lidar observations of the mlt metal layer and temperatures at (and with) the arecibo observatory
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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17 May 2007
Lidar observations of the MLT metal layer and temperatures at
(and with) the Arecibo Observatory
Jonathan FriedmanArecibo Observatory
17 May 2007
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17 May 2007
Outline
• Arecibo’s lidars• Results
– Ion-neutral interactions … sporadic layers
– Micrometeors and the metal layer topside
– MLT temperature measurements & solar influence
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17 May 2007
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
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17 May 2007
K lidar Transmitter & Receiver
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17 May 2007
Some Results
1. Summary of some past results• Sporadic layers• Temperatures, inversion layers, and Gravity
Wave events2. Ongoing projects
• Metal layer topside and micrometeoroids• Seasonal thermal structure of the Arecibo
mesopause.
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17 May 2007
Sporadic layer event during the 1998 Coquí II sounding
rocket campaign
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17 May 2007
Tepley et al., 2003
Ca+
e-
K
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17 May 2007
Ducted waves and temperature inversions
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17 May 2007
Arecibo and SABER inversion measurement
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17 May 2007
The Metal Layer Topside: A direct
measure of micrometeor input?
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17 May 2007
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Metal Layer Topside
0.1/cc
100/cc10/cc
1/cc
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17 May 2007
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Metal abundance ratios
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17 May 2007
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.
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17 May 2007
Example from Kühlungsborn (2/2)
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17 May 2007
[K/Na] example for Arecibo
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17 May 2007
Comparisons with K
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17 May 2007
Seasonal Climatology of the tropical MLT
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17 May 2007
Seasonal Climatology and how the mesopause above Arecibo fits into the
global picture
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17 May 2007
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78°N, SpitsbergenHöffner, 2006
Latitude Comparison
35°N, Albuquerque, NM (Starfire)Chu et al., 2005
18°N, Arecibo, PRFriedman and Chu, 2007
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21°N, Maui, HIFriedman and Chu, 2006
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17 May 2007
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Comparing specific altitudes
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17 May 2007
12-tidal oscillationsa work in progress
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17 May 2007
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January 12-h Analysis
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17 May 2007
Including the 24-h tide from GSWM
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17 May 2007
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.
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17 May 2007
Additional slides
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17 May 2007
Tracking Ks layers
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17 May 2007
Tracking ion layers