, 2012.
Lyons, L. R.: Formation of auroral arcs via magnetosphere-ionosphere
coupling, Rev. Geophys., 30, 93–112,
https://doi.org/10.1029/92RG00002, 1992.
Marchaudon, A., Cerisier, J.-C., Greenwald, R. A., and Sofko, G. J.:
Electrodynamics of a flux transfer event: Experimental test of the Southwood
model, Geophys. Res. Lett., 31, L09809,
https://doi.org/10.1029/2004GL019922, 2004.
Marchaudon, A., Cerisier, J.-C., Bosqued, J.-M., Owen, C. J., Fazakerley, A. N., and Lahiff, A. D.: On the structure of field-aligned currents in the mid-altitude cusp, Ann. Geophys., 24, 3391–3401, https://doi.org/10.5194/angeo-24-3391-2006, 2006.
Marklund, G., Sandahl, I., and Opgenoorth, H.: A study of the dynamics of a
discrete auroral arc, Planet. Space Sci., 30, 179–197,
https://doi.org/10.1016/0032-0633(82)90088-5, 1982.
McGranaghan, R. M., Mannucci, A. J., and Forsyth, C.: A comprehensive
analysis of multiscale field-aligned currents: Characteristics, controlling
parameters, and relationships, J. Geophys. Res.-Space, 122,
11931–11960, https://doi.org/10.1002/2017JA024742, 2017.
Meng, C.-I.: Dynamic variation of the auroral oval during intense magnetic
storms, J. Geophys. Res., 89, 227–235,
https://doi.org/10.1029/JA089iA01p00227, 1984.
Merayo, J. G. M., Jorgensen, J. L., Friis-Christensen, E., Brauer, P.,
Primdahl, F., Jorgensen, P. S., Allin, T. H., and Denver, T.: The Swarm Magnetometry Package, in: Small Satellites for Earth
Observation, edited by: Sandau, R., Röser, H. P., and Valenzuela, A., Springer, Dordrecht, 143–151,
https://doi.org/10.1007/978-1-4020-6943-7_13, 2008.
Milan, S. E., Cowley, W. H., Lester, M., Wright, D. M., Slavin, J. A.,
Fillingim, M., Carlson, C. W., and Singer, H. J.: Response of the
magnetotail to changes in the open flux content of the magnetosphere, J.
Geophys. Res., 109, A04220,
https://doi.org/10.1029/2003JA010350, 2004.
Milan, S. E.: Both solar wind-magnetosphere coupling and ring current
intensity control of the size of the auroral oval, Geophys. Res.
Lett., 36, L18101, https://doi.org/10.1029/2009GL039997, 2009.
Milan, S. E., Hutchinson, J., Boakes, P. D., and Hubert, B.: Influences on the radius of the auroral oval, Ann. Geophys., 27, 2913–2924, https://doi.org/10.5194/angeo-27-2913-2009, 2009.
Neubert, T. and Christiansen, F.: Small-scale, field-aligned currents at
the top-side ionosphere, Geophys. Res. Lett., 30, 2010,
https://doi.org/10.1029/2003GL017808, 2003.
Opgenoorth, H. J., Haggstrom, I., Williams, P. J. S., and Jones, G. O. L.:
Regions of strongly enhanced perpendicular electric fields adjacent to
auroral arcs, J. Atmos. Terr. Phys., 52, 449–458,
https://doi.org/10.1016/0021-9169(90)90044-N, 1990.
Papitashvili, V. O., Christiansen, F., and Neubert, T.: A new model of
field-aligned currents derived from high-precision satellite magnetic field
data, Geophys. Res. Lett., 29, 1683,
https://doi.org/10.1029/2001GL014207, 2002.
Potemra, T. A., Zanetti, L. J., Bythrow, P. F., and Lui, A. T. Y.:
By-dependent convection patterns during northward interplanetary magnetic
field, J. Geophys. Res., 89, 9753, https://doi.org/10.1029/JA089iA11p09753,
1984.
