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Intermediate shocks in three-dimensional magnetohydrodynamic bow-shock flows with multiple interacting shock fronts

Cable, S.; Lin, Y.; Holloway, J. L.; 0000-0001-8003-9252 (2020-06-18)

Previous MHD simulations predict that when switch-on shock conditions obtain in the solar wind, the bow shock produced in front of an ellipsoidal obstacle will produce a unique bow shock configuration that includes a concave ...

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, ...

Hybrid simulation of foreshock waves and ion spectra and their linkage to cusp energetic ions

Wang, X. Y.; Lin, Y.; Chang, S. -W.; 0000-0001-5533-5981; 0000-0001-8003-9252 (2020-06-16)

A three-dimensional global hybrid simulation is carried out to investigate energetic ions and electromagnetic waves in the quasi-parallel (Q-parallel to) bow shock and cusp for a typical interplanetary magnetic field ...

Three-dimensional hybrid simulation of magnetosheath reconnection under northward and southward interplanetary magnetic field

Pang, Y.; Lin, Y.; Deng, X. H.; Wang, X. Y.; Tan, B.; 0000-0001-8003-9252; 0000-0001-5533-5981 (2020-06-16)

A three-dimensional (3-D) global hybrid simulation is carried out for the generation and structure of magnetic reconnection in the magnetosheath because of the interaction of an interplanetary tangential discontinuity (TD) ...

Hybrid simulation of mode conversion at the magnetopause

Lin, Y.; Johnson, J. R.; Wang, X. Y.; 0000-0001-8003-9252; 0000-0001-5533-5981 (2020-06-16)

Two-dimensional hybrid simulations are used to investigate how fast-mode compressional waves incident on a magnetopause current layer mode convert both linearly and nonlinearly to short wavelength (k(perpendicular to)rho(i) ...

Laser Ar-40/Ar-39 age constraints on Miocene sequences from the Bengal basin: Implications for middle Miocene denudation of the eastern Himalayas

Uddin, Ashraf; Hames, Willis E.; Zahid, Khandaker M. (2020-06-16)

Petrographic, mineral-chemistry and subsurface studies reveal that orogenic sedimentation had already begun in the Bengal basin by the early Miocene. Laser Ar-40/Ar-39 age determinations were made for detrital muscovite ...

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 ...

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-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 ...

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 ...

Magnetic flux rope formation within a magnetosheath hot flow anomaly

Hasegawa, H.; Zhang, H.; Lin, Y.; Sonnerup, B. U. O.; Schwartz, S. J.; Lavraud, B.; Zong, Q. -G.; 0000-0001-8003-9252 (2020-06-09)

We report observations on 1 March 2004 by the Cluster spacecraft of a hot flow anomaly (HFA) encountered in the dayside magnetosheath near Earth's bow shock. Embedded within the HFA was a magnetic flux rope with a diameter ...

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, ...

Pickup proton instabilities and scattering in the distant solar wind and the outer heliosheath: Hybrid simulations

Liu, Kaijun; Mobius, Eberhard; Gary, S. Peter; Winske, Dan; 0000-0001-5882-1328 (2020-06-09)

The growth of magnetic field fluctuations driven by the injection of pickup ions perpendicular to a background magnetic field in a homogeneous, collisionless plasma is studied using one-dimensional hybrid simulations. ...

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 ...

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 ...

College of Sciences and Mathematics: Recent submissions