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

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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. W.; Perez, J. D.; Goldstein, J.; McComas, D. J.; Valek, P.; Turner, D. (2020-06-09)

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. -C.; Buzulukova, N. Y.; Chen, S. -H.; Glocer, A.; Nagai, T.; Valek, P.; Perez, J. D. (2020-06-05)

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 ...

Cross-scale observations of the 2015 St. Patrick's day storm: THEMIS, Van Allen Probes, and TWINS

Goldstein, J.; Perez, J. D.; Wygant, J. R.; 0000-0002-5619-9093 (2020-06-01)

We present cross-scale magnetospheric observations of the 17 March 2015 (St. Patrick's Day) storm, by Time History of Events and Macroscale Interactions during Substorms (THEMIS), Van Allen Probes (Radiation Belt Storm ...

Evolution of CIR storm on 22 July 2009

Perez, J. D.; Grimes, E. W.; Goldstein, J.; McComas, D. J.; Valek, P.; Billor, N. (2020-06-09)

Global images of ion intensities are deconvolved from TWINS ENA images during the main and recovery phase of a CIR storm on 22 July 2009. The global spatial ion images taken at different times, along with solar wind data, ...

Evolution of low-altitude and ring current ENA emissions from a moderate magnetospheric storm: Continuous and simultaneous TWINS observations

Valek, P.; Brandt, P. C.; Buzulukova, N.; Fok, M-C.; Goldstein, J.; McComas, D. J.; Perez, J. D.; Roelof, E.; Skoug, R. (2020-06-12)

The moderate storm of 22 July 2009 is the largest measured during the extended solar minimum between December 2006 and March 2010. We present observations of this storm made by the two wide-angle imaging neutral-atom ...

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

Perez, J. D.; Goldstein, J.; McComas, D. J.; Valek, P.; Fok, M-C; Hwang, Kyoung-Joo (2020-06-03)

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. W.; Perez, J. D.; Goldstein, J.; McComas, D. J.; Valek, P. (2020-06-12)

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. D.; Wang, X. Y.; 0000-0001-8003-9252; 0000-0001-5533-5981 (2020-06-09)

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. D.; Wang, X. Y.; 0000-0001-8003-9252; 0000-0001-5533-5981 (2020-06-12)

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 time magnetotail and ion injection using three-dimensional global hybrid simulation

Lin, Y.; Wang, X. Y.; Lu, S.; Perez, J. D.; Lu, Q.; 0000-0001-8003-9252; 0000-0001-5533-5981 (2020-06-05)

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 ...

Oxygen-hydrogen differentiated observations from TWINS: The 22 July 2009 storm

Valek, P. W.; Goldstein, J.; McComas, D. J.; Ilie, R.; Buzulukova, N.; Fok, M. -C.; Perez, J. D. (2020-06-09)

The 22 July 2009 magnetic storm is the first significant storm during the emergence of the recent prolonged solar cycle minimum. This moderate storm (minimum Dst approximately -78 nT) has received a good deal of attention ...

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

Mackler, D. A.; Jahn, J-M; Perez, J. D.; Pollock, C. J.; Valek, P. W. (2020-06-03)

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 T.; Perez, J. D.; Fennell, Joseph F. (2020-06-16)

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, ...

TWINS stereoscopic imaging of multiple peaks in the ring current

Perez, J. D.; Goldstein, J.; McComas, D. J.; Valek, P.; Buzulukova, N.; Fok, M. -C.; Singer, H. J. (2020-06-05)

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, ...