High Latitude Oxygen LENA

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Presentation transcript:

High Latitude Oxygen LENA Gordon R Wilson Mission Research Corporation, Nashua NH Thomas E. Moore and Michael Collier Goddard Space Flight Center, Greenbelt MD

This is what we hoped to see.

This is what we saw.

LENA spin-time spectrogram for 24 August, 2000.

Integrated perigee pass signal intensities plotted (in arbitrary units) versus time along with magnetic activity as indicated by Ap.

Questions: Why is the perigee signal (one of the strongest seen by LENA) only visible near perigee? 2. Why does the perigee pass signal have such a broad distribution in spin angle? 3. Why does the overall intensity of the Perigee pass signal not always track magnetic activity?

Oxygen Orbits Orbits of oxygen atoms launched from 1000 km 11 9 7.5 6 4.5 3 Oxygen Orbits Orbits of oxygen atoms launched from 1000 km altitude and -65˚ magnetic latitude with the indicated energies (eV).

Perigee and transverse distance to perigee for oxygen atoms launched at 800 km altitude with the indicated Launch angle (with respect to horizontal) and energy.

Perigee and transverse distance to perigee for oxygen atoms launched at 1600 km altitude with the indicated Launch angle (with respect to horizontal) and energy.

Differential scattering cross sections for atomic oxygen on various gasses.

Conclusions: The perigee pass signal consists primarily of low energy (< 40 eV) oxygen atoms. 2. These atoms are energized in a low altitude region (< 2000 km), very likely only in the auroral zone. 3. There is a high energy (3 - 10 eV) component of thermospheric oxygen that consists of atoms trapped in orbits around the earth. 4. LENA emitted from the auroral zone can scatter out of the lower atmosphere in regions distant from their point of origin contributing to the diffuse appearance of the emissions.