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C/NOFS Remote Sensing of Ionospheric ReflectanceAlfvn waves play critical roles in the electrodynamic coupling of plasmas at magnetically conjugate regions in near-Earth space. Associated electric (E*) and magnetic (dec B*) field perturbations sampled by sensors on satellites in low-Earth orbits are generally super positions of incident and reflected waves. However, lack of knowledge about ionospheric reflection coefficients (alpha) hinders understanding of generator outputs and load absorption of Alfvn wave energies. Here we demonstrate a new method for estimating using satellite measurements of ambient E* and dec B* then apply it to a case in which the Communication Navigation Outage Forecasting System (CNOFS) satellite flew conjugate to the field of view of a 630.0 nm all-sky imager at El Leoncito, Argentina, while medium-scale traveling ionosphere disturbances were detected in its field of view. In regions of relatively large amplitudes of E* and B*,calculated values ranged between 0.67 and 0.88. This implies that due to impedance mismatches, the generator ionosphere puts out significantly more electromagnetic energy than the load can absorb. Our analysis also uncovered caveats concerning the methods range of applicability in regions of low E* and B*. The method can be validated in future satellite-based auroral studies where energetic particle precipitation fluxes can be used to make independent estimates of alpha.
Document ID
20170003085
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Burke, W. J. (Boston Coll. Boston, MA, United States)
Pfaff, Robert F. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Martinis, C. R. (Boston Coll. Boston, MA, United States)
Gentile, L. C. (Air Force Research Lab. Albuquerque, NM, United States)
Date Acquired
April 6, 2017
Publication Date
May 31, 2016
Publication Information
Publication: Journal of Geophysical Research: Space Physics
Volume: 121
Issue: 5
ISSN: 2169-9402
Subject Category
Geophysics
Earth Resources and Remote Sensing
Report/Patent Number
GSFC-E-DAA-TN41057
Distribution Limits
Public
Copyright
Other