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Transient Ionospheric Upflow Driven by Poleward Moving Auroral forms Observed During the Rocket Experiment for Neutral Upwelling 2 (RENU2) Campaign
Author(s) -
Burleigh M.,
Zettergren M.,
Lynch K.,
Lessard M.,
Moen J.,
Clausen L.,
Kenward D.,
Hysell D.,
Liemohn M.
Publication year - 2019
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2018gl081886
Subject(s) - ionosphere , sounding rocket , atmospheric sciences , forcing (mathematics) , rocket (weapon) , upwelling , geophysics , precipitation , environmental science , ion , electron precipitation , brightness , depth sounding , physics , geology , climatology , meteorology , magnetosphere , plasma , astronomy , geography , oceanography , archaeology , quantum mechanics
Abstract This study examines cumulative effects of a series of poleward moving auroral forms on ion upflow and downflow. These effects are investigated using an ionospheric model with inputs derived from the Rocket Experiment for Neutral Upwelling 2 (RENU2) sounding rocket campaign. Auroral precipitation inputs are constrained by all‐sky imager brightness values resulting in significant latitudinal structuring in simulated ionospheric upflows due to transient forcing. For contrast, a case with steady forcing generates almost double the O + upflow transport through 1,000 km when compared to poleward moving auroral form‐like structures. At high altitudes, model results show a spread in upflow response time dependent on ion mass, with molecular ions responding slower than atomic ions by several minutes. While the modeled auroral precipitation is not strong enough to accelerate ions to escape velocities, source populations available for higher‐altitude energization processes are greatly impacted by variable forcing exhibited by the RENU2 event.