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Browsing College of Sciences and Mathematics by Author "Perez, J"

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Comparison of CIMI Simulations and TWINS Observations on June 28 and 29, 2013 

Shekhar, Sapna; Perez, J; Davidson, K; Fok, M; 0000-0002-5619-9093; 0000-0002-2815-4998 (2022-10-27)
A moderate geomagnetic storm (Sym/H similar to-100 nT) during June 28 and 29, 2013 was studied using Comprehensive Inner Magnetosphere-Ionosphere (CIMI) simulations and results were compared with Two wide-angle Imaging ...

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 ...

Dynamics of ring current ions as obtained from IMAGE HENA and MENA ENA images 

Perez, J; Zhang, X; Brandt, P; Mitchell, D; Jahn, J; Pollock, C; 0000-0002-4644-0306; 0000-0003-1960-2119 (2022-10-27)
Ion distributions from three storms in the year 2000 have been obtained from HENA and MENA ENA images at 27-39 keV and 5-12 keV, respectively. The observed motion of the ring current is compared with calculations of expected ...

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 ...

Global-scale hybrid simulation of cusp precipitating ions associated with magnetopause reconnection under southward IMF 

Tan, B; Lin, Y; Perez, J; Wang, X (2022-09-20)
With a 3-D global-scale hybrid simulation model, we investigate the energy spectra of cusp precipitating ions and issues associated with magnetopause reconnection under a southward IMF. Both the spatial and temporal energy ...

Global-scale hybrid simulation of dayside magnetic reconnection under southward IMF: Structure and evolution of reconnection 

Tan, B; Lin, Y; Perez, J; Wang, X (2022-09-20)
Magnetopause reconnection is investigated with our 3-D self-consistent global hybrid simulation model. The magnetic configuration and evolution of Flux Transfer Events (FTEs) and the associated ion density and ion velocity ...

Investigation of storm timemagnetotail and ion injection using three-dimensional global hybrid simulation 

Lin, Y; Wang, X; Lu, S; Perez, J; Lu, Q (2022-09-29)
Dynamics of the near-Earth magnetotail associated with substorms during a period of extended southward interplanetary magnetic field is studied using a three-dimensional (3-D) global hybrid simulation model that includes ...

Kinetic Alfven Waves From Magnetotail to the Ionosphere in Global Hybrid Simulation Associated With Fast Flows 

Cheng, Lei; Lin, Yu; Perez, J; Johnson, Jay; Wang, Xueyi; 0000-0002-9562-1103; 0000-0002-5619-9093 (2022-09-29)
We have used the Auburn Global Hybrid Code in 3-D to study the generation, dynamics, and global structure of kinetic Alfven waves (KAWs) from the magnetotail to the ionosphere. Our results show that KAWs are generated in ...

LOW-ALTITUDE OBSERVATIONS AND MODELING OF QUASI-STEADY MAGNETOPAUSE RECONNECTION 

Onsager, T; Chang, Shen-Wu; Perez, J; Austin, J; Janoo, L (2022-09-29)
Data from two near-conjugate passes of DE 1 and DE 2 through the cusp/cleft region of the Earth's magnetosphere are presented and compared with model calculations of particle transport from the solar wind to spacecraft ...

Magnetotail-Inner Magnetosphere Transport Associated With Fast Flows Based on Combined Global-Hybrid and CIMI Simulation 

Lin, Y; Wang, X; Fok, M; Buzulukova, N; Perez, J; Cheng, L; Chen, L; 0000-0002-4768-189X; 0000-0002-5619-9093; 0000-0002-8127-2248 (2022-11-01)
Using the combined Auburn global hybrid simulation code in 3-D (ANGIE3D) and the Comprehensive Inner Magnetosphere-Ionosphere (CIMI) model, we investigate the self-consistent connection of fast flow injections from the ...

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 ...

Overlap of the plasmasphere and ring current: Relation to subauroral ionospheric heating 

Gurgiolo, C; Sandel, B; Perez, J; Mitchell, D; Pollock, C; Larsen, B; 0000-0003-4515-0208; 0000-0003-1960-2119 (2023-01-26)
The overlap of the ring current with the outer plasmasphere is thought to play a major role in storm-time related increases in the subauroral ambient topside electron temperature. Instabilities generated within the overlap ...

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 ...

A study of the electromagnetic proton cyclotron instability as a generation mechanism for EMIC waves in the Earth's magnetosphere using SCATHA data 

Nguyen, Son; Perez, J; Fennell, Joseph (2022-10-04)
Using 59 days of magnetic field data from SCATHA, a study of the electromagnetic proton cyclotron instability as a generation mechanism for EMIC waves in the Earth's magnetosphere has been conducted. From 1181 events found, ...

Trapped and precipitating protons in the inner magnetosphere as seen by IMAGE 

Perez, J; Zhang, X; Brandt, P; Mitchell, D; Jahn, J; Pollock, C; Mende, S; 0000-0003-1960-2119; 0000-0002-4644-0306 (2022-12-02)
[1] Images from the IMAGE satellite of precipitating protons (SU12/FUV) and trapped protons at 8.5 (MENA) and 33 keV (HENA) are compared during three periods: ( 1) 12 August 2000 from 1000 UT to 1145 UT just after the peak ...

TWINS Observations of the Dynamics of Ring Currents Ion Spectra on March 17 and October 7, 2015 

Shekhar, S; Perez, J; Ferradas, C; 0000-0002-2815-4998; 0000-0002-5619-9093; 0000-0002-6931-1793 (2022-10-27)
Direct comparisons between RBSP (Van Allen Probes or Radiation Belt Storm Probes) and TWINS (Two Wide-angle Imaging Neutral-atom Spectrometers) for the main phase of two storms, March 17 and October 7, 2015, showed agreement ...

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, ...