Energetic neutral atom imaging with the Polar CEPPAD/IPS instrument: Initial forward modeling results

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Although the primary function of the CEP-PAD/IPS instrument on Polar is the measurement of energetic ions in-situ, it has also proven to be a very capable Energetic neutral Atom (ENA) imager. Raw ENA images are currently being constructed on a routine basis with a temporal resolution of minutes during both active and quiet times. However, while analyses of these images by themselves provide much information on the spatial distribution and dynamics of the energetic ion population in the ring current, detailed modeling is required to extract the actual ion distributions. In this paper, the authors present the initial results of ... continued below

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8 p.

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Henderson, M.G.; Reeves, G.D.; Moore, K.R.; Spence, H.E.; Jorgensen, A.M.; Fennell, J.F. et al. December 31, 1997.

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Although the primary function of the CEP-PAD/IPS instrument on Polar is the measurement of energetic ions in-situ, it has also proven to be a very capable Energetic neutral Atom (ENA) imager. Raw ENA images are currently being constructed on a routine basis with a temporal resolution of minutes during both active and quiet times. However, while analyses of these images by themselves provide much information on the spatial distribution and dynamics of the energetic ion population in the ring current, detailed modeling is required to extract the actual ion distributions. In this paper, the authors present the initial results of forward modeling an IPS ENA image obtained during a small geo-magnetic storm on June 9, 1997. The equatorial ion distribution inferred with this technique reproduces the expected large noon/midnight and dawn/dusk asymmetries. The limitations of the model are discussed and a number of modifications to the basic forward modeling technique are proposed which should significantly improve its performance in future studies.

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8 p.

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INIS; OSTI as DE99000750

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  • Paros ISTP symposium, Paros (Greece), Jul 1997

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  • Other: DE99000750
  • Report No.: LA-UR--98-2147
  • Report No.: CONF-9707186--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 296779
  • Archival Resource Key: ark:/67531/metadc674446

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  • December 31, 1997

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 25, 2016, 4:18 p.m.

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Henderson, M.G.; Reeves, G.D.; Moore, K.R.; Spence, H.E.; Jorgensen, A.M.; Fennell, J.F. et al. Energetic neutral atom imaging with the Polar CEPPAD/IPS instrument: Initial forward modeling results, article, December 31, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc674446/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.