GUVI Biblio | guvitimed.jhuapl.edu

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Found 66 entries in the Bibliography.

Showing entries from 1 through 50

2022

Occurrence statistics of horse collar aurora

Bower, Gemma; Milan, Stephen; Paxton, Larry; Anderson, Brian;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2022 DOI:

Height-integrated polar cap conductances during an average substorm

Carter, Jennifer; Milan, Steven; Lester, Mark; Forsyth, Colin; Paxton, Larry; Gjerloev, Jesper; Anderson, Brian;

Published by: Published on:

YEAR: 2022 DOI:

Lobe Reconnection and Cusp-Aligned Auroral Arcs

Abstract Following the St. Patrick s Day (17 March) geomagnetic storm of 2013, the interplanetary magnetic field had near-zero clock angle for almost two days. Throughout this period multiple cusp-aligned auroral arcs formed in the polar regions; we present observations of, and provide a new explanation for, this poorly understood phenomenon. The arcs were observed by auroral imagers onboard satellites of the Defense Meteorological Satellite Program. Ionospheric flow measurements and observations of energetic particles from ...

Milan, S.; Bower, G.; Carter, J.; Paxton, L.; Anderson, B.; Hairston, M.;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2022 DOI: https://doi.org/10.1029/2021JA030089

Impact of Soft Electron Precipitation on the Thermospheric Neutral Mass Density During Geomagnetic Storms: GITM Simulations

In this study, the impact of improving soft (0.1–1 keV) electron precipitation on the F-region neutral mass density has been evaluated using the Global Ionosphere Thermosphere Model (GITM). Two types of electron energy spectra having the same total energy flux and average energy but different spectral shapes have been used to specify the electron precipitation in GITM. One is the Maxwellian spectrum and the other is from an empirical model, Auroral Spectrum and High-Latitude Electric field variabilitY (ASHLEY), which provi ...

Zhu, Qingyu; Deng, Yue; Sheng, Cheng; Anderson, Philip; Bukowski, Aaron;

Published by: Geophysical Research Letters Published on:

YEAR: 2022 DOI: 10.1029/2021GL097260

ASHLEY; GITM; neutral mass density; soft electron precipitation

2021

Field-Aligned Current During an Interval of BY-Dominated Interplanetary-Field; Modeled-to-Observed Comparisons

Carter, Jennifer; Samsonov, AA; Milan, Stephen; Branduardi-Raymont, Graziella; Ridley, Aaron; Paxton, Larry; Anderson, Brian; Waters, Colin; Edwards, Thomas;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2021 DOI:

Field-aligned current during an interval of $$\backslash$rm B\_ $\$Y$\$ $-dominated interplanetary-field; modeled-to-observed comparisons

Carter, Jennifer; Samsonov, Andrey; Milan, Stephen; Branduardi-Raymont, Graziella; Ridley, Aaron; Paxton, Larry; Anderson, Brian; Waters, Colin; Edwards, Thomas;

Published by: Earth and Space Science Open Archive ESSOAr Published on:

YEAR: 2021 DOI:

Dual-lobe reconnection and cusp-aligned auroral arcs

Milan, Stephen; Bower, Gemma; Carter, Jennifer; Paxton, Larry; Anderson, Brian; Hairston, Marc;

Published by: Published on:

YEAR: 2021 DOI:

Determination of Auroral Electrodynamic Parameters From AMPERE Field-Aligned Current Measurements

We calculate high latitude electrodynamic parameters using global maps of field-aligned currents from the Active Magnetosphere and Planetary Response Experiment (AMPERE). The model is based on previous studies that relate field-aligned currents to auroral Pedersen and Hall conductances measured by incoherent scatter radar. The field-aligned currents and conductances are used to solve for the electric potential at high latitudes from which electric fields are computed. The electric fields are then used with the conductances t ...

