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| Titel |
Validation of the inferred ionospheric currents during a Sudden Impulse with GNSS TEC data over Italy. |
| VerfasserIn |
Mirko Piersanti, Claudio Cesaroni, Luca Spogli, Umberto Villante, Giorgiana De Franceschi, Elvira Musicò, Antonio Avallone |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250122421
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| Publikation (Nr.) |
 EGU/EGU2016-1451.pdf |
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| Zusammenfassung |
| The definite identification of the characteristics of the geomagnetic response to Solar Wind
(SW) pressure changes represents an interesting element of the magnetospheric dynamics
that is also important in the Space Weather context. In the present analysis, we
discriminate between magnetospheric (DL) and ionospheric (DP) contributions in the
ground response comparing SEGMA array (South European Geomagnetic Array) and
geostationary observations with the predictions of the Tsyganenko model for the
different magnetospheric current systems (from the magnetopause, ring current, tail
current, etc.) for different case events. To obtain the Ionospheric contribution we
subtracted the field aligned currents (FAC) MFACE model (Model of FACs through
Empirical Orthogonal Function analysis, He et al., [2012]) from the residual DP field at
each ground station. Meaningful changes in the ionospheric currents reflect into
meaningful variation of the total electron content in the ionosphere. Thus, to validate
our approach in determining the ionospheric currents, we analyse calibrated TEC
and TEC spatial gradients data over the Italian sites of the SEGMA array derived
with a network of GNSS receivers, termed RING (Rete Integrata Nazionale GPS).
RING is a dense network of about 180 stations covering the Italian territory, by
means of which it is possible to obtain maps of TEC derived products with very fine
spatial resolution (0.1˚ x0.1˚ , lat x long). The aim of this validation is to catch
the correspondences between ionospheric current variations and the morphology
and dynamics of the TEC in the mid latitude ionosphere on selected case events. |
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