J. D. Huba

Syntek Technologies (United States)

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Alex T. Chartier

Johns Hopkins University Applied Physics Laboratory

193

Josh Steele

Sandia National Laboratories California

189

J. Krall

United States Naval Research Laboratory

G. Joyce

University of Botswana

P. A. Bernhardt

University of Alaska Fairbanks

Ioannis A. Daglis

National and Kapodistrian University of Athens

Shing F. Fung

Goddard Space Flight Center

D. Vassiliadis

NOAA National Environmental Satellite Data and Information Service

S. L. Ossakow

United States Naval Research Laboratory

S. Sazykin

Rice University

Cooperative Institutions

United States Naval Research Laboratory

152

Goddard Space Flight Center

116

University of Colorado Boulder

University of Maryland, College Park

University of California, Berkeley

Johns Hopkins University Applied Physics Laboratory

University of Michigan–Ann Arbor

Laboratory for Atmospheric and Space Physics

United States Navy

Massachusetts Institute of Technology

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The upper transition height over the Kharkiv incoherent scatter radar before, during and after the extreme minimum of the solar activity: Observational results and comparison with the IRI-2012 model

EGU General Assembly Conference Abstracts (2014)

Dmytro Kotov Vladimír Truhlík Philipp Richards J. D. Huba Л. Ф. Черногор

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On the role of the lower hybrid drift instability in substorm dynamics

Journal of Geophysical Research Atmospheres (1981)

J. D. Huba N. T. Gladd J. F. Drake

Recent studies of the lower hybrid drift instability have shed new light on the role of this mode in field reversed plasmas. For substorm magnetotail conditions we find that the lower hybrid drift instability can penetrate to the neutral line and can dissipate magnetic energy at a rate W B ≃4 × 10 17 erg/s. Thus this instability is capable of playing a major role in the onset of substorms and providing resistivity for reconnection processes in the context of the neutral line substorm model.

Substorm

10.1029/ja086ia07p05881

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Citations (60)

Modeling longitudinal variations the low latitude ionosphere

AGU Fall Meeting Abstracts (2006)

S. England T. J. Immel J. D. Huba S. B. Mende

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Impact of the Bastille Day Solar Flare on the Low- to Mid-Latitude Ionosphere

AGU Fall Meeting Abstracts (2004)

J. D. Huba H. Warren G. Joyce

Solar flare

Low latitude

Flare

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Mid-Latitude Ionospheric Response to Storm Time Electric Field

AGU Fall Meeting Abstracts (2004)

M. Swisdak G. Joyce J. D. Huba

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Observation and theory of the barium releases from the CRRES satellite

38th Aerospace Sciences Meeting and Exhibit (1992)

P. A. Bernhardt J. D. Huba W. A. Scales E. M. Wescott H. C. Stenbaek‐Nielsen

The relationship between releases of barium from the NASA Combined Release and Radiation Effects Satellite (CRRES) and enhanced auroral activity is discussed with reference to observational data. Barium releases were conducted at a variety of altitudes and injection velocities, and plasma irregularities are reported as a result of the interactions. Auroral activity increased within 5 min of each release, and references are made to the effects on diamagnetic cavities, bulk ion motion, and stimulated electron and ion precipitation. Artificially created structured diamagnetic cavities are noted for each release, plasma waves are generated by the high-speed ion clouds, and enhanced ionization is found in the critical ionization-velocity process. Barium releases are effective in stimulating electron precipitation, and the observed irregularities are related to cycloid bunching of the initial ion distributions.

Barium

10.2514/6.1992-789

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Citations (1)

Nonlocal theory of the Rayleigh–Taylor instability in the limit of unmagnetized ions

Physics of Fluids B Plasma Physics (1989)

J. D. Huba A. B. Hassam P. Satyanarayana

A nonlocal theory of the Rayleigh-Taylor instability is developed that applies to both magnetized and unmagnetized ion systems. The distinction between these two regimes is the time scale of the instability: for γ<Ωi the ions can be considered to be magnetized, and for γ>Ωi the ions can be considered to be unmagnetized, where γ is the growth rate and Ωi is the ion gyrofrequency. Both analytical and numerical results are presented that contrast the behavior of the Rayleigh-Taylor instability in these two regimes. In the long wavelength limit (kyLn≪1, where ky is the wavenumber and Ln is the density gradient scale length), it is found that the growth rate of the Rayleigh-Taylor instability in the unmagnetized ion limit is γ≂(kyg/A)1/2, where A is the Atwood number; this is quite different from the growth rate in the magnetized ion limit which is γ=(kygA)1/2. Another distinction between the two limits is that in the unmagnetized ion regime the fastest growing mode is not the lowest-order mode; again this is different from the magnetized ion regime in which the fastest growing mode is the lowest order mode. Finally, these results are applied to recent experimental observations (e.g., AMPTE [J. Geophys. Res. 92, 5777 (1987)], NRL laser experiment [Phys. Rev. Lett. 59, 2299 (1987)]).

Rayleigh–Taylor instability

Wavenumber

10.1063/1.859017

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Citations (24)

Thermospheric tidal effects on the ionospheric midlatitude summer nighttime anomaly

Japan Geoscience Union (2014)

Chia‐Hung Chen Chien‐Hung Lin Loren C. Chang J. D. Huba Akinori Saito

Middle latitudes

Anomaly (physics)

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Acceleration of Magnetospheric Relativistic Electrons by Ultra-Low Frequency Waves: A Comparison between Two Cases Observed by Cluster and LANL Satellites

AIP conference proceedings (2011)

Xi Shao Shing F. Fung L. C. Tan A. S. Sharma D. Vassiliadis

Understanding the origin and acceleration of magnetospheric relativistic electrons (MREs) in the Earth's radiation belt during geomagnetic storms is an important subject and yet one of outstanding questions in space physics. It has been statistically suggested that during geomagnetic storms, ultra‐low‐frequency (ULF) Pc‐5 wave activities in the magnetosphere are correlated with order of magnitude increase of MRE fluxes in the outer radiation belt. Yet, physical and observational understandings of resonant interactions between ULF waves and MREs remain minimum. In this paper, we show two events during storms on September 25, 2001 and November 25, 2001, the solar wind speeds in both cases were >500 km s−1 while Cluster observations indicate presence of strong ULF waves in the magnetosphere at noon and dusk, respectively, during a∼3‐hour period. MRE observations by the Los Alamos (LANL) spacecraft show a quadrupling of 1.1–1.5 MeV electron fluxes in the September 25, 2001 event, but only a negligible increase in the November 25, 2001 event. We present a detailed comparison between these two events. Our results suggest that the effectiveness of MRE acceleration during the September 25, 2001 event can be attributed to the compressional wave mode with strong ULF wave activities and the physical origin of MRE acceleration depends more on the distribution of toroidal and poloidal ULF waves in the outer radiation belt.

Van Allen Probes

Pitch angle

Ultra low frequency

10.1063/1.3544334

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Modeling Storm-Time Ionospheric Dynamics with RCM-SAMI3: Progress and Challenges

AGUFM (2012)

S. Sazykin J. D. Huba R. W. Spiro R. A. Wolf F. Toffoletto

Nowcasting

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