Bibliography

Large-Scale Traveling Atmospheric and Ionospheric Disturbances Observed in GUVI With Multi-Instrument Validations

This study presents multi-instrument observations of persistent large-scale traveling ionosphere/atmospheric disturbances (LSTIDs/LSTADs) observed during moderately increased auroral electrojet activity and a sudden stratospheric warming in the polar winter hemisphere. The Global Ultraviolet Imager (GUVI), Gravity field and steady-state Ocean Circulation Explorer, Scanning Doppler Imaging Fabry–Perot Interferometers, and the Poker Flat Incoherent Scatter Radar are used to demonstrate the presence of LSTIDs/LSTADs between 19 UT and 5 UT on 18–19 January 2013 over the Alaska region down to lower midlatitudes. This study showcases the first use of GUVI for the study of LSTADs. These novel GUVI observations demonstrate the potential for the GUVI far ultraviolet emissions to be used for global-scale studies of waves and atmospheric disturbances in the thermosphere, a region lacking in long-term global measurements. These observations typify changes in the radiance from around 140 to 180 km, opening a new window into the behavior of the thermosphere.

Bossert, Katrina; Paxton, Larry; Matsuo, Tomoko; Goncharenko, Larisa; Kumari, Komal; Conde, Mark;

Published by: Geophysical Research Letters      Published on:

YEAR: 2022     DOI: 10.1029/2022GL099901

Observations of Spatial Variations in O/N ₂ During an Auroral Substorm Using the Multichannel Downlooking Camera on the VISIONS Rocket

At 0821 UT on 7 February 2013, during an auroral substorm, the NASA VISIONS rocket was launched northward from Poker Flat Research Range on a flight to approximately 750-km altitude that terminated in the Arctic Ocean. A subpayload jettisoned on the up leg carried a multichannel optical imager that looked downward and observed the auroral emission through four narrow passband filters. Three of the channels had sufficiently strong signal to allow a measure of the time evolution of the horizontal extent of the electron aurora and changes in the ratio of the column O to the column N₂. These data revealed rather rapid changes in this measure of composition over an area larger than would be expected from the changes expected from particle and Joule heating. Although such rapid large changes have been observed previously, and Christensen et al. (1997, https://doi.org/10.1029/97JA01800) had hypothesized that they were due to enhanced turbulent diffusion, this imaging experiment is the first to show their evolution over a large area. On the down leg the camera was able to see the vertical spatial extent of the auroral emission which is consistent with the decrease in O/N₂ seen in the downlooking data. The change in this ratio with altitude suggests the deposition of an additional number of low-energy electrons that would cause a larger decrease in that ratio at higher altitudes.

Hecht, J.; Clemmons, J.; Conde, M.; Hampton, D.; Michell, R.; Rowland, D.; Pfaff, R.; Walterscheid, R.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 07/2018

YEAR: 2018     DOI: 10.1029/2018JA025288

Thermospheric wind and temperature fields observed using two ground based all-sky imaging Fabry-Perot spectrometers in Antarctica

Conde, Mark; Bristow, William; Hampton, Donald; Kosch, Michael; Ishii, Mamoru; Paxton, Larry; Davies, Theo;

Published by:       Published on:

YEAR: 2016     DOI:

A multiyear (2002--2006) climatology of O/N2 in the lower thermosphere from TIMED GUVI and ground-based photometer observations

Hecht, J.; Mulligan, T.; Correira, J.; Clemmons, J.; Strickland, D.; Walterscheid, R.; Conde, M.;

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

YEAR: 2012     DOI: 10.1029/2011JA017146

The Horizontal E-region Experiment: Evidence for inertial instability on the evening side of the auroral oval?

