Advances in magnetospheric physics: Energetic particles

West, H. I.

doi:10.1029/rg013i003p00943

Cited by 6 publications

(1 citation statement)

References 338 publications

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“…At least a portion of the LPL consists of closed field lines on which low-energy (E •< I MeV) solar electrons and protons can be temporarily trapped. The solar protons, in particular, are able to reach deep into the closed field line region [Paulikas, 1974;Scholer, 1975;West, 1975].…”

Section: Moreovermentioning

confidence: 99%

Incoherent scatter radar observations during August 4–7, 1972

Wedde¹,

Doupnik²,

Banks³

et al. 1977

Radio Science

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The incoherent scatter radar installation at Chatanika, Alaska (Λ = 65°) has been used to investigate ionospheric conductivities, electric fields, and electron densities during the extraordinarily large magnetospheric disturbances of August 4–7, 1972. It is found that following two sudden commencements which occurred on August 4 while Chatanika was in the afternoon sector, the polar cusp moved equatorwards to the latitude of Chatanika. The usual midnight sector discontinuity of the ionospheric electric field was probably encountered around 2100–2130 MLT on all four days studied, although on August 4, the discontinuity may have been encountered as late as 0100 MLT and on August 6, as early as 1900 MLT. Heating of the neutral atmosphere by precipitating energetic particles and Joule dissipation varied considerably throughout the period of observation, at times reaching 200 ergs cm−2S−1. With regard to the electric field, unusually large values were not seen during the storm period. In the local evening sector, for example, the northward component of the field reached only 60 mV m−1. During the times near local noon, the electric field reached some 50 mV m−1 in association with an encounter of the polar cusp. Examination of the height‐integrated Pedersen and Hall conductivities shows the presence of a periodic variation with conductivity maxima being spaced roughly one hour apart throughout most of the period of observation. To a large extent it appears that at Chatanika the exceptional nature of this storm period was associated solely with a greatly enlarged and thickened auroral oval since neither the conductivities nor the electric field strength were unusually large.

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Section: Moreovermentioning

confidence: 99%