Simultaneous Satellite and Ground Based Observations of Polar Cap Phenomena
نویسندگان
چکیده
منابع مشابه
Ground-based observations of the auroral zone and polar cap ionospheric responses to dayside transient reconnection
Observations from the EISCAT VHF incoherent scatter radar system in northern Norway, during a run of the common programme CP-4, reveal a series of polewardpropagating F-region electron density enhancements in the pre-noon sector on 23 November 1999. These plasma density features, which are observed under conditions of a strongly southward interplanetary magnetic field, exhibit a recurrence rate...
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Over the past few years, different theories (piezoelectric, positive holes, friction-vaporization, exo-electron emission, tribo- or fracture electrification) have been presented for the interpretation of earthquake lights. Although these theories can interpret earthquake luminous, each suffer from particular problems. There are also ambiguities and questions about the location of the light, the...
متن کاملEvidence for thermospheric gravity waves in the southern polar cap from ground-based vertical velocity and photometric observations
Zenith-directed Fabry-Perot Spectrometer (FPS) and 3-Field Photometer (3FP) observations of the λ630 nm emission (∼240 km altitude) were obtained at Davis station, Antarctica, during the austral winter of 1999. Eleven nights of suitable data were searched for significant periodicities common to vertical winds from the FPS and photometric variations from the 3FP. Three wave-like events were foun...
متن کاملPolar cap potential saturation: Observations, theory, and modeling
The polar cap potential ðFPCÞ has long been considered an indicator for the amount of energy flowing into and through the magnetosphere–ionosphere (M–I) system. Studies have shown that FPC reaches an upper limit, or saturates, during geomagnetic storms where the solar wind electric field becomes increasingly large. Numerous observational, theoretical, and modeling studies of FPC have seemingly ...
متن کاملPolar cap index comparisons with AMIE cross polar cap potential, electric field, and polar cap area
[1] The polar cap index (PCI) has been shown to be quite useful as an index of the electrodynamic processes within the high-latitude ionosphere. Here we use between 150 and 180 magnetometers to model the high-latitude electrodynamics with the assimilative mapping of ionospheric electrodynamics (AMIE) technique for all of 1997–2001. We compare AMIE calculations of the cross polar cap potential (...
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ژورنال
عنوان ژورنال: Journal of geomagnetism and geoelectricity
سال: 1996
ISSN: 0022-1392
DOI: 10.5636/jgg.48.935