Robinson, R.; Zanetti, Larry; Anderson, Brian; Vines, Sarah; Gjerloev, Jesper;

Published by: Space Weather Published on:

YEAR: 2021 DOI: 10.1029/2020SW002677

space weather; auroral currents; auroral electrodynamics; conductivities; electric fields; field-aligned currents

2020

Bifurcated Region 2 Field-Aligned Currents Associated With Substorms

Sangha, H; Milan, SE; Carter, JA; Fogg, AR; Anderson, BJ; Korth, H; Paxton, LJ;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2020 DOI:

Height-Integrated Ionospheric Conductances Parameterized By Interplanetary Magnetic Field and Substorm Phase

Carter, JA; Milan, SE; Paxton, LJ; Anderson, BJ; Gjerloev, J;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2020 DOI:

Statistical relations between auroral electrical conductances and field-aligned currents at high latitudes

Robinson, RM; Kaeppler, Stephen; Zanetti, Larry; Anderson, Brian; Vines, Sarah; Korth, Haje; Fitzmaurice, Anna;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2020 DOI:

Bifurcated region 2 field-aligned currents associated with substorms

Sangha, H; Milan, SE; Carter, JA; Fogg, AR; Anderson, BJ; Korth, H; Paxton, LJ;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2020 DOI:

The evolution of long-duration cusp spot emission during lobe reconnection with respect to field-aligned currents

Carter, Jennifer; Milan, Stephen; Fogg, Alexandra; Sangha, Harneet; Lester, Mark; Paxton, Larry; Anderson, Brian;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2020 DOI:

Dual-lobe reconnection and horse-collar auroras

Milan, Stephen; Carter, Jennifer; Bower, Gemma; Imber, Suzanne; Paxton, Larry; Anderson, Brian; Hairston, Marc; Hubert, Benoit;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2020 DOI:

2019

Global-Scale Observations of the Equatorial Ionization Anomaly

The National Aeronautics and Space Administration Global-scale Observations of the Limb and Disk ultraviolet spectrograph has been imaging the equatorial ionization anomaly (EIA), regions of the ionosphere with enhanced electron density north and south of the magnetic equator, since October 2018. The initial 3 months of observations was during solar minimum conditions, and they included observations in December solstice of unanticipated variability and depleted regions. Depletions are seen on most nights, in contrast to e ...

Eastes, R.; Solomon, S.; Daniell, R.; Anderson, D.; Burns, A.; England, S.; Martinis, C.; McClintock, W.;

Published by: Geophysical Research Letters Published on: 08/2019

YEAR: 2019 DOI: 10.1029/2019GL084199

Global-scale observations of the equatorial ionization anomaly

Eastes, RW; Solomon, SC; Daniell, RE; Anderson, DN; Burns, AG; England, SL; Martinis, CR; McClintock, WE;

Published by: Geophysical Research Letters Published on:

YEAR: 2019 DOI:

Global-scale Observations of the Equatorial Ionization Anomaly

Solomon, RW; Daniell, RE; Anderson, DN; Burns, AG; England, SL; Martinis, CR; McClintock, WE;

Published by: Published on:

YEAR: 2019 DOI:

2018

Statistical Relations Between Field-Aligned Currents and Precipitating Electron Energy Flux

Measurements of field-aligned currents from the Active Magnetosphere and Planetary Electrodynamics Response Experiment are combined with measurements of far ultraviolet emissions from the Global Ultraviolet Imager on the Thermosphere-Ionosphere-Mesosphere Energetics and Dynamics satellite to examine the correlation between parallel currents and auroral electron energy flux. The energy flux is derived from the far ultraviolet emissions in the N₂ Lyman-Birge-Hopfield bands. We find that energy flux correlates wit ...

Robinson, R.; Zhang, Y.; Anderson, B.; Zanetti, L.; Korth, H.; Fitzmaurice, A.;

Published by: Geophysical Research Letters Published on: 08/2018

YEAR: 2018 DOI: 10.1029/2018GL078718

Driving of strong nightside reconnection and geomagnetic activity by polar cap flows: application to CME shocks and possibly other situations

Lyons, LR; Gallardo-Lacourt, B; Zou, Y; Nishimura, Y; Anderson, P; , Angelopoulos; Donovan, EF; Ruohoniemi, JM; Mitchell, E; Paxton, LJ; , others;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on:

YEAR: 2018 DOI:

The association of high-latitude dayside aurora with NBZ field-aligned currents

Carter, JA; Milan, SE; Fogg, AR; Paxton, LJ; Anderson, BJ;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2018 DOI:

Statistical relations between field-aligned currents and precipitating electron energy flux

