LOWALTITUDE ENA EMISSIONS FROM THICK ATMOSPHERES - PowerPoint PPT Presentation
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LOWALTITUDE ENA EMISSIONS FROM THICK ATMOSPHERES
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Ions impeding on the upper atmosphere hits a 'wall' of neutral oxygen and ... emissions' that are 3 orders of magnitude greater than the high-altitude ENAs. ... – PowerPoint PPT presentation
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Title: LOWALTITUDE ENA EMISSIONS FROM THICK ATMOSPHERES
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LOW-ALTITUDE ENA EMISSIONS FROM THICK
ATMOSPHERES
- E. C. Roelof, P. Cson Brandt, D. G. Mitchell
- JHU/APL
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LOW ALTITUDE EMISSIONS
- Ions impeding on the upper atmosphere hits a
wall of neutral oxygen and produces
low-altitude ENA emissions that are 3 orders of
magnitude greater than the high-altitude ENAs. - In a first approximation, ions in the loss-cone
will be completely lost to the atmosphere. ? ENAs
only in the 90 deg direction. - HENA sees evidence that ENAs are emitted at
p.a.ltlt90 deg (upward). - Why?
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LOW ALTITUDE EMISSIONSNew developments
- Galand Richmond 1999 showed that an ENA
mirrors in a converging B-field. - On top of that we have energy loss.
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