2009 Workshop:Arecibo Friends
From CedarWiki
Arecibo Friends
Anasazi South, 1230-1430 (Part 1) and 1500-1700 (Part 2), 02 July 2009
Conveners
Workshop Categories
Altitudes: IT - Latitudes: mid-latitude - Inst/Model: radar - Other: all altitudes and most instruments
Format of the Workshop
- Informational update
- Panel discussion
- brief highlights from our users
Estimated attendance
45
Special technology requests
none
Description
As opposed to previous years I intend to briefly present the highlights for the last year, plans for the near future and then after briefly describing the latest news the Arecibo budget recompetition situation, have a panel discussion to brainstorm and list alternatives for the future of atmospherics science at Arecibo/NAIC.
The preliminary agenda looks like this:
Arecibo Friends Draft Agenda 6/5/09 4:41 PM
Arecibo Friends session 1
- 25 minutes state of the observatory, SAS program highlights, NAIC news and recompetition (sixto/Mike Sulzer will speak)
- 35 min. HF facility and new 430 hardware improvements and techniques M. Sulzer
- 45 minutes roundtable/panel discussion and dialogue about the Arecibo budget situation and NAIC recompetition (Rich Behnke will speak at the beginning)
- (0) 15 minutes John Mathews PSU
Break
Arecibo Friends session 2 - Highlights by our users, maybe 10 minutes or so each , so far I have commitments from the following:
- (1) Eliana Nossa, Cornell University et al,
Sporadic E layer observations over Arecibo; Searching for the source of QP echoes. A 30 MHz imaging radar located on St. Croix detected intense, structured coherent backscatter from postsunset sporadic E layers over Arecibo during the fall of 2008. Neutral wind shears near the layers are thought to be able to trigger the so-called QP echoes through the action of neutral Kelvin- Helmholtz (KH) instability (Larsen, 2002). The talk investigates this hypothesis by evaluating the Richardson number criterion in the MLT region using temperature and velocity profiles derived form Arecibo observations made concurrently. We find that the criterion was satisfied frequently and also that the observed wind direction pattern was consistent with the idea of neutral overturning leading to sporadic E layer structuring.
- (2) F. T. Djuth (GRI), L. D. Zhang, S. M. Smith, D. J. Livneh, I. Seker, M. P., Sulzer, J. D. Mathews, R. L. Walterscheid,
Arecibo’s Thermospheric Gravity Waves and the Case for an Ocean Source Wave-like disturbances in electron density have been observed in the thermosphere above Arecibo Observatory, Puerto Rico throughout its 45-year history. However, only recently has it become evident that these waves are continuously present in the Arecibo thermosphere. The wave characteristics are fairly constant between day and night and from seas on to season. Highresolution electron density measurements obtained by applying the coded long pulse radar technique to photoelectron-enhanced Langmuir waves are presented. These new observations strongly suggest that the perturbations in electron density are the result of internal acoustic gravity waves (AGWs) propagating through the Arecibo thermosphere. Most of the wave energy is at periods greater than the Brunt-Väisälä period, and the change in vertical wavelength with altitude is consistent with theoretical expectations for waves that are damped by viscosity/thermal conduction. The AGW source appears to produce AGWs that are broad banded in wavenumber space. The downward phase trajectories of the electron density perturbations between 400 km and 120 km combined with the horizontal phase velocities obtained from airglow measurements support the idea that the AGWs are not ducted but rather are locally produced. In addition, the altitudes at which major peaks in electron density fluctuations are observed follow theoretical estimates for non-ducted waves. The nominal period of the AGW wave packet is ~60 min at 250 km altitude, but periods of ~20 min are also evident at lower altitudes. Classic sources of AGWs do not appear to be consistent with the observations. Ray tracing of the AGWs combined with 630.0- nm airglow observations point to a source location in the Atlantic Ocean that is ~570 km east-northeast of Arecibo.
- (3) Diana Prado (UPR-Mayaguez/AO et al. ,
Magnetic storm effects on the topside composition during solar minimum
- (4) Pedrina Terra (Arecibo) and Noto, Kerr et al. ,
7320 O+ and H_alpha FPI observations at Arecibo
- (5) Christiano Brum (Arecibo) et al ,
Oxygen densities derived from Arecibo ISR (or MSIS vs. Burnsider Factor and alternative hypothesis for the O-O+ cross section adjustment)
- (6) Lars Dyrud (CRS) et al.,
Modeling sporadic E irregularities (with Julio) and GPS-TEC projects (with Nestor)
- (7) Wes Swartz (Cornell), Nestor et al
E- and F-region coupling between an intense sporadic E layer and a mesoscale traveling ionospheric disturbance
- (8) Jonathan Fentzke (U CO) et al.
Arecibo student in residence
- (9) Diego Janches (CoRA/NWRA) et al.,
Micrometeor differential ablation
- (10) Jonathan Friedman (AO) et al.,
Daytime K Doppler lidar progress
Workshop Summary
This is where the final summary workshop report will be.
Presentation Resources
Upload presentation and link to it here. Links to other resources.
- Add links to your presentations here, including agendas, that are uploaded above. Please add bullets to separate talks. See further information on how to upload a file and link to it.
