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| Titel |
Aspect sensitivity of polar mesosphere summer echoes based on ESRAD MST radar measurements in Kiruna, Sweden in 1997–2010 |
| VerfasserIn |
M. Smirnova, E. Belova, S. Kirkwood  |
| 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 ; 30, no. 3 ; Nr. 30, no. 3 (2012-03-01), S.457-465 |
| Datensatznummer |
250017193
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| Publikation (Nr.) |
 copernicus.org/angeo-30-457-2012.pdf |
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| Zusammenfassung |
| Aspect sensitivities of polar mesosphere summer echoes (PMSE) measured with
the ESRAD 50 MHz radar in 1997–2010 are studied using the full correlation
analysis technique. Half of PMSE detected each year are found to be highly
aspect sensitive. Yearly median values of the aspect sensitivity parameter
θs, characterising the half-width of the scatterers' polar
diagram, are 2.9–3.7° depending on the year. The other half of the PMSE
have θs values larger than 9–11° and cannot be evaluated
using the ESRAD vertical beam only. PMSE aspect sensitivity reveals an
altitude dependence, namely, the scatter becomes more isotropic with
increasing height. This result is consistent with that reported in other
studies. No dependence of PMSE aspect sensitivity on backscattered power for
any year was identified. In the paper the limitations of the in-beam and
off-vertical beam methods for estimation of PMSE aspect sensitivity are
discussed. We conclude that both methods should be combined in order to get
complete information about PMSE aspect sensitivity and to estimate correctly
PMSE absolute strength. |
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