The Morphology of the Post-Sunset Equatorial Anomaly: A Preliminary Assessment of Early Observations with the TIMED/GUVI Sensor

Details The Morphology of the Post-Sunset Equatorial Anomaly: A Preliminary Assessment of Early Observations with the TIMED/GUVI Sensor The Morphology of the Post-Sunset Equatorial Anomaly: A Preliminary Assessment of Early Observations with the TIMED/GUVI Sensor

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa51a..10s&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SA51A-10

Mathematics

Logic

2494 Instruments And Techniques, 0310 Airglow And Aurora, 2415 Equatorial Ionosphere

Scientific paper

The Global Ultraviolet Imager (GUVI) on the TIMED spacecraft makes measurements of several "colors" in the far ultraviolet portion of the spectrum. One of the GUVI colors is the 135.6 nm atomic oxygen emission feature. On the nightside of the Earth, this emission is generated by radiative recombination of oxygen ions and electrons, providing a radiance approximately proportional to the line-of-sight integral of the square of the electron density. The GUVI instrument has a scan mirror that enables to it to obtain images of 135.6 nm radiance both across the surface of the Earth, and up on to one of the Earth's limbs. GUVI 135.6 observations therefore provide information on both the horizontal and vertical structure of the post-sunset equatorial ionosphere. During the mid-January to mid-February 2002 time frame, the descending node of the TIMED spacecraft was between 2000-2400 LT, enabling this type of measurement. The morphology of equatorial anomaly observed during this time period will be discussed together with a preliminary comparison of the observations to simulated radiances derived from a climatological model.

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