A Multi-Year (2002-2006) Climatology of O/N2 in the Lower Thermosphere from TIMED GUVI and Ground-Based Photometer Data

Details A Multi-Year (2002-2006) Climatology of O/N2 in the Lower Thermosphere from TIMED GUVI and Ground-Based Photometer Data A Multi-Year (2002-2006) Climatology of O/N2 in the Lower Thermosphere from TIMED GUVI and Ground-Based Photometer Data

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa21b..03h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA21B-03

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry

Scientific paper

The Mass Spectrometer and Incoherent Scatter (MSIS) series of models has long been a standard for specification and prediction of conditions in Earth’s thermosphere above 100 km. One aspect of the model that has not been well validated is its predictions of the thermospheric composition response to varying solar and geomagnetic forcing. Here we compare the predictions by NRLMSIS00 for column O/N2 with observations at a fixed longitude, chosen here as the approximate meridian of the Poker Flat Research Range in central Alaska. MSIS predictions and TIMED GUVI (daytime) data are both averaged over 5 by 5 degree regions, and compared at -147.4 W longitude for 6 latitudes (15, 25, 35, 45, 55, and 65 degrees N). The GUVI O/N2 data analysis has all been reprocessed using the latest CPI software. Comparisons are made for days 1 to 100, 120 to 220, and 240 to 340 for the years 2002 to 2006. Comparisons are also made with nightside auroral O/N2 data obtained from two photometers located at Poker Flat and Fort Yukon AK (both near 65 N). We find that there is often remarkable agreement for the GUVI and MSIS results at high latitudes. However, there are also times, during large storms where there is some disagreement. Surprisingly, the greatest differences appear to occur at mid-latitudes, presumably because MSIS cannot account for dynamic events originating in the auroral zone and propagating southward. While on average the nighttime data show considerable agreement with MSIS they are much more variable than predicted by the model. These results suggest significant local effects not captured by the MSIS model.

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