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Proposal Identification No.:

T2378

Date Received:

2007-Oct-1 10:22:42

Technical Page
Proposal Type: General Category: Observation Category: Total Time Requested: Minimum Useful Time: Prop osal Title: ABSTRACT: Regular Terrestrial Aeronomy Exosphere 120 Hours 4 hours

Investigating The Thermospheric Hot Oxygen Controversy

The thermal balance of the upper thermosphere, topside F region, and lower exosphere is investigated using nested diagnostics that have been developed over the past decade. This effort reconciles a controversy concerning the presence, or absence, of a hot oxygen corona in the region, and determines if the large HeII population detected (and published) in Arecibo Observatory ISR data may in fact be a misinterpreted hot OII population above the F2 peak. New diasgnostics include isolation of the OII 732 nm airglow emission line profile, isolated from OH contamination using a Fabry Perot Interferometer with sensitivy enhanced 40 fold over previous efforts. The neutral temperature near 500 km is also determined from the 1083 nm metastable helium emission line profile, using a new infrared array detector. In combination with the usual topside ISR measurements of light ion composition and temperature, and the common F2 region 630 nm airglow temperature, this experiment will isolate any population of nonthermalized hot oxygen, that may exist in the upper thermosphere and exospherre.

Name Sixto Gonzalez

Institution Arecibo Observatory

E-mail sixto@naic.edu

Phone 787-878-2612 ext. 252

Student no

Remote Observing Request

X

Observer will travel to AO Remote Observing In Absentia (instructions to operator)

Instrument Setup
430 CH radar Atmospheric Observation Instruments: Tilt-Photometer Spectrophotometer Fabry-Perot Ionosonde

Description of Observer Equipment: IR Fabry-Perot 1


Sp ecial Equipment or setup:

none

RFI Considerations Frequency Ranges Planned

2