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Current Closure in the Auroral Ionosphere: Results from the Auroral Current and Electrodynamics Structure Rocket MissionThe Auroral Current and Electrodynamics Structure (ACES) mission consisted of two sounding rockets launched nearly simultaneously from Poker Flat Research Range, AK on January 29, 2009 into a dynamic multiple-arc aurora. The ACES rocket mission was designed to observe electrodynamic and plasma parameters above and within the current closure region of the auroral ionosphere. Two well instrumented payloads were flown along very similar magnetic field footprints, at different altitudes, with small temporal separation between both payloads. The higher altitude payload (apogee 360 km), obtained in-situ measurements of electrodynamic and plasma parameters above the current closure region to determine the input signature. The low altitude payload (apogee 130 km), made similar observations within the current closure region. Results are presented comparing observations of the electric fields, magnetic components, and the differential electron energy flux at magnetic footpoints common to both payloads. In situ data is compared to the ground based all-sky imager data, which presents the evolution of the auroral event as the payloads traversed through magnetically similar regions. Current measurements derived from the magnetometers on the high altitude payload observed upward and downward field-aligned currents. The effect of collisions with the neutral atmosphere is investigated to determine it is a significant mechanism to explain discrepancies in the low energy electron flux. The high altitude payload also observed time-dispersed arrivals in the electron flux and perturbations in the electric and magnetic field components, which are indicative of Alfven waves.
Document ID
20120009505
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Kaeppler, S. R. (Iowa Univ. Iowa City, IA, United States)
Kletzing, C. A. (Iowa Univ. Iowa City, IA, United States)
Bounds, S. R. (Iowa Univ. Iowa City, IA, United States)
Gjerloev, J. W. (Bergen Univ. Norway)
Anderson, B. J. (Johns Hopkins Univ. Baltimore, MD, United States)
Korth, H. (Johns Hopkins Univ. Baltimore, MD, United States)
LaBelle, J. W. (Dartmouth Coll. Hanover, NH, United States)
Dombrowski, M. P. (Dartmouth Coll. Hanover, NH, United States)
Lessard, M. (New Hampshire Univ. Dover, NH, United States)
Pfaff, R. F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Rowland, D. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jones, S. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Heinselman, C. J. (SRI International Corp. Menlo Park, CA, United States)
Date Acquired
August 25, 2013
Publication Date
October 31, 2011
Subject Category
Astronomy
Report/Patent Number
GSFC.JA.6158.2012
Distribution Limits
Public
Copyright
Public Use Permitted.

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