Premium
Incidence of Alfvenic SC Pulse Onto the Conjugate Ionospheres
Author(s) -
Pilipenko Vyacheslav A.,
Fedorov Evgeniy N.,
Xu Zhonghua,
Hartinger Michael D.,
Engebretson Mark J.,
Edwards Thom R.
Publication year - 2020
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1029/2019ja027397
Subject(s) - conjugate , physics , incidence (geometry) , pulse (music) , optics , mathematics , mathematical analysis , detector
A circuit analogy for magnetosphere‐ionosphere current systems has two extremes: the voltage generator (when the ground magnetic response is proportional to the ionospheric conductance) and the current generator (when the ground magnetic response practically does not depend on the ionospheric conductance). Nonsteady field‐aligned currents interact with the ionosphere in a different way depending on the ratio between the driver time scale τ and the Alfven field line eigenperiod T A . Sudden Commencement (SC) impulses at high latitudes correspond to the situation when τ ≪ T A . This case of Alfven pulses propagating independently away from the equatorial plane is analytically examined with the magnetospheric plasma box model with thin asymmetric conjugate ionospheres. At high latitudes the amplitude ratio in conjugate ionospheres in general does not correspond directly to either the current or voltage regimes. Theoretical predictions are supported by examples of typical SC event observations at conjugate magnetometer sites in Greenland and Antarctica during summer and winter periods.