Composition Change in the Lower Thermosphere Over Alaska from TIMED/CEDAR Ground-Based and GUVI Observations

Details Composition Change in the Lower Thermosphere Over Alaska from TIMED/CEDAR Ground-Based and GUVI Observations Composition Change in the Lower Thermosphere Over Alaska from TIMED/CEDAR Ground-Based and GUVI Observations

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa62b0409h&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA62B-0409

Physics

0310 Airglow And Aurora

Scientific paper

From January to April 2002 two four-channel photometer systems were operated at Poker Flat and Fort Yukon, Alaska. Each system measured, from dusk to dawn every night, a set of auroral emissions (N2+(4278), OI(6300), N2(8714) and OI(8446)) approximately every 10 seconds. From these data the auroral electron flux, average energy of precipatating particles and and changes in the thermospheric [O]/[N2] ratio were derived. The latter is characterized by an atomic oxygen scale factor whose value is near 1 for an undisturbed atmosphere. When the atmosphere is peturbed by auroral heating the scale factor often drops to values below 0.5. Because two N2 emissions are measured data can be analyzed even in the presence of thin clouds. Here we present the results for all nights during this period when good aurora were present. On some nights the O scale factor drops after auroral precipatation begins. Recovery of the O scale factor to pre-auroral levels often occurs by the next night. However sometimes, such as during the period of the large late-April storm, the scale factor is low for several nights in a row. We make comparisons with the [O]/[N2] densities derived from the TIMED GUVI data on selected nights. The emphasis for this comparison is during March and April when GUVI obtained data over Alaska during the night.

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