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Titolo:
Optical and particle signatures of magnetospheric boundary layers near magnetic noon: Satellite and ground-based observations
Autore:
Oksavik, K; Soraas, F; Moen, J; Burke, WJ;
Indirizzi:
Univ Bergen, Dept Phys, N-5007 Bergen, Norway Univ Bergen Bergen Norway N-5007 ergen, Dept Phys, N-5007 Bergen, Norway Univ Courses Svalbard, Longyearbyen, Norway Univ Courses Svalbard Longyearbyen Norway valbard, Longyearbyen, Norway USAF, Res Lab, Hanscom AFB, MA USA USAF Hanscom AFB MA USAUSAF, Res Lab, Hanscom AFB, MA USA
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A12, volume: 105, anno: 2000,
pagine: 27555 - 27568
SICI:
0148-0227(200012)105:A12<27555:OAPSOM>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOVING AURORAL FORMS; MAGNETOPAUSE RECONNECTION; IONOSPHERIC CONVECTION; WIND SPACECRAFT; CUSP AURORA; FIELD; PLASMA; PRECIPITATION; MAGNETOSHEATH; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Oksavik, K Univ Bergen, Dept Phys, Allegaten 55, N-5007 Bergen, Norway Univ Bergen Allegaten 55 Bergen Norway N-5007 7 Bergen, Norway
Citazione:
K. Oksavik et al., "Optical and particle signatures of magnetospheric boundary layers near magnetic noon: Satellite and ground-based observations", J GEO R-S P, 105(A12), 2000, pp. 27555-27568

Abstract

In this paper we present a set of satellite and ground-based observations suggesting that energetic magnetospheric electrons cannot be used as an unambiguous discriminator between open and closed field lines on the dayside. Using two data sets from the Defense Meteorological Satellite Program (DMSP) F13 and NOAA 12 satellites flying through dayside Type 1 cusp aurora (both close in time and space), we reach two apparently incompatible conclusions. Cusp/mantle precipitation, stepped cusp signatures, and antisunward convection in the DMSP F13 data set strongly suggest open magnetic field lines. On the other hand, NOAA 12 observed a mixture of magnetosheath and isotropic energetic particles. Trapped energetic electrons are traditionally regarded as being on closed flux. However, in addition to earlier proposed trapping on open field lines, we suggest that transmission lines connecting merging sites near the cusp in the Southern Hemisphere with the northern auroral ionosphere can be several tens of RE long. Alfven wave transit times of several minutes may make it impossible to determine from satellite measurements in the ionosphere whether magnetic field lines threading low-latitude boundary layer (LLBL) plasmas are open or closed. New research tools will beneeded to unify understanding of complementary particle measurements from the DMSP and NOAA satellites.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 13:16:27