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| Titel |
Climatology of nighttime medium-scale traveling ionospheric disturbances (MSTIDs) in the Central Pacific and South American sectors |
| VerfasserIn |
T. M. Duly, N. P. Chapagain, J. J. Makela |
| 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 ; 31, no. 12 ; Nr. 31, no. 12 (2013-12-20), S.2229-2237 |
| Datensatznummer |
250086166
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| Publikation (Nr.) |
 copernicus.org/angeo-31-2229-2013.pdf |
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| Zusammenfassung |
| We present occurrence rate statistics for nighttime medium-scale traveling
ionospheric disturbances (MSTIDs) in the Central Pacific and South American
sectors using data collected by 630.0 nm filtered CCD imaging systems. The
data were collected from September 2006 through December 2012. In general,
the statistics are in good agreement with the basic linear theory of MSTIDs,
with observations coinciding with low F10.7A values, representative of solar
minimum. Overall, MSTIDs are observed in approximately 68% of the usable
nights near the solstices at mid-latitudes and approximately 20% of the
usable nights for equinox periods. Observations closer to the geomagnetic
equator yielded a maximum occurrence rate of about 10–20% during the
solstices and about 0–3% during the equinoxes. The lower number of MSTID
observations near the low latitudes is attributed to limitations of MSTID
growth rate, propagation, and/or geometrical observational effects. The
relatively large number of MSTID occurrences during the solstices can be
accounted for by the neutral wind contribution to the MSTID growth rate
either at the local or magnetic conjugate point. |
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