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| Titel |
Dusk-to-nighttime enhancement of mid-latitude NmF2 in local summer: inter-hemispheric asymmetry and solar activity dependence |
| VerfasserIn |
Y. Chen, L. Liu, H. Le, W. Wan, H. Zhang |
| 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. 6 ; Nr. 33, no. 6 (2015-06-10), S.711-718 |
| Datensatznummer |
250121209
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| Publikation (Nr.) |
 copernicus.org/angeo-33-711-2015.pdf |
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| Zusammenfassung |
| In this paper ionosonde observations in the East
Asia–Australia sector were collected to investigate dusk-to-nighttime
enhancement of mid-latitude summer NmF2 (maximum electron density
of the F2 layer) within the framework of NmF2 diurnal
variation. NmF2 were normalized to two solar activity levels to
investigate the dependence of the dusk-to-nighttime enhancement on solar
activity. The dusk-to-nighttime enhancement of NmF2 is more evident
at Northern Hemisphere stations than at Southern Hemisphere stations, with a
remarkable latitudinal dependence. The dusk-to-nighttime enhancement shows
both increasing and declining trends with solar activity increasing, which
is somewhat different from previous conclusions. The difference in the
dusk-to-nighttime enhancement between Southern Hemisphere and Northern Hemisphere
stations is possibly related to the offset of the geomagnetic axis from the
geographic axis. hmF2 (peak height of the F2 layer) diurnal
variations show that daytime hmF2 begins to increase much earlier at
low solar activity level than at high solar activity level at northern Akita
and Wakkanai stations where the dusk-to-nighttime enhancement is more
prominent at low solar activity level than at high solar activity level.
That implies neutral wind phase is possibly also important for nighttime
enhancement. |
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