Pu, Z. Y., Raeder, J., Zhong, J., Bogdanova, Y. V., Dunlop, M., Xiao, C. J.,
Wang, X. G., and Fazakerley, A.: Magnetic topologies of an in vivo FTE
observed by Double Star/TC-1 at Earth's magnetopause, Geophys. Res. Lett.,
40, 3502–3506, https://doi.org/10.1002/grl.50714, 2013.
Ridley, A. J.: Effects of seasonal changes in the ionospheric conductances on
magnetospheric field-aligned currents, Geophys. Res. Lett., 34, L05101,
https://doi.org/10.1029/2006GL028444, 2007.
Ritter, P. and Lühr, H.: Curl-B technique applied to Swarm
constellation for determining field-aligned currents, Earth Planets Space,
58, 463–476, https://doi.org/10.1186/BF03351942, 2006.
Ritter, P. and Lühr, H.: Near-Earth magnetic signature of magnetospheric substorms and an improved substorm current model, Ann. Geophys., 26, 2781–2793, https://doi.org/10.5194/angeo-26-2781-2008, 2008.
Ritter, P., Lühr, H., and Rauberg, J.: Determining field-aligned
currents with the Swarm constellation mission, Earth Planets Space, 65,
1285–1294, https://doi.org/10.5047/eps.2013.09.006, 2013.
Southwood, D. J.: The ionospheric signature of flux transfer events, J.
Geophys. Res., 92, 3207–3213,
https://doi.org/10.1029/JA092iA04p03207, 1987.
Swarm Level 2 Processing System: Product specification for L2 Products and Auxiliary Products, available at:
https://earth.esa.int/documents/10174/1514862/Swarm_L2_Product_specification, last access: 12
December 2019.
Vennerstrøm, S., Moretto, T., Olsen, N., Friis-Christensen, E., Stampe,
A. M., and Watermann, J. F.: Field-aligned currents in the dayside cusp and
polar cap region during northward IMF, J. Geophys. Res., 107, SMP 18-1–SMP 18-5,
https://doi.org/10.1029/2001JA009162, 2002.
Wang, H., Lühr, H., Ma, S. Y., Weygand, J., Skoug, R. M., and Yin, F.: Field-aligned currents observed by CHAMP during the intense 2003 geomagnetic storm events, Ann. Geophys., 24, 311–324, https://doi.org/10.5194/angeo-24-311-2006, 2006.
Watermann, J., Stauning, P., Lühr, H., Newell, P. T., Christiansen, F., and
Schlegel, K.: Are small-scale field-aligned currents and magnetosheath-like
particle precipitation signatures of the same low-altitude cusp?, Adv. Space
Res., 43, 41–46, https://doi.org/10.1016/j.asr.2008.03.031, 2009.
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, 2889–12902, https://doi.org/10.1029/2000JA000295, 2001.
Wu, J., Knudsen, D. J., Gillies, D. M., Donovan, E. F., and Burchill, J. K.:
Swarm observation of field-aligned currents associated with multiple auroral
arc systems, J. Geophys. Res.-Space, 122, 10145–10156,
https://doi.org/10.1002/2017JA024439, 2017.
Xiong, C., Lühr, H., Wang, H., and Johnsen, M. G.: Determining the boundaries of the auroral oval from CHAMP field-aligned current signatures – Part 1, Ann. Geophys., 32, 609–622, https://doi.org/10.5194/angeo-32-609-2014, 2014.
Yasyukevich, Yu., Astafyeva, E., Padokhin, A., Ivanova, V., Syrovatskii, S.,
and Podlesnyi, A.: The 6 September 2017 X-class solar flares and their
impacts on the ionosphere, GNSS and HF radio wave propagation, Space
Weather, 16, 1013–1027, https://doi.org/10.1029/2018SW001932, 2018.
Yokoyama, N., Kamide, Y., and Miyaoka, H.: The size of the auroral belt during magnetic storms, Ann. Geophys., 16, 566–573, https://doi.org/10.1007/s00585-998-0566-z, 1998.