Robinson, RM; Zhang, Y; Anderson, BJ; Zanetti, LJ; Korth, H; Fitzmaurice, A;

Published by: Geophysical Research Letters Published on:

YEAR: 2018 DOI:

2017

The Global-Scale Observations of the Limb and Disk (GOLD) Mission

The Earth\textquoterights thermosphere and ionosphere constitute a dynamic system that varies daily in response to energy inputs from above and from below. This system can exhibit a significant response within an hour to changes in those inputs, as plasma and fluid processes compete to control its temperature, composition, and structure. Within this system, short wavelength solar radiation and charged particles from the magnetosphere deposit energy, and waves propagating from the lower atmosphere dissipate. Understand ...

Eastes, R.; McClintock, W.; Burns, A.; Anderson, D.; Andersson, L.; Codrescu, M.; Correira, J.; Daniell, R.; England, S.; Evans, J.; Harvey, J.; Krywonos, A.; Lumpe, J.; Richmond, A.; Rusch, D.; Siegmund, O.; Solomon, S.; Strickland, D.; Woods, T.; Aksnes, A.; Budzien, S.; Dymond, K.; Eparvier, F.; Martinis, C.; Oberheide, J.;

Published by: Space Science Reviews Published on: 10/2017

YEAR: 2017 DOI: 10.1007/s11214-017-0392-2

Driving of Dramatic Geomagnetic Activity by Enhancement of Meso-Scale Polar-cap Flows

Lyons, Larry; Gallardo-Lacourt, Bea; Zou, Ying; Nishimura, Yukitoshi; Anderson, Phillip; Angelopoulos, VASSILIS; Ruohoniemi, Michael; Mitchell, Elizabeth; Paxton, Larry; Nishitani, Nozomu;

Published by: Published on:

YEAR: 2017 DOI:

The Global-scale Observations of the Limb and Disk (GOLD) mission

Eastes, RW; McClintock, WE; Burns, AG; Anderson, DN; Andersson, L; Codrescu, M; Correira, JT; Daniell, RE; England, SL; Evans, JS; , others;

Published by: Space Science Reviews Published on:

YEAR: 2017 DOI:

2016

Average field-aligned current configuration parameterised by solar wind conditions

We present the first large-scale comparison of the spatial distribution of field-aligned currents as measured by the Active Magnetosphere and Planetary Electrodynamics Response Experiment, with the location and brightness of the average auroral oval, determined from the Imager for Magnetopause-to-Aurora Global Exploration far ultraviolet instrument. These distributions are compared under the same interplanetary magnetic field magnitude and clock angle conditions. The field-aligned currents and auroral oval drop to lower l ...

Carter, J.; Milan, S.; Coxon, J.; Walach, M.-T.; Anderson, B.;

Published by: Journal of Geophysical Research: Space Physics Published on: 01/2016

YEAR: 2016 DOI: 10.1002/2015JA021567

auroral oval; field-aligned currents

Nightside storm-time Birkeland currents: quasi-steady state, onsets, and dual R1/2 sense pairs

Anderson, BJ; Korth, H; Paxton, LJ; Olson, C; Waters, CL; Barnes, RJ; Gjerloev, JW;

Published by: Published on:

YEAR: 2016 DOI:

Average field-aligned current configuration parameterized by solar wind conditions

Carter, JA; Milan, Stephen; Coxon, JC; Walach, M-T; Anderson, BJ;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2016 DOI:

Nightside storm-time Birkeland currents: quasi-steady state, onsets, and dual R1/2 sense pairs

Korth, Haje; Anderson, Brian; Paxton, Larry; Olson, Cameron; Waters, Colin; Barnes, Robin; Gjerloev, Jesper;

Published by: Published on:

YEAR: 2016 DOI:

Ionospheric data assimilation and forecasting during storms

Chartier, Alex; Matsuo, Tomoko; Anderson, Jeffrey; Collins, Nancy; Hoar, Timothy; Lu, Gang; Mitchell, Cathryn; Coster, Anthea; Paxton, Larry; Bust, Gary;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2016 DOI:

2015

Towards a National Space Weather Predictive Capability

Fox, Nicola; Ryschkewitsch, Michael; Merkin, Viacheslav; Stephens, Grant; Gjerloev, Jesper; Barnes, Robin; Anderson, Brian; Paxton, Larry; Ukhorskiy, Aleksandr; Kelly, Michael; , others;

