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Observations of Spatial Variations in O/N2 During an Auroral Substorm Using the Multichannel Downlooking Camera on the VISIONS Rocket.

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Title: Observations of Spatial Variations in O/N2 During an Auroral Substorm Using the Multichannel Downlooking Camera on the VISIONS Rocket.
Authors: Hecht, J. H.1 james.hecht@aero.org, Clemmons, J. H.1, Conde, M. G.2, Hampton, D. L.2, Michell, R. G.3,4, Rowland, D. E.3, Pfaff, R. F.3, Walterscheid, R. L.1
Source: Journal of Geophysical Research. Space Physics. Aug2018, Vol. 123 Issue 8, p7089-7105. 17p.
Subject Terms: Aurora spectra, Auroral substorms, Auroral photography
Geographic Terms: Kaktovik (Alaska), Yukon
Abstract: 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. Key Points: Wide field imaging of three auroral emissions are obtained from rocket observations at up to 750‐km altitudeWide field observations show a rapid decrease in O/N2 over a large area from Fort Yukon to KaktovikObservations of the vertical profile of O/N2 are consistent with presence of low‐energy electrons [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Observations of Spatial Variations in O/N<subscript>2</subscript> During an Auroral Substorm Using the Multichannel Downlooking Camera on the VISIONS Rocket.
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  Data: <searchLink fieldCode="DE" term="%22Kaktovik+%28Alaska%29%22">Kaktovik (Alaska)</searchLink><br /><searchLink fieldCode="DE" term="%22Yukon%22">Yukon</searchLink>
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  Data: 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. Key Points: Wide field imaging of three auroral emissions are obtained from rocket observations at up to 750‐km altitudeWide field observations show a rapid decrease in O/N2 over a large area from Fort Yukon to KaktovikObservations of the vertical profile of O/N2 are consistent with presence of low‐energy electrons [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1029/2018JA025288
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        Text: English
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      – SubjectFull: Aurora spectra
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      – SubjectFull: Auroral substorms
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      – SubjectFull: Auroral photography
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      – SubjectFull: Kaktovik (Alaska)
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              Text: Aug2018
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