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Lidar observations of the MLT metal layer and temperatures at (and with) the Arecibo Observatory

Lidar observations of the MLT metal layer and temperatures at (and with) the Arecibo Observatory. Jonathan Friedman Arecibo Observatory 17 May 2007. Outline. Arecibo’s lidars Results Ion-neutral interactions … sporadic layers Micrometeors and the metal layer topside

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Lidar observations of the MLT metal layer and temperatures at (and with) the Arecibo Observatory

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  1. Lidar observations of the MLT metal layer and temperatures at (and with) the Arecibo Observatory Jonathan Friedman Arecibo Observatory 17 May 2007

  2. Outline • Arecibo’s lidars • Results • Ion-neutral interactions … sporadic layers • Micrometeors and the metal layer topside • MLT temperature measurements & solar influence

  3. Arecibo Observatory Lidars • Two broadband resonance density lidars (any 2 of Na, Ca, Ca+, Fe) • Narrowband K Doppler lidar • Four 80-cm diameter cassegrain telescopes, fiber coupled to detectors. • Seven independent channels with PMT detectors, APD channels under development. • Daylight capability for K lidar being implemented

  4. K lidar Transmitter & Receiver

  5. Some Results • Summary of some past results • Sporadic layers • Temperatures, inversion layers, and Gravity Wave events • Ongoing projects • Metal layer topside and micrometeoroids • Seasonal thermal structure of the Arecibo mesopause.

  6. Sporadic layer event during the 1998 Coquí II sounding rocket campaign

  7. Tepley et al., 2003 Ca+ e- K

  8. Ducted waves and temperature inversions

  9. Arecibo and SABER inversion measurement

  10. The Metal Layer Topside: A direct measure of micrometeor input?

  11. Metal Layer Topside 0.1/cc 1/cc 10/cc 100/cc

  12. Metal abundance ratios

  13. An example from Kühlungsborn (1/2) Plotted are ratios of metal atom densities (K/Fe), K/Ca, and Fe/Ca from Kühlungsborn, 27 Oct 97.

  14. Example from Kühlungsborn (2/2)

  15. [K/Na] example for Arecibo

  16. Comparisons with K

  17. Seasonal Climatology of the tropical MLT

  18. Seasonal Climatology and how the mesopause above Arecibo fits into the global picture

  19. Latitude Comparison 78°N, Spitsbergen Höffner, 2006 35°N, Albuquerque, NM (Starfire) Chu et al., 2005 21°N, Maui, HI Friedman and Chu, 2006 18°N, Arecibo, PR Friedman and Chu, 2007

  20. Comparing specific altitudes

  21. 12-tidal oscillationsa work in progress

  22. January 12-h Analysis

  23. Including the 24-h tide from GSWM

  24. Summary • Arecibo has multiple resonance lidars to investigate the properties of the mesospheric metal layer • The K lidar is a Doppler lidar for temperature measurements. • We have studied sporadic layers in conjunction with the ionospheric radar. • We work together with visiting instruments to study transient phenomena. • We participate in the study of the meteoric input to the atmosphere, and how micrometeoroids may produce the topside. • We study thermal structure & oscillations • Full daylight capabilities imminent.

  25. Additional slides

  26. Tracking Ks layers

  27. Tracking ion layers

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