equinoctial asymmetry in solar activity variations of nmf2 and tec
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2012
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Abstract
The ionosonde NmF2 data (covering several solar
cycles) and the JPL TEC maps (from 1998 through 2009) were collected to
investigate the equinoctial asymmetries in ionospheric electron density and
its variation with solar activity. With solar activity increasing, the
equinoctial asymmetry of noontime NmF2 increases at middle latitudes
but decreases or changes little at low latitudes, while the equinoctial
asymmetry of TEC increases at all latitudes. The latitudinal feature of the
equinoctial asymmetry at high solar activity is different from that at low
solar activity. The increases of NmF2 and TEC with the solar proxy
P = (F10.7+F10.7A)/2 also show equinoctial asymmetries that depend on
latitudes. The increase rate of NmF2 with P at March equinox (ME) is
higher than that at September equinox (SE) at middle latitudes, but the
latter is higher than the former at the EIA crest latitudes, and the
difference between them is small at the EIA trough latitudes. The phenomenon
of higher increase rate at SE than at ME does not appear in TEC. The increase
rate of noontime TEC with P at ME is higher than that at SE at all latitudes,
and the difference between them peaks at both sides of dip equator. It is
mentionable that the equinoctial asymmetries of NmF2 and TEC increase
rates present some longitudinal dependence at low latitude. The influences
of equinoctial differences in the thermosphere and ionospheric dynamics
processes on the equinoctial asymmetry of the electron density were briefly
discussed.
| Reference Key |
chen2012annalesequinoctial
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|---|---|
| Authors | ;Y. Chen;Y. Chen;L. Liu;W. Wan;Z. Ren |
| Journal | journal of food measurement and characterization |
| Year | 2012 |
| DOI |
10.5194/angeo-30-613-2012
|
| URL | |
| Keywords |
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