Upper-thermospheric and exospheric ions, neutrals and the processes that excite them.

Conveners: Phil Erickson, Sixto Gonzalez, John Noto
Monday, June 14, 03:25-05:30 PM
Engineering Center

The workshop focuses on recent ISR and optical observations of neutrals and ions in the upper thermosphere, exosphere, and topside ionosphere, especially as they pertain to:

1. the dynamics and photo-chemistry that create them and account for their altitude distribution;
2. the processes that excite the O, H, and He emissions;
3. the processes that account for variability in their distribution.

Recent ion measurements in the topside ionosphere at Arecibo, Millstone Hill, and Jicamarca are discussed, as are recent measurements of neutral O, H, and He at Arecibo and Millstone Hill. Plans for new nested experimentation at Millstone Hill and Arecibo within the context of both upcoming solar maximum conditions and instrumental constraints are discussed. Plans for chain experiments including integration of new capabilities and possible new optical sites along the chain (including Clemson Univ. and the NOAO Cerro Tololo inter american obsevatory near la serena, in Chile) are also presented.

The session begins with a discussion of our current understanding of OI 844.6 nm, 1128.6 nm, and He 1083.0 nm excitation mechanisms, and features a comparison of current photoelectron modeling capabilities. Advances in topside ionospheric modeling at Arecibo will be highlighted. Seven speakers are scheduled to present data, modeling results, and a brief review of capabilities. All others wishing to make short presentations pertaining to neutral excitation in the upper thermosphere and exosphere, ionospheric composition and transport, or facility capabilities are welcome.