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Found 6 entries in the Bibliography.

Showing entries from 1 through 6

2021

Development of a NIR camera for the BALBOA mission

More than 500 years ago, when Vasco Núñez de Balboa traveled to the New World, he must not have realized that his legacy would not only be cast in currency, but branded for space

Zhou, Xiaoyan; Rafol, Don; Michell, Robert; Hampton, Don; Geach, Christopher;

Published by: 43rd COSPAR Scientific Assembly. Held 28 January-4 February Published on:

YEAR: 2021 DOI:

2018

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

A Comparative Study of Spectral Auroral Intensity Predictions From Multiple Electron Transport Models

It is important to routinely examine and update models used to predict auroral emissions resulting from precipitating electrons in Earth\textquoterights magnetotail. These models are commonly used to invert spectral auroral ground-based images to infer characteristics about incident electron populations when in situ measurements are unavailable. In this work, we examine and compare auroral emission intensities predicted by three commonly used electron transport models using varying electron population characteristics. We then compare model predictions to same-volume in situ electron measurements and ground-based imaging to qualitatively examine modeling prediction error. Initial comparisons showed differences in predictions by the GLobal airglOW (GLOW) model and the other transport models examined. Chemical reaction rates and radiative rates in GLOW were updated using recent publications, and predictions showed better agreement with the other models and the same-volume data, stressing that these rates are important to consider when modeling auroral processes. Predictions by each model exhibit similar behavior for varying atmospheric constants, energies, and energy fluxes. Same-volume electron data and images are highly correlated with predictions by each model, showing that these models can be used to accurately derive electron characteristics and ionospheric parameters based solely on multispectral optical imaging data.

Grubbs, Guy; Michell, Robert; Samara, Marilia; Hampton, Donald; Hecht, James; Solomon, Stanley; Jahn, Jörg-Micha;

Published by: Journal of Geophysical Research: Space Physics Published on: 01/2018

YEAR: 2018 DOI: 10.1002/2017JA025026

Scientific Ballooning for Imaging Earth's Aurora under the Sun

Zhou, Xiaoyan; Rafol, SB; Hampton, Donald; He, Yutao; Lummerzheim, Dirk; Michell, Robert;

Published by: Published on:

YEAR: 2018 DOI:

2016

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: