Results 221 to 230 of about 926,286 (251)

Polar Cap Patch Transportation Beyond the Classic Scenario [PDF]

Journal of Geophysical Research: Space Physics, 2016
We report the continuous monitoring of a polar cap patch, encompassing its creation, and a subsequent evolution that differs from the classic behavior.
Mark Lester, Evan G Thomas, Beichen Zhang   +2 more
exaly   +10 more sources

Polar Cap Hot Patches: Enhanced Density Structures Different From the Classical Patches in the Ionosphere [PDF]

Geophysical Research Letters, 2017
Based on in situ and ground-based observations, a new type of “polar cap hot patch” has been identified that is different from the classical polar cap enhanced density structure (cold patches).
Zan-Yang Xing, Shun-Rong Zhang, John C. Foster   +2 more
exaly   +6 more sources

Decay of Polar Cap Patch [PDF]

Journal of Geophysical Research: Space Physics, 2011
Keisuke Hosokawa, Yuichi Ōtsuka, Kazuo Shiokawa   +2 more
exaly   +2 more sources

On the Symmetry of Ionospheric Polar Cap Patch Exits Around Magnetic Midnight [PDF]

Journal of Geophysical Research: Space Physics, 2015
In this paper we examine how polar cap patches, which have been frozen into the antisolar flow over the polar cap, are transported into the nighttime auroral oval.
Keisuke Hosokawa, Lasse Clausen, J Moen
exaly   +3 more sources

The Interconnection Between Cross‒Polar Cap Convection and the Luminosity of Polar Cap Patches [PDF]

Journal of Geophysical Research: Space Physics, 2013
The transport of patches of ionization across the polar cap is carried by the convection electric field, which imposes an E×B drift to the plasma. This drift has an upward component when the plasma is convected toward the north magnetic pole and a downward component as it moves away from the pole.
Keisuke Hosokawa, Gareth Perry, J -P St -Maurice   +2 more
exaly   +2 more sources

Edge of Polar Cap Patches [PDF]

Journal of Geophysical Research: Space Physics, 2016
AbstractOn the night of 4 December 2013, a sequence of polar cap patches was captured by an all‐sky airglow imager (ASI) in Longyearbyen, Norway (78.1°N, 15.5°E). The 630.0 nm airglow images from the ASI of 4 second exposure time, oversampled the emission of natural lifetime (with quenching) of at least ∼30 sec, introduce no observational blurring ...
Keisuke Hosokawa, Satoshi Taguchi, Yasunobu Ogawa   +2 more
exaly   +2 more sources

Interhemispheric Study of Polar Cap Patch Occurrence Based on Swarm in Situ Data

Journal of Geophysical Research: Space Physics, 2017
The Swarm satellites offer an unprecedented opportunity for improving our knowledge about polar cap patches, which are regarded as the main space weather issue in the polar caps.
Yaqi Jin, Wojciech J. Miloch, Andres Spicher   +2 more
exaly   +2 more sources

In Situ Measurement of a Newly Created Polar Cap Patch [PDF]

Journal of Geophysical Research: Space Physics, 2010
The Investigation of Cusp Irregularities 2 sounding rocket was launched 5 December 2008 at 1035 UT. We present an overview of the associated solar wind and auroral conditions, and we look in detail at the relationship between poleward moving auroral forms (PMAFs) and the creation of polar cap patches using ground‐based optical and radar data as well as
Dag A Lorentzen, Yoshifumi Saito, Magnar G Johnsen   +2 more
exaly   +2 more sources

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Effect of polar cap patches on the polar thermosphere

Journal of Geophysical Research: Space Physics, 1995
Polar cap patches are regions of enhanced ionization that appear when the interplanetary magnetic field is southward. They are created either in the dayside cusp or equatorward of the cusp in the sunlit hemisphere. Once formed, they convect in an antisunward direction across the dark polar cap at speeds of 100 m/s to about 2 km/s.
Ti‐Ze Ma, R. W. Schunk
openaire   +1 more source