Published by: Published on:

YEAR: 2015 DOI:

2014

Comparative studies of theoretical models in the equatorial ionosphere

Fang, Tzu-Wei; Anderson, David; Fuller-Rowell, Tim; Akmaev, Rashid; Codrescu, Mihail; Millward, George; Sojka, Jan; Scherliess, Ludger; Eccles, Vince; Retterer, John; , others;

Published by: Modeling the ionosphere—thermosphere system Published on:

YEAR: 2014 DOI:

Towards a National Space Weather Predictive Capability

Lindstrom, Kurt; Fox, Nicola; Ryschkewitsch, Michael; Anderson, Brian; Gjerloev, Jesper; Merkin, Viacheslav; Kelly, Michael; Miller, Ethan; Sitnov, Mikhail; Ukhorskiy, Aleksandr; , others;

Published by: Published on:

YEAR: 2014 DOI:

Statistical relationship between large-scale upward field-aligned currents and electron precipitation

Simultaneous observations of Birkeland currents by the constellation of Iridium satellites and N2 Lyman\textendashBirge\textendashHopfield (LBH) auroral emissions measured by the Global Ultraviolet Imager (GUVI) onboard the Thermosphere, Ionosphere, and Mesosphere Energetics and Dynamics (TIMED) satellite are used to establish relationships between large-scale upward field-aligned currents and electron precipitation during stable current configurations. The electron precipitation was inferred from GUVI data using a statis ...

Korth, Haje; Zhang, Yongliang; Anderson, Brian; Sotirelis, Thomas; Waters, Colin;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2014 DOI: 10.1002/2014JA019961

Birkeland Currents; Auroral Emissions; electron precipitation; Current-Precipitation Relationship; Current-Voltage Relationship

Towards a National Space Weather Predictive Capability

Fox, NJ; Lindstrom, KL; Ryschkewitsch, MG; Anderson, BJ; Gjerloev, JW; Merkin, VG; Kelly, MA; Miller, ES; Sitnov, MI; Ukhorskiy, AY; , others;

Published by: Published on:

YEAR: 2014 DOI:

2013

The Science of the Global-scale measurements of the Limb and Disk (GOLD) Mission

Burns, AG; Eastes, R; McClintock, WE; Solomon, SC; Anderson, DN; Andersson, L; Codrescu, M; Daniell, RE; Harvey, J; Krywonos, A; , others;

Published by: Published on:

YEAR: 2013 DOI:

2012

Forcing the TIEGCM model with Birkeland currents from the Active Magnetosphere and Planetary Electrodynamics Response Experiment

Marsal, S.; Richmond, A.; Maute, A.; Anderson, B.;

Published by: Journal of Geophysical Research Published on: Jan-01-2012

YEAR: 2012 DOI: 10.1029/2011JA017416

Assimilation of FORMOSAT-3/COSMIC electron density profiles into a coupled thermosphere/ionosphere model using ensemble Kalman filtering

This paper presents our effort to assimilate FORMOSAT-3/COSMIC (F3/C) GPS Occultation Experiment (GOX) observations into the National Center for Atmospheric Research (NCAR) Thermosphere Ionosphere Electrodynamics General Circulation Model (TIE-GCM) by means of ensemble Kalman filtering (EnKF). The F3/C electron density profiles (EDPs) uniformly distributed around the globe which provide an excellent opportunity to monitor the ionospheric electron density structure. The NCAR TIE-GCM simulates the Earth\textquoterights ther ...

Lee, I.; Matsuo, T.; Richmond, A.; Liu, J; Wang, W.; Lin, C.; Anderson, J.; Chen, M.;

Published by: Journal of Geophysical Research Published on: 10/2012

YEAR: 2012 DOI: 10.1029/2012JA017700

data assimilation; ensemble Kalman filter; FORMOSAT-3/COSMIC; Ionosphere

Global-scale Observations of the Limb and Disk (GOLD)

Eastes, R; McClintock, W; Aksnes, A; Anderson, D; Andersson, L; Burns, A; Budzien, S; Codrescu, M; Daniell, R; Dymond, K; , others;