Geospace imaging using Thomson scattering

Meier, R. R.; Englert, C. R.; Chua, D.; Socker, D. G.; Picone, J. M.; Carter, T.; Huba, J. D.; Slinker, S. P.; Krall, J.; Vincent, W S

doi:10.1016/j.jastp.2008.10.007

Cited by 3 publications

(1 citation statement)

References 40 publications

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“…The present implementation of SAMI3 uses an externally specified E × B drift function, such as a simple sinusoid or the Fejer‐Scherliess model [ Scherliess and Fejer , 1999]. The maximum latitudinal extent of SAMI3 is ±89° and altitudes as large as 8 R e are allowable [ Meier et al , 2009].…”

Section: Sami3 Modeling Of Day‐to‐day Variability Of Equatorial Anomamentioning

confidence: 99%

Day‐to‐day variability of the equatorial ionization anomaly and scintillations at dusk observed by GUVI and modeling by SAMI3

et al. 2009

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[1] The day-to-day variability in ionospheric irregularity generation giving rise to equatorial scintillation has remained an unresolved issue over many decades. We take a fresh look at the problem utilizing the global imagery provided by the Global Ultraviolet Imager (GUVI) instrument on NASA's Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics satellite. GUVI has been acquiring images of 135.6-nm emission in the Earth's ionosphere-thermosphere system since 2001. These GUVI disk images at dusk have been used to identify cases where the equatorial ionization anomaly (EIA) crests lie near the magnetic equator over a relatively narrow longitude range, so that the anomaly looks collapsed. A 16-month period of GUVI data collected during evening at solar maximum is used to study the morphology of these so-called collapses, since the EIA collapse is shown to be linked to the suppression of equatorial plasma bubbles and scintillations. In particular, we look at the June solstice, during which the Atlantic and Pacific show very different climatology and EIA collapses are most frequent in the GUVI data. On the other hand, EIA collapses are a relatively rare occurrence during the equinox period when scintillations are most prevalent globally. We obtained a few dramatic examples of day-to-day variability in EIA behavior and scintillations over India. The Sami3 is Also a Model of the Ionosphere (SAMI3) model was used to investigate the conditions during the evening collapse of the anomaly in the Indian longitude sector, where measurements of total electron content (TEC) and scintillations and estimates of the daytime vertical drifts and those at dusk were available. Results from SAMI3 show that the observed collapse of the anomaly at dusk can be simulated by a reversal of the upward vertical drift in midafternoon in agreement with the drift estimates from magnetometer observations. Such reversed vertical drifts at this time of the day are generally seen during counterelectrojet events. Introduction of neutral winds into SAMI3 better approximates the dusk behavior of TEC at low-latitude stations in India. This study reveals that the longitudinally confined EIA collapse may explain some of the differences in day-to-day variability of scintillations at different locations around the globe.

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Section: Sami3 Modeling Of Day‐to‐day Variability Of Equatorial Anomamentioning

confidence: 99%

Day‐to‐day variability of the equatorial ionization anomaly and scintillations at dusk observed by GUVI and modeling by SAMI3

et al. 2009

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Terrestrial and Martian space weather: A complex systems approach

Chian,

Miranda,

Bertucci

et al. 2024

Journal of Atmospheric and Solar-Terrestrial Physics

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An Investigation of the Seasonal Variation of Equatorial Electrodynamics and Scintillation Using a Coupled Atmosphere-Ionosphere Model

McDonald

Huba

2009

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The goal of this work is to determine the physical processes responsible for the observed seasonal patterns in the occurrence and intensity of scintillation in the Earth's low-latitude ionosphere. An improved understanding of the physics will result in more sophisticated modeling and forecasting tools that will benefit the Navy. OBJECTIVES The objective of this study is to couple a three-dimensional physics based model of the ionosphere (SAMI3) with a global circulation model (TIME-GCM) and a tidal and planetary wave model (GSWM) in order to investigate lower atmospheric influences on the seasonal and longitudinal variability in the occurrence of scintillation. During the first two years, we will also use the SAMI3/ESF "wedge" model to gain insight into how the instabilities are quenched. In the third year, studies will be conducted with the ESF portion fully coupled into SAMI3. APPROACH The SAMI3 interface will be modified as necessary to accommodate the output from the NCAR TIME-GCM. Simulations with the coupled model will be conducted to determine the effects of the lower atmosphere on the ionosphere. The "background" ionosphere generated from these simulations will be used in the SAMI3/ESF model to explore the conditions under which scintillation occurs.

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Geospace imaging using Thomson scattering

Cited by 3 publications

References 40 publications

Day‐to‐day variability of the equatorial ionization anomaly and scintillations at dusk observed by GUVI and modeling by SAMI3

Day‐to‐day variability of the equatorial ionization anomaly and scintillations at dusk observed by GUVI and modeling by SAMI3

Terrestrial and Martian space weather: A complex systems approach

An Investigation of the Seasonal Variation of Equatorial Electrodynamics and Scintillation Using a Coupled Atmosphere-Ionosphere Model

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