HR: 10:55h
AN: SA22A-03    [Abstracts]
TI: Multi-Platform Ground-Based Observations of Meso-Scale Waves and Spread F at Midlatitudes
AU: * Earle, G
EM: earle@utdallas.edu
AF: University of Texas at Dallas, 2601 N. Floyd Road, Richardson, TX 75083, United States
AU: Bullett, T
EM: Terry.Bullett@noaa.gov
AF: Air Force Research Laboratory, 325 Broadway E/GC2, Boulder, CO 80305, United States
AU: Groves, K
EM: Keith.Groves@hanscom.af.mil
AF: Air Force Research Laboratory, 325 Broadway E/GC2, Boulder, CO 80305, United States
AU: Bishop, R
EM: Rebecca.L.Bishop@aero.org
AF: Aerospace Corporation, POB 92957, Los Angeles, CA 90009, United States
AU: Crowley, G
EM: gcrowley@astraspace.net
AF: Astra-Space Corporation, 12703 Spectrum Drive, San Antonio, TX 78249, United States
AU: Bust, G
EM: gbust@astraspace.net
AF: Astra-Space Corporation, 12703 Spectrum Drive, San Antonio, TX 78249, United States
AU: Tolman, B
EM: btolman@arlut.utexas.edu
AF: University of Texas, ARL, Austin, TX 78758, United States
AU: Calfas, R
EM: rcalfas@arlut.utexas.edu
AF: University of Texas, ARL, Austin, TX 78758, United States
AU: Garner, T
EM: tgarner@arlut.utexas.edu
AF: University of Texas, ARL, Austin, TX 78758, United States
AU: Munton, D
EM: dmunton@arlut.utexas.edu
AF: University of Texas, ARL, Austin, TX 78758, United States
AB: Three distinctly different midlatitude spread F events were observed on separate nights during a two week period in the fall of 2006. One of the events occurred after a period of increased activity in several high latitude geomagnetic storm indices, another occurred during an extended period of magnetically quiescent conditions, and the third occurred during a moderately active period. The ionospheric and thermospheric conditions during these events were simultaneously monitored by a suite of ground-based instruments, including the Wallops Island Digisonde, a tri-static radar sensitive to traveling ionospheric disturbances (TIDs), scintillation detectors, and a network of ground-based GPS receivers. We present data from each of these systems, and contrast the observations on each night in order to investigate the ionospheric morphologies associated with each type of spreading event. Evidence of TIDs and plasma density variations are evident during the quiet-time event, while the geomagnetically active event shows a more impulsive density perturbation in the TEC data. Smaller scale turbulence and associated scintillations are evident only in two of the three cases. Plausible scenarios to explain the disparate observations will be discussed in light of these new data.
DE: 2435 Ionospheric disturbances
DE: 2443 Midlatitude ionosphere
DE: 2772 Plasma waves and instabilities (2471)
SC: SPA-Aeronomy [SA]
MN: 2007 Joint Assembly