Search Results - "Horwitz, J L"

Stellar ablation of planetary atmospheres by Moore, T. E., Horwitz, J. L.

“…We review observations and theories of the solar ablation of planetary atmospheres, focusing on the terrestrial case where a large magnetosphere holds off the…”
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Physics-based formula representations of high-latitude ionospheric outflows: H+ and O+ densities, flow velocities, and temperatures versus soft electron precipitation, wave-driven transverse heating, and solar zenith angle effects by Horwitz, J. L., Zeng, W.

“…Extensive systematic dynamic fluid kinetic (DyFK) model simulations are conducted to obtain advanced simulation‐based formula representations of ionospheric…”
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Heavy ion mass loading of the geomagnetic field near the plasmapause and ULF wave implications by Fraser, B. J., Horwitz, J. L., Slavin, J. A., Dent, Z. C., Mann, I. R.

“…The structure of the density discontinuity across the plasmapause is often based on electron and H+ density profiles with the contribution of heavy ions (He+,…”
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Storm enhanced densities (SED) as possible sources for Cleft Ion Fountain dayside ionospheric outflows by Zeng, W., Horwitz, J. L.

“…Foster et al. (2002) and others have reported on elevated ionospheric density regions being convected from the subauroral plasmaspheric region toward noon, in…”
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Formula representation of auroral ionospheric O+ outflows based on systematic simulations with effects of soft electron precipitation and transverse ion heating by Zeng, W., Horwitz, J. L.

“…Systematic Dynamic Fluid Kinetic (DyFK) model simulations are conducted to obtain a simulation‐based formula representation of the O+ outflow flux level versus…”
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Simulation of the formation of O+ density troughs at 6000 km altitude in the polar cap ionosphere-magnetosphere region by Jaafari, Fajer, Horwitz, J. L., Zeng, W.

“…Spacecraft‐based in situ observations have indicated considerable variability in O+ densities in the polar cap ionosphere‐magnetosphere region near 6000 km…”
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Characteristic ion distributions in the dynamic auroral transition region by Zeng, W., Horwitz, J. L., Tu, J.-N.

“…A Dynamic Fluid Kinetic (DyFK) simulation is conducted to study the H+/O+ flows and distribution functions in the high‐latitude dynamic transition region,…”
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Generation of short-burst radiation through Alfvénic acceleration of auroral electrons by Su, Yi-Jiun, Ergun, R. E., Jones, S. T., Strangeway, R. J., Chaston, C. C., Parker, S. E., Horwitz, J. L.

“…A comparison of modeled simulation results with in situ observations is presented in an effort to better understand the generation mechanism of short‐burst…”
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Formation of density troughs embedded in the outer plasmasphere by subauroral ion drift events by Ober, Daniel M., Horwitz, J. L., Gallagher, D. L.

“…A dynamic global core plasma model (DGCPM) is used to investigate the effects of subauroral ion drift (SAID) events on the formation of trough density profiles…”
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Polar wind survey with the Thermal Ion Dynamics Experiment/Plasma Source Instrument suite aboard POLAR by Su, Yi‐Jiun, Horwitz, J. L., Moore, T. E., Giles, B. L., Chandler, M. O., Craven, P. D., Hirahara, M., Pollock, C. J.

“…In February 1996, the POLAR spacecraft was placed in an elliptical orbit with a 9 RE geocentric distance apogee in the northern hemisphere and 1.8 RE perigee…”
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Simulation of the POLAR-observed Geomagnetic Ion Energy Spectrometer by Zeng, W., Horwitz, J. L., Elliott, H. A., Moore, T. E.

“…Observations by polar‐orbiting spacecraft of outward streaming ionospheric O+ ions in the polar cap magnetosphere often show decreasing field‐aligned streaming…”
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Simulation of polar cap field-aligned electron density profiles measured with the IMAGE radio plasma imager by Tu, J.-N., Horwitz, J. L., Nsumei, P. A., Song, P., Huang, X.-Q., Reinisch, B. W.

“…The radio plasma imager (RPI) on board the IMAGE satellite measured a set of field‐aligned electron density profiles at polar latitudes during a weak magnetic…”
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Simulating plasmaspheric field-aligned density profiles measured with IMAGE/RPI: Effects of plasmasphere refilling and ion heating by Tu, J.-N., Horwitz, J. L., Song, P., Huang, X.-Q., Reinisch, B. W., Richards, P. G.

“…The radio plasma imager (RPI) on board the IMAGE satellite measures electron density profiles along magnetic lines through radio sounding techniques. We…”
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Statistical relationships between high-latitude ionospheric F region/topside upflows and their drivers: DE 2 observations by Seo, Y., Horwitz, J. L., Caton, R.

“…A statistical analysis is conducted on the relationships among high‐latitude topside (850 – 950 km altitude) ionospheric plasma parameters and precipitating…”
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Systematic modeling of soft-electron precipitation effects on high-latitude F region and topside ionospheric upflows by Su, Y.‐J., Caton, R. G., Horwitz, J. L., Richards, P. G.

“…An ionospheric plasma fluid transport model is used to investigate the effects of soft (<1 keV) electron precipitation on high‐latitude F region/topside…”
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Dynamic fluid kinetic (DyFK) simulation of auroral ion transport: Synergistic effects of parallel potentials, transverse ion heating, and soft electron precipitation by Wu, X.-Y., Horwitz, J. L., Tu, J.-N.

“…Ion outflow processes along auroral field lines are simulated with a dynamic fluid kinetic (DyFK) model which couples a comprehensive fluid ionospheric…”
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The O+ density trough at 5000 km altitude in the polar cap by Zeng, W., Horwitz, J. L., Craven, P. D., Rich, F. J., Moore, T. E.

“…At altitudes near 5000 km over the southern polar cap region of the terrestrial magnetosphere/ionosphere, the Thermal Ion Dynamics Experiment (TIDE) on board…”
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Achieving zero current for polar wind outflow on open flux tubes subjected to large photoelectron fluxes by Wilson, G. R., Khazanov, G., Horwitz, J. L.

“…In this study we investigate how the condition of zero current on open flux tubes with polar wind outflow, subjected to large photoelectron fluxes, can be…”
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Statistical analysis of F region and topside ionospheric ion field-aligned flows at high latitudes by Wu, X.‐Y., Horwitz, J. L., Seo, Y.

“…A statistical examination is made of ionospheric ion field‐aligned flow velocities, ion densities, and electron and ion temperatures as measured at high…”
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Dynamic fluid-kinetic (DyFK) modeling of auroral plasma outflow driven by soft electron precipitation and transverse ion heating by Wu, X.‐Y., Horwitz, J. L., Estep, G. M., Su, Y.‐J., Brown, D. G., Richards, P. G., Wilson, G. R.

“…We apply a recently developed dynamic fluid‐kinetic (DyFK) model to simulate and investigate the effects of soft auroral electron precipitation and…”
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