In-situ evidence for the IMF-induced tail twisting in association with interhemispheric displacement of conjugate auroras

Details In-situ evidence for the IMF-induced tail twisting in association with interhemispheric displacement of conjugate auroras In-situ evidence for the IMF-induced tail twisting in association with interhemispheric displacement of conjugate auroras

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm41c1879m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM41C-1879

Physics

[2704] Magnetospheric Physics / Auroral Phenomena, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [2790] Magnetospheric Physics / Substorms

Scientific paper

We provide in-situ evidence for twisting near-Earth tail configuration, responsible for time sequence of the conjugate auroral features with the relative interhemispheric displacement during a weak substorm reported by Motoba et al. [2010]. We have analyzed the magnetic field data observed with four Cluster satellites in the vicinity of the 11~14 RE central down-tail, in close conjunction with the Iceland-Syowa optical conjugate auroras. Interestingly, we found that the magnetic y-component (By) variations at all satellites were moderately correlated with the time-shifted IMF clock angle (CA) variation. The correlation coefficients (0.56~0.61) between the By field at Cluster and the IMF CA peaked at a time delay of 52+/-1 min from the dayside magnetopause, probably corresponding to timescale for the IMF CA-related By field in the near-Earth tail to reconfigure. The IMF CA-related By variation at Cluster, regarded as a manifestation of the twisting magnetotail configuration, roughly coincided also with the relative MLT displacement of the nightside conjugate auroral forms. These results strongly support that the reconfiguration (twisting) process of the near-Earth tail on relatively longer timescale controls the conjugate auroral locations observed in both ionospheres.

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