ANGEO Annales Geophysicae ANGEO 1432-0576 Copernicus GmbH Göttingen, Germany 10.5194/angeo-26-3999-2008 First estimates of volume distribution of HF-pump enhanced emissions at 6300 and 5577 Å: a comparison between observations and theory Gustavsson B. 1 Kosch M. 2 Wong A. 3 Pedersen T. 5 Heinselman C. 4 Mutiso C. 6 Bristow B. 7 Hughes J. 6 Wang W. 3 Dept. of Physics and Technology, University of Tromsø, Tromsø, Norway Department of Communication Systems, Lancaster University, Lancaster, UK HIPAS Observatory, Two Rivers AK, USA Space Vehicles Directorate, Air Force Research Laboratory, Hanscom AFB, MA, USA SRI International, Menlo Park, CA, USA Physical Science Dept, Embry-Riddle Aeronautical Univ., FL, USA Geophysical Institute, University of Alaska, Fairbanks, AK, USA 08 12 2008 26 12 3999 4012 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.ann-geophys.net/26/3999/2008/angeo-26-3999-2008.html The full text article is available as a PDF file from http://www.ann-geophys.net/26/3999/2008/angeo-26-3999-2008.pdf

We present bi-static observations of radio-wave induced optical emissions at 6300 and 5577 Å from a night-time radio-induced optical emission ionospheric pumping experiment at the HIPAS (Fairbanks) facility in Alaska. The optical observations were made at HIPAS and from HAARP located 285 km south-east. From these observations the altitude distribution of the emissions is estimated with tomography-like methods. These estimates are compared with theoretical models. Other diagnostics used to support the theoretical calculations include the new Poker Flat AMISR UHF radar near HIPAS. We find that the altitude distribution of the emissions agree with electron transport modeling with a source of accelerated electrons located 20 km below the upper-hybrid altitude.

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