Study of the Latitudinal Coherence of Neutral Wind and Plasma Irregularity Drift Coupling in the Nighttime F Region Ionosphere

Details Study of the Latitudinal Coherence of Neutral Wind and Plasma Irregularity Drift Coupling in the Nighttime F Region Ionosphere Study of the Latitudinal Coherence of Neutral Wind and Plasma Irregularity Drift Coupling in the Nighttime F Region Ionosphere

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa22a0710i&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA22A-0710

Physics

2403 Active Experiments, 2415 Equatorial Ionosphere, 2427 Ionosphere/Atmosphere Interactions (0335), 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities

Scientific paper

Measurements of low-latitude thermospheric neutral winds made with a Fabry-Perot interferometer (FPI) at Carmen Alto, Chile and irregularity drifts obtained from spaced-receiver scintillation monitors at Antofagasta, Chile, during July-October 1997, are compared to determine the extent of plasma-neutral coupling. Similar studies are performed at near-magnetic equatorial sites using FPI neutral wind data from Arequipa, Peru and irregularity drift data from Ancon, Peru. These two data sets from sites separated by approximately 7o in latitude are compared on a daily as well as a monthly-averaged basis to investigate the latitudinal coherence of plasma-neutral coupling. Both sites exhibit the presence of good plasma-neutral coupling, especially after 2100~LT. This suggests that the neutral wind is the main driver of the nighttime F region ionosphere under observation. Moreover, the local wind effects can influence the field-line integrated drifts over a latitudinal extent of at least 7o, in this longitude sector, for the months studied. In general, the degree of coupling is seen to improve from the winter solstice (July) to equinox (October) months. This could in part be due to the fact that irregularity drifts can be estimated more accurately if scintillations are stronger. Averaged drifts are seen to be higher than winds before 2100~LT during October at the Chilean as well as the Peruvian sites. In Peru, the best correlation is seen between winds measured to the east and drifts measured to the west. In Chile, drifts measured to the west correlate well with the winds measured to the west and to the east.

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