Observations of N2 in the Lower Thermosphere by the RAIDS Experiment

Details Observations of N2 in the Lower Thermosphere by the RAIDS Experiment Observations of N2 in the Lower Thermosphere by the RAIDS Experiment

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa43a1749b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA43A-1749

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[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry

Scientific paper

Utilizing the RAIDS Extreme Ultraviolet Spectrograph (EUVS) on the ISS we present measurements of thermospheric N2 in the altitude range of 100-300km. One of the dominant features present in the EUVS observing wavelength range 770 - 1100 Å is N II (1085 Å). N2 emissions in the atmosphere primarily results from hν + N2 → N2+(H + H’) → 1085 Å [Meier et al., 1991] with significant contributions to the emission below 150 km by e- + N2 [Bishop and Feldman, 2003]. Previous experiments have noted that the N2 emission rapidly increases between ~130 to ~200 km where it reaches a nearly constant emission intensity [Bishop and Feldman, 2003]. Other results from the Air Force STP 78-1 satellite showed an increase in N2 intensities between + 20 latitude during [Chakarabarti et al., 1983]. This talk presents observations of N2 observed by the RAIDS instrument throughout the last year. We show the variability as a function of altitude, and latitude/longitude and compare the results with earlier observations. Additionally, by determining the scale height of N2 we will calculate an exospheric temperature profile up 300 km. References: Bishop, J., P. D. Feldman, Analysis of the Astro-1/Hopkins Ultraviolet Telescop EUV-FUV dayside nadir spectral radiance measurements, J. Geophys. Res., 108(A6), doi:10.1029/2001JA000330, 2003. Chakrabarti, S., F. Paresce, S. Bowyer, R. Kimble, The Extreme Ultraviolet Day Airglow, J. Geophys. Res., 88(A6), 4898-4904, 1983. Meier, R. R., J. A. R. Samson, Y. Chung, E.-M. Lee, and Z.-X. He, Production of N+* from N2+ hv: Effective EUV emission yields from laboratory and dayglow data, Planet. Space Sci., 39, 1197-1207, 1991.

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