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Browsing Monografías by Author "Hysell, D. L."
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Item Restricted Aperture synthesis radar imaging for upper atmospheric research(IntechOpen, 2012-04) Hysell, D. L.; Chau Chong Shing, Jorge LuisRadars used for upper-atmospheric applications can be engineered to measure the Doppler spectra of their targets adequately for most intents and purposes, the spectral resolution being limited only by the observing time and the constraints of stationarity. Likewise, they can measure the range to their targets adequately for most intents and purposes, range resolution being limited by system bandwidth, the power budget, and the constraints of stationarity. Problems arise for “overspread” targets, where range and frequency aliasing cannot simultaneously be avoided using pulse-to-pulse methodologies, and more complicated pulse-to-lag or aperiodic pulsing methods are required (see for example (Farley, 1972; Huuskonen et al., 1996; Lehtinen, 1986; Sulzer, 1986; Uppala, 1993)). Important examples of this situation include incoherent scatter experiments (Farley, 1969), observations of meteor head echoes (Chau & Woodman, 2004), and observations of plasma density irregularities present in certain rapid flows, as are found in the equatorial ionosphere during so-called “equatorial spread F” (Woodman, 2009; Woodman & La Hoz, 1976).Item Restricted Ionospheric Irregularities: Frontiers(American Geophysical Union, 2014-03-14) Hysell, D. L.; Aveiro, H. C.; Chau Chong Shing, Jorge LuisThere are several thermosphere ionosphere models with bottom boundaries somewhere in the middle atmosphere. Achieving a true whole atmosphere modeling capability requires the specification of atmospheric conditions at a boundary. This chapter discusses the use of the Navy Operational Global Atmospheric Prediction System‐Advanced Level Physics High Altitude (NOGAPS‐ALPHA) model as a bottom boundary for the thermosphere ionosphere electrodynamics general circulation model (TIEGCM). The results are compared with Sounding of the Atmosphere with Broadband Emission Radiometry (SABER) observations and previously published model results. The chapter presents an evaluation of the behavior of tidal components at the interface between the two models, and suggests a method to reduce the discontinuities. Consistent with previous models, a marked decrease is found in the semidiurnal tide after the dramatic sudden stratospheric warming in late January 2009.