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| Titel |
Topside measurements at Jicamarca during solar minimum |
| VerfasserIn |
D. L. Hysell, J. L. Chau, J. D. Huba |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 1 ; Nr. 27, no. 1 (2009-01-23), S.427-439 |
| Datensatznummer |
250016383
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| Publikation (Nr.) |
 copernicus.org/angeo-27-427-2009.pdf |
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| Zusammenfassung |
| Long-pulse topside radar data acquired at Jicamarca and processed
using full-profile analysis are compared to data processed using more
conventional, range-gated approaches and with analytic and
computational models. The salient features of the topside observations
include a dramatic increase in the Te/Ti temperature ratio above
the F peak at dawn and a local minimum in the topside plasma
temperature in the afternoon. The hydrogen ion fraction was found to
exhibit hyperbolic tangent-shaped profiles that become shallow
(gradually changing) above the O+-H+ transition height during
the day. The profile shapes are generally consistent with diffusive
equilibrium, although shallowing to the point of changes in inflection
can only be accounted for by taking the effects of E×B
drifts and meridional winds into account. The SAMI2 model
demonstrates this as well as the substantial effect that drifts and
winds can have on topside temperatures. Significant quiet-time
variability in the topside composition and temperatures may be due to
variability in the mechanical forcing. Correlations between topside
measurements and magnetometer data at Jicamarca support this
hypothesis. |
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