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ANGEO | Articles | Volume 38, issue 2
Ann. Geophys., 38, 467–479, 2020
https://doi.org/10.5194/angeo-38-467-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Ann. Geophys., 38, 467–479, 2020
https://doi.org/10.5194/angeo-38-467-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 07 Apr 2020

Regular paper | 07 Apr 2020

The increase in the curvature radius of geomagnetic field lines preceding a classical dipolarization

Osuke Saka

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Cited articles

Akasofu, S.-I.: Source of auroral electrons and the magnetospheric substorm current system, J. Geophys. Res., 108, 8006, https://doi.org/10.1029/2002JA009547, 2003. 
Allan, W., Menk, F. W., Fraser, B. J., Li, Y., and White, S. P.: Are low-latitude Pi2 pulsations cavity/waveguide mode?, Geophys. Res. Lett., 23, 765–768, 1996. 
Baumjohann, W.: Ionospheric and field-aligned current systems in the auroral zone: A concise review, Adv. Space Res., 2, 55–62, 1983. 
Baumjohann, W., Hesse, M., Kokubun, S., Mukai, T., Nagai, T., and Petrukovich, A. A.: Substorm dipolarization and recovery, J. Geophys. Res., 104, 24995–25000, 1999. 
Birn, J. and Hesse, M.: Details of current disruption and diversion in simulations of magnetotail dynamics, J. Geophys. Res., 101, 15345–15358, 1996. 
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The first 10 min interval of Pi2 onset is the most active period of substorms composed of field line deformations associated with an increase in curvature radius of flux tubes and their longitudinal expansion. The flux tube deformations were triggered by the ballooning instability of slow magnetoacoustic waves upon arrival of the dipolarization front from the tail. They preceded the classical dipolarization caused by the reduction of cross-tail currents and resulting pileup of the field lines.
The first 10 min interval of Pi2 onset is the most active period of substorms composed of field...
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