Physics
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.2023g&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 2023-2035.
Physics
1
Scientific paper
Expected signal returns for a ground-based resonance Lidar system used for profiling metastable thermospheric helium are presented, scaleable to specific system configurations. The signal estimate is dependent on the calculation of the effective backscatter cross-section for the He 10830 Å resonant transition as well as an estimate of thermospheric metastable helium densities obtained from a recent model. The peak backscatter cross-section is found to be 2.7(+/- 0.3) × 10-16 m2 with an effective backscatter cross-section (assuming a 1 GHz rms laser linewidth centered at a wavelength of 10 830.32 Å) of 2.6(+/- 0.3) × 10-16 m2. Measurements using the metastable He 3188 Å and 3889Å lines are evaluated. Challenges in experimental design (i.e., laser characteristics, near infrared single photon detection, and background noise), as well as potential operation from a space-borne platform, are also discussed. With current technology, profiles with relatively high temporal and vertical resolution are shown to be attainable under twilight conditions.
Gerrard Andrew J.
Kane Timothy J.
Kerr Robert B.
Meisel David D.
Thayer Jeffrey P.
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