Signatures of wedgelets over Fennoscandia during the St Patrick s Day Storm 2015

Schillings, AudreyUmeå universitet,Institutionen för fysik,School of Physics and Astronomy, University of Leicester, United Kingdom (författare)

During the long main phase of the St Patrick's Day storm on March 17, 2015, we found three separate enhancements of the westward electrojet. These enhancements are observed in the ionospheric equivalent currents computed using geomagnetic data over Fennoscandia. Using data from the IMAGE magnetometer network, we identified localised field-aligned current (FAC) systems superimposed on the pre-existing ionospheric current system. We suggest that these localised current systems are wedgelets and that they can potentially contribute to a larger-scale structure of a substorm current wedge (SCW). Each wedgelet is associated with a negative BX spike. Each spike is recorded at a higher latitude than the former one and all three are very localised over Fennoscandia. The first spike occurred at 17:34 UT and was observed at Lycksele, R rvik and Nurmij rvi, the second spike was recorded at 17:41 UT and located at Lycksele and R rvik, whereas the last spike occurred at 17:47 UT and was observed at Kevo and Abisko. Simultaneous optical auroral data and electron injections at the geosynchronous orbit indicate that one or more substorms took place in the polar ionosphere at the time of the wedgelets. This study demonstrates the occurrence of small and short-lived structures such as wedgelets at different locations over a short time scale, 15 min in this case.

Palin, LaurianneThales Alenia Space, Toulouse, France (författare)
Bower, Gemma E.School of Physics and Astronomy, University of Leicester, United Kingdom (författare)
Opgenoorth, Hermann J.Umeå universitet,Institutionen för fysik,School of Physics and Astronomy, University of Leicester, United Kingdom(Swepub:umu)heop0005 (författare)
Milan, Steve E.School of Physics and Astronomy, University of Leicester, United Kingdom (författare)
Kauristie, KirstiFinnish Meteorological Institute, Dynamicum Erik Palménin aukio 1, Helsinki, Finland (författare)
Juusola, LiisaFinnish Meteorological Institute, Dynamicum Erik Palménin aukio 1, Helsinki, Finland (författare)
Reeves, Geoff D.Space Science and Applications Group, Los Alamos National Laboratory, NM, Los Alamos, United States (författare)
Henderson, Mike G.Space Science and Applications Group, Los Alamos National Laboratory, NM, Los Alamos, United States (författare)
Paxton, Larry J.Johns Hopkins University Applied Physics Laboratory, Laurel, United States (författare)
Lester, MarkSchool of Physics and Astronomy, University of Leicester, United Kingdom (författare)
Hamrin, Maria,1972-Umeå universitet,Institutionen för fysik(Swepub:umu)maha0006 (författare)
Van De Kamp, MaxFinnish Meteorological Institute, Dynamicum Erik Palménin aukio 1, Helsinki, Finland (författare)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

Av författaren/redakt...: Schillings, Audr ...; Palin, Laurianne; Bower, Gemma E.; Opgenoorth, Herm ...; Milan, Steve E.; Kauristie, Kirst ...; visa fler...; Juusola, Liisa; Reeves, Geoff D.; Henderson, Mike ...; Paxton, Larry J.; Lester, Mark; Hamrin, Maria, 1 ...; Van De Kamp, Max; visa färre...

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