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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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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision
ED: Reconsider after major revisions (further review by editor and referees) (18 Nov 2019) by Elias Roussos
AR by Osuke Saka on behalf of the Authors (28 Nov 2019)  Author's response
ED: Referee Nomination & Report Request started (16 Dec 2019) by Elias Roussos
RR by Anonymous Referee #2 (05 Jan 2020)
RR by Anonymous Referee #3 (17 Jan 2020)
ED: Reconsider after major revisions (further review by editor and referees) (22 Jan 2020) by Elias Roussos
AR by Osuke Saka on behalf of the Authors (14 Feb 2020)  Author's response    Manuscript
ED: Referee Nomination & Report Request started (17 Feb 2020) by Elias Roussos
RR by Anonymous Referee #3 (29 Feb 2020)
ED: Publish subject to minor revisions (review by editor) (29 Feb 2020) by Elias Roussos
AR by Osuke Saka on behalf of the Authors (03 Mar 2020)  Author's response    Manuscript
ED: Publish as is (05 Mar 2020) by Elias Roussos
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Short summary
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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