Bibliography

The Low-Latitude Ionosphere/Thermosphere Enhancements in Density (LLITED) Mission

Bishop, Rebecca; Walterscheid, Richard; Clemmons, James; Barjatya, Aroh; Gunter, Liam;

Published by:       Published on:

YEAR: 2019     DOI:

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

Richard Walterscheid1 1The Aerospace Corporation 2Embry-Riddle Aeronautical University

Bishop, Rebecca; Clemmons, James; Barjatya, Aroh;

Published by:       Published on:

YEAR: 2017     DOI:

RENU 2 UV Measurements of Atomic Oxygen in the Cusp Region

Fritz, Bruce; Lessard, Marc; Paxton, Larry; Cook, Timothy; Lynch, Kristina; Clemmons, James; Hecht, James; Hysell, David; Crowley, Geoff;

Published by:       Published on:

YEAR: 2016     DOI:

Rapid, highly structured meridional winds and their modulation by non migrating tides: Measurements from the Streak mission

[1]\ Measurements of the Earth\textquoterights low latitude thermosphere returned by the ionization gauge on the Streak mission are reported and discussed. The measurements are of the amount of gas rammed into the sensor by its passage through the thermospheric medium. They were obtained in the dusk sector in the altitude range 130\textendash330 km and are shown to be strongly structured by the geomagnetic field. Similarities to the structure of the equatorial ionization anomaly are discussed. The structure is interpreted as being due to rapid (several hundred meters per second) meridional winds having an antisymmetric pattern with respect to the geomagnetic equator. The measurements are interpreted in light of results from other missions and are shown to fit well with ideas based on complementary measurements from the Dynamics Explorer 2 mission discussed as the Equatorial Temperature and Wind Anomaly. Several features of these winds are described and discussed, including their altitude dependence, how they form convection cells that extend to high latitude, and how the wind amplitudes vary with geographic longitude with an apparent wavenumber one variation. The latter characteristic is shown to be consistent with being the signature of tidal variations observed by others. Approximate calculations utilizing published values for the pertinent parameters are used to show that heating from the dissipation due to ion drag within the ionospheric F region is a dominant driver of the inferred winds.

Clemmons, J.; Walterscheid, R.; Christensen, A.; Bishop, R.;

Published by: Journal of Geophysical Research: Space Physics      Published on: 02/2013

YEAR: 2013     DOI: 10.1029/2012JA017661

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

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:

Thermospheric density in the Earth s magnetic cusp as observed by the Streak mission

Clemmons, JH; Hecht, JH; Salem, DR; Strickland, DJ;

Published by: Geophysical Research Letters      Published on:

YEAR: 2008     DOI:

Paired Ionosphere-Thermosphere Orbiters (PITO): Science and Implementation

Nigg, DA; Clemmons, JH; Walterscheid, RL; Jolly, R;

Published by: Americal Geophysical Union, Fall      Published on:

YEAR: 2008     DOI:

Space-based research into the ionosphere-thermosphere system: The need for greater organization and a plan for achieving it

Clemmons, JH; Crowley, G; Heelis, RA; Mannucci, AJ; Paxton, LJ; Pfaff, RF; Spann, JF;

Published by:       Published on:

YEAR: 2007     DOI:

Implications of Auroral Electron Precipitation During the JOULE Experiment

Slocum, PL; Clemmons, JH; Hecht, JH; Larsen, MF; Pfaff, RF; Steigies, CT; Stenbaek-Nielsen, HC; Strickland, DJ;

Published by:       Published on:

YEAR: 2005     DOI:

The Interaction of Auroral Electron Precipitation with the Thermosphere During the JOULE Experiment

Slocum, PL; Clemmons, JH; Hecht, JH; Pfaff, RF; Steigies, CT; Larsen, MF; Strickland, DJ;

Published by:       Published on:

YEAR: 2004     DOI:

The State of the Neutral Atmosphere and the Electron Precipitation During JOULE From the Photometer and Electron Energy Analyzer Experiments

Hecht, JH; Clemmons, JH; Slocum, PL; Strickland, D;

Published by:       Published on:

YEAR: 2003     DOI:

Atomic Oxygen Depletion Observations in a Diffuse Aurora

Patterson, P; Swenson, C; Melville, K; Christensen, AB; Clemmons, J;

Published by:       Published on:

YEAR: 2003     DOI:

Atomic Oxygen Depletion Measurements in a Diffuse Aurora

Patterson, P; Swenson, C; Melville, K; Stegman, J; Christensen, A; Clemmons, J;

Published by:       Published on:

YEAR: 2002     DOI: