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| Titel |
Ionosphere and Thermosphere above EISCAT-ESR during IPY |
| VerfasserIn |
Pierre-Louis Blelly, Denis Alcaydé, Antony P. van Eyken |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036933
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| Zusammenfassung |
| In a previous study we showed that, with the use of 13-moment, parallel, two-ion (atomic and
molecular) energy equations to fit the full Incoherent Scatter (IS) profiles along the magnetic
field, it was possible to overcome two major difficulties for a proper analysis of the ion
energy budget in the F1- and F2-regions, namely getting accurate estimates of the ion
composition in the F1-region, and then being able to separate the relative contributions from
the neutral atmosphere and from frictional heating. It was shown that this "full profile"
method is sufficiently robust for routine use, even for periods with moderately high
convection electric fields. In the present study, the method is applied to the three-year IS
dataset recorded at the EISCAT Svalbard Radar (ESR) during the International Polar Year
(IPY ) period (March. 2007 - Sept. 2009), and the results are used to study long-term
variations in the ionosphere and neutral atmosphere. For that purpose, we choose to
use a similar approach to that used in the MSIS models for determining the time
variability of the measured/inferred parameters and built what we call ESR-IPY
models of ionospheric and atmospheric parameters. After discussing a case-day
example for which the quality of the global models fits is shown, the long term
behavior (year-to-year, seasonal, solar flux and geomagnetic activity) is shown
and contrasted, when available, with existing standard models such as MSIS and
IRI.
Key words. Polar cap ionosphere, Ionosphere/atmosphere interactions, Modelling and
forecasting |
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