HR: 1340h
AN: SA33A-1130    [Abstracts]
TI: Multi-instrument Observations of the Development of the Equatorial Ionization Anomaly and Links to Scintillation
AU: * McDonald, S E
EM: sarah.mcdonald@nrl.navy.mil
AF: Naval Research Laboratory, Space Science Division, Washington, DC 20375 United States
AU: Basu, S
EM: sbasu@bu.edu
AF: Boston University, Center for Space Physics, Boston, MA 02215 United States
AU: Basu, S
EM: basu@ppd.nrl.navy.mil
AF: Air Force Research Laboratory, AFRL/VSBXI, Hanscom AFB, MA 01731 United States
AU: Groves, K
EM: keith.groves@hanscom.af.mil
AF: Air Force Research Laboratory, AFRL/VSBXI, Hanscom AFB, MA 01731 United States
AU: Scherliess, L
EM: ludger@gaim.cass.usu.edu
AF: Utah State University, Center for Atmospheric and Space Sciences, Logan, UT 84322 United States
AU: Thompson, D C
EM: thompson@cc.usu.edu
AF: Utah State University, Center for Atmospheric and Space Sciences, Logan, UT 84322 United States
AU: Schunk, R W
EM: schunk@cc.usu.edu
AF: Utah State University, Center for Atmospheric and Space Sciences, Logan, UT 84322 United States
AU: Sojka, J J
EM: fasojka@sojka.cass.usu.edu
AF: Utah State University, Center for Atmospheric and Space Sciences, Logan, UT 84322 United States
AU: Zhu, L
AF: Utah State University, Center for Atmospheric and Space Sciences, Logan, UT 84322 United States
AB: During the geomagnetically quiet month of March 2002, scintillations in the Pacific sector (Manila, Singapore and Guam) were observed on most nights. There are several nights, however, where scintillations were not observed at one or more of these locations. In this study we investigate the development of the Equatorial Ionization Anomaly (EIA) in the Pacific sector and relate the results back to the occurrence/non-occurrence of scintillations at these longitudes. Space-based and ground-based measurements of the electron densities are used in order to obtain an understanding of the large-scale structure of the low-latitude ionosphere during the early evening hours when the conditions for scintillations are set up. The study includes TEC measurements from TOPEX and GPS ground stations, in situ electron density measurements from the DMSP satellites, and electron densities derived from UV line-of-sight radiances from both TIMED-GUVI, and the LORAAS instrument aboard the ARGOS satellite. The Global Assimilation of Ionospheric Measurements (GAIM) model is used to assimilate these measurements into a global model of the ionosphere for the days of interest. The model provides estimates of the ionospheric specification and is used to fill in the gaps in longitude and time that are not covered by the measurement data. We present both measurement and model data for several days in March 2002 and discuss factors that may modulate the development of scintillation.
DE: 2415 Equatorial ionosphere
DE: 2437 Ionospheric dynamics
DE: 2439 Ionospheric irregularities
DE: 2447 Modeling and forecasting
SC: SPA-Aeronomy [SA]
MN: 2004 AGU Fall Meeting