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| Titel |
Time-series analysis of temperature profiles from VIRTIS Venus Express data |
| VerfasserIn |
D. Grassi, A. Migliorini, R. Politi, L. Montabone, G. Piccioni, P. Drossart |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064325
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| Zusammenfassung |
| Nighttime infrared observations of the VIRTIS instrument on board Venus Express have
already demonstrated their potential in the study of air temperature fields of the Venusian
mesosphere.
The entire available dataset acquired by the VIRTIS-M IR channel was processed at moderate
spatial resolution (i.e. averaging pixels in 8x8 boxes) to derive an unprecedented dataset of
air temperature profiles in the pressure range 100-0.1 mbar, covering mostly the latitudes
south of 45S.
We presented in Grassi et al. (2010, doi:10.1029/2009JE003553) an analysis of the mean
properties of temperature profiles, once binned in the latitude/local time/pressure space. Here
we discuss the preliminary findings of time-series analysis of data from individual bins.
Despite the sparsity of most series, Lomb-Scargle periodogram can be effectively applied in
the regions south of 70S, where better coverage is made possible by specific properties of
Venus Express orbit. Here the algorithm is able to extract a clear signature related to a period
of about 115-120 Earth days, i.e. one Venus solar day, particularly strong at the level around
10 mbar.
Further analysis of average temperature fields in the latitude - longitude space demonstrated,
for different local times during night, that air temperatures east of Lada Terra (most
specifically in a region centered around 130°E and about 60° wide) are about 10K warmer
than in other longitudes at 75S. |
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