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Drifting field-aligned density structures in the night-side polar cap
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SYSNO ASEP 0024213 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Drifting field-aligned density structures in the night-side polar cap Title Driftující hustotní struktury v polární oblasti na noční straně Author(s) Santolík, Ondřej (UFA-U) RID, ORCID
Persoon, A. M. (US)
Gurnett, D. A. (US)
Décréau, P. M. E. (FR)
Pickett, J. S. (US)
Maršálek, O. (US)
Maksimovic, M. (FR)
Cornilleau-Wehrlin, N. (FR)Source Title Geophysical Research Letters. - : Wiley - ISSN 0094-8276
Roč. 32, - (2005), L06106-1Number of pages 4 s. Language eng - English Country US - United States Keywords Magnetospheric Physics ; Plasma convection ; Plasma waves and instabilities ; Polar cap phenomena ; Magnetospheric configuration and dynamics Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GA202/03/0832 GA ČR - Czech Science Foundation (CSF) ME 650 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) 1P05ME811 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) Annotation Spatio-temporal properties of density irregularities in the night-side polar cap are inferred from multi-point observations of auroral hiss at a radial distance of 5 Earth radii. In this case study, we use high resolution data of the wave instruments onboard the four Cluster spacecraft to estimate the local plasma density, obtaining values close to 1 cm−3 with density depletions decreasing down to 0.15 cm−3. Combined analysis in different points in space conclusively shows for the first time that these density structures are field-aligned and that they predominantly drift in the anti-sunward direction at speeds of a few km/s. This corresponds to a dawn-to-dusk convection electric field of approximately 1 mV/m. The transverse dimension of the observed density depletions, mapped down to the ionospheric heights, is of the order of a few tens of km. Their lifetime is probably longer than tens of seconds. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2006
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