Three-dimensional equatorial spread F modeling
نویسندگان
چکیده
منابع مشابه
A Review of Equatorial Spread F
Equatorial spread F is a spectacular phenomenon in which the equatorial region ionosphere is reshaped after sunset. The plasma instabilities responsible for equatorial spread F are fascinating since they occur on time scales ranging from seconds to hours and length scales from centimeters to tens of kilometers. The plasma irregularities that occur in the F region also influence the performance ...
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متن کاملPossible ionospheric preconditioning by shear flow leading to equatorial spread F
Vertical shear in the zonal plasma drift speed is apparent in incoherent and coherent scatter radar observations of the bottomside F region ionosphere made at Jicamarca from about 1600–2200 LT. The relative importance of the factors controlling the shear, which include competition between the E and F region dynamos as well as vertical currents driven in the E and F regions at the dip equator, i...
متن کاملCharacterization of VHF radar observations associated with equatorial Spread F by narrow-band optical measurements
The VHF radars have been extensively used to investigate the structures and dynamics of equatorial Spread F (ESF) irregularities. However, unambiguous identification of the nature of the structures in terms of plasma depletion or enhancement requires another technique, as the return echo measured by VHF radar is proportional to the square of the electron density fluctuations. In order to addres...
متن کاملEffect of equatorial ionization anomaly on the occurrence of spread-F
The unique geometry of the geomagnetic field lines over the equatorial ionosphere coupled with the E– W electric field causes the equatorial ionization anomaly (EIA) and equatorial spread-F (ESF). Ionosonde data obtained at a chain of four stations covering equator to anomaly crest region (0.3 to 33 °N dip) in the Indian sector are used to study the role of EIA and the associated processes on t...
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ژورنال
عنوان ژورنال: Geophysical Research Letters
سال: 2008
ISSN: 0094-8276
DOI: 10.1029/2008gl033509