Statistics
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsa43a1095w&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SA43A-1095
Statistics
0310 Airglow And Aurora, 0350 Pressure, Density, And Temperature, 3359 Radiative Processes, 3389 Tides And Planetary Waves
Scientific paper
Two of the 10 radiometers on the SABER instrument aboard the TIMED spacecraft measure the limb profiles from the OH Meinel first-overtone bands at 2.0 μm (OH-A) and at 1.6 μm (OH-B). The OH-A band originates from high-lying vibrational states (v=8-9) of the OH ground electronic state, while the OH-B band originates from low-lying vibrational states (v=3-5). These provide limb radiance profiles continuously over a latitude range 53S-82N or 82N-53S, depending upon the phase of the yaw cycle. We have examined important characteristics of the volume emission rate (VER) profiles of these bands that have been obtained by inverting the radiance profiles. In particular, we characterize the global occurrence probabilities of the heights of both layers as a function of latitude, local time and season and note any differences in behavior between the two bands. Although the OH layer is often considered to be a fixed profile with a narrow peak near 87 km, a significant number of the profiles show distinctly different behavior. Melo et al. (JGR, 2000) reported that double-peaked layers were found in UARS/WINDI data 5-25% of the time. SABER also sees double layers at least 10% of the time and observes the peak VER at times below 80 km, altitudes not observed in the WINDI data. We will examine the occurrence statistics of these features and look for correlations with large tidal amplitudes and temperature inversions that are simultaneously measured by SABER. These correlations may hold clues to what dynamical processes could produce such double peaks and anomalously low-altitude peaks.
Baker Daniel
Gordley Larry L.,
Mylnczak M. G.
Picard Richard H.
Russell James M.
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