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Browsing College of Sciences and Mathematics by Author "Valek, P"

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Comparison of TWINS and THEMIS observations of proton pitch angle distributions in the ring current during the 29 May 2010 geomagnetic storm 

Grimes, E; Perez, J; Goldstein, J; McComas, D; Valek, P; Turner, D; 0000-0002-2425-7818; 0000-0002-2318-8750 (2022-12-02)
The first comparison between energy-dependent ion pitch angle distributions in the ring current deconvolved from Two Wide-angle Imagining Neutral-atom Spectrometers (TWINS) energetic neutral atom (ENA) images and measured ...

The Comprehensive Inner Magnetosphere-Ionosphere Model 

Fok, M; Buzulukova, N; Chen, S; Glocer, A; Nagai, T; Valek, P; Perez, J; 0000-0001-9500-866X; 0000-0001-9843-9094; 0000-0002-2318-8750 (2023-01-31)
Simulation studies of the Earth's radiation belts and ring current are very useful in understanding the acceleration, transport, and loss of energetic particles. Recently, the Comprehensive Ring Current Model (CRCM) and ...

Global images of trapped ring current ions during main phase of 17 March 2015 geomagnetic storm as observed by TWINS 

Perez, J; Goldstein, J; McComas, D; Valek, P; Fok, M; Hwang, Kyoung-Joo; 0000-0001-9500-866X; 0000-0002-2318-8750 (2023-01-26)
A unique view of the trapped particles in the inner magnetosphere provided by energetic neutral atom (ENA) imaging is used to observe the dynamics of the spatial structure and the pitch angle anisotropy on a global scale ...

Global observations of ring current dynamics during corotating interaction region-driven geomagnetic storms in 2008 

Grimes, E; Perez, J; Goldstein, J; McComas, D; Valek, P; 0000-0001-6160-1158; 0000-0002-2318-8750 (2022-10-27)
We examine the evolution of the ring current during the main and early recovery phases of three geomagnetic storms driven by corotating interaction regions. The equatorial energy density profiles of 5-30 keV ions are ...

Outflow from the ionosphere in the vicinity of the cusp 

Valek, P; Perez, J; Jahn, J.-M; Pollock, C; Wüest, M; Friedel, R; Moore, T; Peterson, W; 0000-0002-2318-8750; 0000-0002-1513-6096 (2023-01-26)
[1] Low-energy ion outflows from the ionosphere are known to be an important source of plasma for the magnetosphere. The objective of this study is to describe the spatial relationships between low-energy ionospheric ...

Statistical correlation of low-altitude ENA emissions with geomagnetic activity from IMAGE/MENA observations 

Mackler, D; Jahn, J; Perez, J; Pollock, C; Valek, P; 0000-0002-2318-8750 (2022-12-02)
Plasma sheet particles transported Earthward during times of active magnetospheric convection can interact with exospheric/thermospheric neutrals through charge exchange. The resulting Energetic Neutral Atoms (ENAs) are ...

TWINS stereoscopic imaging of multiple peaks in the ring current 

Perez, J; Goldstein, J; McComas, D; Valek, P; Buzulukova, N; Fok, M; Singer, H; 0000-0001-9500-866X; 0000-0002-2318-8750 (2023-01-25)
Global, ion equatorial flux distributions and energy spectra are presented from stereoscopic Two Wide-Angle Imaging Neutral-Atom Spectrometers (TWINS) 1 and TWINS 2 energetic neutral atom (ENA) images for two time periods, ...