Articles | Volume 38, issue 3
Ann. Geophys., 38, 749–764, 2020
Ann. Geophys., 38, 749–764, 2020

Regular paper 24 Jun 2020

Regular paper | 24 Jun 2020

Relation between the asymmetric ring current effect and the anti-sunward auroral currents, as deduced from CHAMP observations

Hermann Lühr and Yun-Liang Zhou

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Cited articles

Bythrow, P. F., Heelis, R. A., Hanson, W. B., Power, R. A., and Hoffman, R.: Observational evidence for a boundary layer source of dayside Region 1 field-aligned currents, J. Geophys. Res., 86, 5577–5589, 1981. 
CIRES: POMME-6CE2 geomagnetic field model, available at:, last access: 18 June 2020. 
Crooker, N. U. and Siscoe, G. L.: Birkeland Currents as the Cause of the Low-Latitude Asymmetric Disturbance Field, J. Geophys. Res., 86, 11201–11210, 1981. 
Fukushima, N.: Generalized theorem for no ground magnetic effect of vertical currents connected with Pedersen currents in the uniform-conductivity ionosphere, Rept. Ionos. Space Res. Japan, 30, 35–40, 1976. 
Guo, J., Liu, H., Feng, X., Pulkkinen, T. I., Tanskanen, E. I., Liu, C., Zhong, D., and Wang, Y.: MLT and seasonal dependence of auroral electrojets: IMAGE magnetometer network observations, J. Geophys. Res.-Space, 119, 3179–3188,, 2014. 
Short summary
During magnetic storms the magnetic disturbance at low latitudes becomes asymmetric, enhanced in the evening sector and reduced around morning. This has been attributed to the asymmetric ring current. Here a new 3D current system is proposed for explaining the asymmetric signal. Anti-sunward net currents at high latitude are connected at their noon and night ends to field-aligned currents that lead the currents to the magnetopause on the dawn and dusk flanks where the current closure occurs.