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Cluster and DMSP ob...
Cluster and DMSP observations of SAID electric fields
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Puhl-Quinn, P. A. (author)
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Matsui, H. (author)
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Mishin, E. (author)
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Mouikis, C. (author)
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Kistler, L. (author)
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- Khotyaintsev, Yuri (author)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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Decreau, P. M. E. (author)
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Lucek, E. (author)
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(creator_code:org_t)
- 2007
- 2007
- English.
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In: Journal of Geophysical Research. - 0148-0227 .- 2156-2202. ; 112:A5, s. A05219-
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- [1] We report on magnetically conjugate Cluster and the Defense Meteorological Satellite Program (DMSP) satellite observations of subauroral ion drifts (SAID) during moderate geomagnetic activity levels on 8 April 2004. To our knowledge, the field-aligned separation of DMSP and Cluster (approximate to 28,000 km) is the largest separation ever analyzed with respect to the SAID phenomenon. Nonetheless, we show coherent, subauroral magnetosphere-ionosphere (MI) coupling along an entire field line in the post-dusk sector. The four Cluster satellites crossed SAID electric field channels with meridional magnitude E-M of 25 mV/m in situ and latitudinal extent Delta Lambda approximate to 0.5 degrees in the southern and northern hemispheres near 07:00 and 07:30 UT, respectively. Cluster was near perigee (R approximate to 4 R-E) and within 5 degrees (15 degrees) of the magnetic equator for the southern ( northern) crossing. The SAID were located near the plasmapause-within the ring current-plasmasphere overlap region. Downward field-aligned current signatures were observed across both SAID crossings. The most magnetically and temporally conjugate SAID field from DMSP F16A at 07:12 UT was practically identical in latitudinal size to that mapped from Cluster. Since the DMSP ion drift meter saturated at 3000 m/s (or similar to 114 mV/m) and the electrostatically mapped value for E-M from Cluster exceeded 300 mV/m, a magnitude comparison of E-M was not possible. Although the conjugate measurements show similar large-scale SAID features, the differences in substructure highlight the physical and chemical diversity of the conjugate regions.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Physics
- Fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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