Larsen, M.; Conde, M.;

Published by: Geophysical Research Letters      Published on: Jan-09-2011

YEAR: 2011     DOI: 10.1029/2011GL048424

A Multi-Year (2002-2006) Climatology of O/N2 in the Lower Thermosphere from TIMED GUVI and Ground-Based Photometer Data

Hecht, JH; Mulligan, T; Clemmons, JH; Strickland, DJ; Correira, J; Conde, MG;

Published by:       Published on:

YEAR: 2010     DOI:

The Armada mission: Determining the dynamic and spatial response of the thermosphere/ionosphere system to energy inputs on global and regional scales

Ridley, AJ; Forbes, JM; Cutler, J; Nicholas, AC; Thayer, JP; Fuller-Rowell, TJ; Matsuo, T; Bristow, WA; Conde, MG; Drob, DP; , others;

Published by:       Published on:

YEAR: 2010     DOI:

Satellite and ground-based observations of auroral energy deposition and the effects on thermospheric composition during large geomagnetic storms: 1. Great geomagnetic storm of 20 November 2003

Hecht, JH; Mulligan, T; Strickland, DJ; Kochenash, AJ; Murayama, Y; Tanaka, Y-M; Evans, DS; Conde, MG; Donovan, EF; Rich, FJ; , others;

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

YEAR: 2008     DOI:

The application of ground-based optical techniques for inferring electron energy deposition and composition change during auroral precipitation events

Hecht, J.H.; Strickland, D.J.; Conde, M.G.;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: Jan-09-2006

YEAR: 2006     DOI: 10.1016/j.jastp.2005.06.022

The HEX experiment: Determination of the neutral wind field from 120 to 185 km altitude near a stable premidnight auroral arc by triangulating the drift of rocket-deployed chemical trails

Wescott, E.; Stenbaek-Nielsen, H.; Conde, M.; Larsen, Miguel; Lummerzheim, Dirk;

Published by: Journal of Geophysical Research      Published on: Jan-01-2006

YEAR: 2006     DOI: 10.1029/2005JA011002

Composition Change in the Lower Thermosphere during the Great Magnetic Storm of November 20 2003 from TIMED Ground-Based and GUVI Observations

Hecht, JH; Strickland, DJ; Conde, MG; Morrison, MD;

Published by:       Published on:

YEAR: 2004     DOI:

Products Derived From GUVI Auroral Data and Comparisons With Ground-Based Results From Poker Flat and Ft. Yukon, AK

Strickland, DJ; Hecht, JH; Meier, RR; Conde, M; Christensen, AB; Morrison, D;

Published by:       Published on:

YEAR: 2003     DOI:

Comparison of the Modeled 135.6 nm Auroral Emission to TIMED GUVI Observations: Mapping Thermospheric Composition Variations During Auroral Events Above Alaska and Northwest Canada

Krynicki, MP; Conde, M; Lummerzheim, D; Paxton, L; Ishii, M;

Published by:       Published on:

YEAR: 2003     DOI:

Thermospheric wind, temperature, and compositional response to auroral events above Alaska and Western Canada

Conde, MG; Krynicki, MP; Lummerzheim, D;

Published by:       Published on:

YEAR: 2002     DOI:

Composition Change in the Lower Thermosphere Over Alaska from TIMED/CEDAR Ground-Based and GUVI Observations

Hecht, JH; Strickland, DJ; Conde, MG;

Published by:       Published on:

YEAR: 2002     DOI:

Wind-driven transport of thermospheric air parcels in the auroral zone

Data from ground-based optical instruments at Poker Flat and Fort Yukon in Alaska recorded during 2010 were used to examine the relationship between composition changes in the auroral thermosphere and transport effects by neutral winds. Thermospheric column [O]/[N2] estimates were obtained from a pair of four-channel zenith-pointed narrow field photometers located at Poker Flat and Fort Yukon, whereas neutral winds at E and F-region heights were measured using an all-sky imaging Fabry-Perot spectrometer at Poker Flat. Wind fields were obtained over a spatial region around 1400 km in diameter in the F-region, or 700 km in the E-region, with a cadence of one observation every few minutes. We focus in particular on a sustained depletion of column [O]/[N2] observed during the minor storm period of April 4-8, 2010. While various correlated events were noted, no systematic relation was found between between horizontal winds and the column [O]/[N2] during this period (or indeed on any of the several tens of other days that we examined.) However during the storm there was a very obvious increase in activity of vertical winds, horizontal divergence, and associated wave activity. We suggest that the long-lived decrease in column [O]/[N2] during the storm was due to vertical mixing being enhanced by a process akin to eddy diffusion. This is in contrast to the more typical picture of localized “upwellings” being driven by Joule heating, and then carrying molecular species aloft

Conde, Mark; Hecht, James; Anderson, Callum;

Published by:       Published on:

YEAR: 0     DOI: