منابع مشابه
EISCAT observations of plasma patches at sub-auroral cusp latitudes
A sequence of 3 patches of high-density (1012 m−3) cold plasma on a horizontal scale-size of 300– 700 km was observed near magnetic noon by the EISCAT VHF radar above Svalbard on 17 December 2001. The patches followed a trajectory towards the cusp inflow region. The combination of radar and all-sky observations demonstrates that the patches must have been segmented equatorward of the cusp/cleft...
متن کاملMidday sub-auroral patches (MSPs) associated with interplanetary shocks
[1] We report a new category of dayside auroral transients using auroral image data from the Polar spacecraft Ultraviolet Imager. The transients are characterized by a sudden brightening of the auroral patch in the midday subauroral zone, and thus are named midday sub-auroral patches (MSPs). MSPs were found to occur concurrently with storm sudden commencements in response to the compression of ...
متن کاملLuminosity variations in several parallel auroral arcs before auroral breakup
Variation of the luminosity in two parallel auroral arcs before auroral breakup has been studied by using digitised TV-data with high temporal and spatial resolution. The intervals when a new arc appears near already existing one were chosen for analysis. It is shown, for all cases, that the appearance of a new arc is accompanied by fading or disappearance of another arc. We have named these ev...
متن کاملEstimation of Baseline Drifts in fMRI
This work provides a new method to estimate and remove baseline drifts in the fMRI signal. The baseline drift in each time series is described as a superposition of physical and physiological phenomena that occur at different scales. A fast algorithm, based on a wavelet representation of the data yields detrended time-series. Experiments with fMRI data demonstrate that our detrending technique ...
متن کاملOn Divergence-free Drifts
We investigate the validity and failure of Liouville theorems and Harnack inequalities for parabolic and elliptic operators with low regularity coefficients. We are particularly interested in operators of the form ∂t−∆+ b ·∇ resp. −∆+ b ·∇ with a divergence-free drift b. We prove the Liouville theorem and Harnack inequality when b ∈ L∞(BMO) resp. b ∈ BMO−1 and provide a counterexample demonstra...
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ژورنال
عنوان ژورنال: Journal of geomagnetism and geoelectricity
سال: 1987
ISSN: 0022-1392
DOI: 10.5636/jgg.39.609