Show simple item record

dc.contributor.authorAstafyeva, E.
dc.contributor.authorZakharenkova, I.
dc.contributor.authorHozumi, K.
dc.contributor.authorAlken, P.
dc.contributor.authorCoïsson, P.
dc.contributor.authorHairston, Marc R.
dc.contributor.authorColey, William R.
dc.description.abstractWe use a set of ground-based instruments (Global Positioning System receivers, ionosondes, magnetometers) along with data of multiple satellite missions (Swarm, C/NOFS, DMSP, GUVI) to analyze the equatorial and low-latitude electrodynamic and ionospheric disturbances caused by the geomagnetic storm of 22-23 June 2015, which is the second largest storm in the current solar cycle. Our results show that at the beginning of the storm, the equatorial electrojet (EEJ) and the equatorial zonal electric fields were largely impacted by the prompt penetration electric fields (PPEF). The PPEF were first directed eastward and caused significant ionospheric uplift and positive ionospheric storm on the dayside, and downward drift on the nightside. Furthermore, about 45 min after the storm commencement, the interplanetary magnetic field (IMF) Bz component turned northward, leading to the EEJ changing sign to westward, and to overall decrease of the vertical total electron content (VTEC) and electron density on the dayside. At the end of the main phase of the storm, and with the second long-term IMF Bz southward turn, we observed several oscillations of the EEJ, which led us to conclude that at this stage of the storm, the disturbance dynamo effect was already in effect, competing with the PPEF and reducing it. Our analysis showed no significant upward or downward plasma motion during this period of time; however, the electron density and the VTEC drastically increased on the dayside (over the Asian region). We show that this second positive storm was largely influenced by the disturbed thermospheric conditions. ©2018. The Authors.
dc.description.sponsorshipEuropean Research Council (ERC, grant agreement 307998). Russian Foundation for Basic Research (RFBR) grant 16‐05‐01077. NSF grant AGS‐1552245 and NASA grant NNX‐15AT31G.
dc.publisherBlackwell Publishing Ltd
dc.rightsCC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
dc.rights©2018 The Authors
dc.subjectDynamo theory (Cosmic physics)
dc.subjectEquatorial electrojet
dc.subjectMagnetic storms
dc.subjectLower ionosphere
dc.subjectElectric fields
dc.subjectThermospheric winds
dc.titleStudy of the Equatorial and Low-Latitude Electrodynamic and Ionospheric Disturbances during the 22–23 June 2015 Geomagnetic Storm Using Ground-Based and Spaceborne Techniques
dc.description.departmentWilliam B. Hanson Center for Space Sciences
dc.identifier.bibliographicCitationAstafyeva, E., I. Zakharenkova, K. Hozumi, P. Alken, et al. 2018. "Study of the equatorial and low-latitude electrodynamic and ionospheric disturbances during the 22–23 June 2015 geomagnetic storm using ground-based and spaceborne techniques." Journal of Geophysical Research: Space Physics 123(3): 2424-2440, doi:10.1002/2017JA024981
dc.source.journalJournal of Geophysical Research: Space Physics
dc.contributor.utdAuthorHairston, Marc R.
dc.contributor.utdAuthorColey, William R.
dc.contributor.ORCID0000-0003-4524-4837 (Hairston, MR)

Files in this item


This item appears in the following Collection(s)

Show simple item record

CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
Except where otherwise noted, this item's license is described as CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)