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| Titel |
Observations and modeling of UHF-band scintillation occurrence probability over the low-latitude region of China during the maximum activity of solar cycle 24 |
| VerfasserIn |
H. Zhang, Y. Liu, J. Wu, T. Xu, D. Sheng |
| 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 ; 33, no. 1 ; Nr. 33, no. 1 (2015-01-16), S.93-100 |
| Datensatznummer |
250121152
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| Publikation (Nr.) |
 copernicus.org/angeo-33-93-2015.pdf |
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| Zusammenfassung |
| The climatological characteristics of UHF-band scintillations over the low-latitude region of China were investigated by analyzing the observations
recorded at three stations of our regional network of satellite-beacon-based
scintillation monitoring in 2013. The three stations are Hainan (geographic
20.0° N, 110.3° E; geomagnetic 10.1° N,
177.4° W, dip 28.2°), Guangzhou (geographic
23.0° N, 113.0° E; geomagnetic 13.1° N,
174.8° W, dip 33.9°) and Kunming (geographic
25.6° N, 103.7° E; geomagnetic 15.7° N,
176.4° E, dip 39.0°), located at low latitudes of China.
The variations of UHF-band scintillation occurrence with latitude, time and
season are presented in detail to understand the morphology and climatology
of ionospheric scintillations over the low-latitude region of China. An
equinoctial asymmetry in the occurrences of scintillation and an obvious
difference of the onset time of scintillations between Hainan and Kunming is
noted in this data set. Subsequently, the ionosonde data are utilized to study
the possible causes of the asymmetry between two equinoxes. The observations
suggest that the mean critical frequency (foF2) at 20:00 LT
(12:00 UT) in the autumnal equinoctial months (September and October) and the
vernal equinoctial months (March and April) has a similar asymmetry. The
ratio of the mean foF2 between two equinoxes is proportional to the
ratio between the maximum scintillation occurrence in the autumnal equinox and
in the vernal equinox. Therefore, this ratio can act as a proxy for the equinoctial
asymmetry in the occurrences of scintillation over the low-latitude region of China, and can be used to model the equinoctial asymmetry in our empirical
climatological model of scintillation occurrence probability (CMSOP). The
CMSOP can provide the predictions of the occurrences of scintillation over
the low-latitude region of China and was validated in this study. |
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