M-I Coupling: An Observational and Modeling Study Under Conditions of Extreme Forcing
M-I Coupling: An Observational and Modeling Study Under Conditions of Extreme Forcing
批准号:
0334506
负责人:
Cesar Valladares
金额:
$0.0万
依托单位:
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
2004
资助国家:
美国
项目状态:
已结题
起止时间:
2004-03-01 至 2008-02-29
中文摘要
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英文摘要
The investigators will study magnetosphere-ionosphere coupling through coordinated observational and modeling of the effects of the imposition of large polar-cap electric potentials on the M-I system. The focus will be on very large storms, i.e. superstorms, which exhibit highly unusual electrodynamic behavior. The evolution of the system and dissipation of energy are central to an understanding of how the coupled system proceeds from a highly energized state back to equilibrium. Previous studies have revealed during a detailed event study of a superstorm, that the observed Region 1 and 2 field-aligned currents (FACs), conductances and particle precipitation provided many surprises: the Region 2 FACs were amongst the largest ever observed in the ionosphere yet there was little magnetic signature on the ground; the conductances were many times larger than that predicted, and the measured precipitating electron flux consisted entirely of low-energy (E200eV) particles. Similar behavior was manifest during other superstorms, which occurred during the recent solar maximum period. It is clear that the realm of behavior demonstrated during superstorms is beyond current understanding of M-I coupling. The investigators will study a series of superstorms in order to develop a qualitative and quantitative description of the electrodynamic properties of the ionosphere under conditions of unusually large polar-cap potential distributions. They will determine the evolution of electric fields, field-aligned currents and conductances during the course of several superstorms through direct observations of the plasma drifts, particle precipitation and magnetic perturbations. They will extend the database of observed plasma and magnetic measurements by using a global data-driven model of the ionosphere. They will also use a simplified version of the Rice Convection Model to consider the effect of the imposed polar-cap potential on magnetospheric convection. Guided by a model for magnetosphere-ionosphere coupling, the observations of the coupling currents and fields will provide a unified picture of the temporal and spatial evolution of the electrodynamic processes at work during the superstorm. Observations of plasmas and magnetic fields made by DMSP at 840 km altitude are limited to the local times sampled by the satellites, which are approximately 06-18 LT and 09-21 LT. While the sun-synchronous orbits allow continuous monitoring of these local time sectors, information on other local times and altitudes is lacking. Investigators will supplement the DMSP observations with global modeling of the ionosphere under conditions of extreme forcing. This research will lead to an improved understanding of M-I coupling processes, in particular the effects of large polar-cap potentials imposed on the ionosphere. It will yield quantitative ranges for electric fields, FACs, conductances and particle precipitation, which have never been reported systematically for magnetic storms. These parameters are essential for any detailed model of the evolution of the M-I system after the commencement of large magnetic activity. The study will be significant in modeling of energy balance and dissipation, the loci and time scales for these processes, all of which are central to the problem of M-I coupling.
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DASI Track 2: Low-latitude Ionospheric Sensor Network (LISN) Investigations of Traveling Ionospheric Disturbances and Plasma Irregularities
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批准号:1933056
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项目类别:Standard Grant
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资助金额:$90.0万
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财政年份:2019
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负责人:Cesar Valladares
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依托单位:
Collaborative Research: The Thermosphere-Ionosphere Coupling Using the Low-latitude Ionospheric Sensor Network (LISN) Distributed Observatory
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批准号:1724133
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项目类别:Standard Grant
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资助金额:$24.0万
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财政年份:2017
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负责人:Cesar Valladares
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依托单位:
Collaborative Research: Causes and Consequences of the Gradients in the Vertical Plasma Drift in the Equatorial Plasma Drift Vortex
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批准号:1563025
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项目类别:Continuing Grant
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资助金额:$15.75万
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财政年份:2016
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负责人:Cesar Valladares
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依托单位:
CEDAR: Traveling Ionospheric Disturbances (TIDs) Excited by Tropospheric Phenomena and their Effect on Plasma Instabilities
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批准号:1552161
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项目类别:Standard Grant
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资助金额:$37.41万
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财政年份:2016
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负责人:Cesar Valladares
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依托单位:
Collaborative Research: Investigations of the Mid-Latitude Ionosphere during Magnetic Disturbances: Observations, Modeling and Space Weather Impacts
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批准号:1242476
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项目类别:Continuing Grant
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资助金额:$34.76万
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财政年份:2013
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负责人:Cesar Valladares
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依托单位:
Collaborative Research: The Low-latitude Ionosphere and the Development of Forecasting Techniques Using the Low-latitude Ionosphere Sensor Network (LISN) Distributed Observatory
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批准号:1135675
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项目类别:Continuing Grant
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资助金额:$95.0万
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财政年份:2012
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负责人:Cesar Valladares
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依托单位:
US-South America Workshop to Foster Space Weather Investigation using the LISN Observatory
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批准号:1132610
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项目类别:Standard Grant
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资助金额:$4.59万
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财政年份:2011
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负责人:Cesar Valladares
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依托单位:
Development of the First Distributed Observatory Dedicated to Studies of the Low Latitude Ionosphere and Atmosphere
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批准号:0521487
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项目类别:Standard Grant
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资助金额:$122.05万
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财政年份:2005
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负责人:Cesar Valladares
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依托单位:
Studies of the Dynamics of the Equatorial Ionosphere Using a Latitudinal Network of Global Positioning System (GPS) Receivers
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批准号:0243294
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项目类别:Continuing Grant
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资助金额:$27.95万
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财政年份:2003
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负责人:Cesar Valladares
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依托单位:
International Workshop on Space Weather Effects on Communications and Navigation Signals; Boston, Massachusetts, June 7 - 8, 2001
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批准号:0004458
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项目类别:Standard Grant
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资助金额:$3.2万
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财政年份:2001
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负责人:Cesar Valladares
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依托单位:
CEDAR: Studies of the Dynamics of Equatorial F-region Irregularities Using Scintillation and Global Positioning System (GPS) Receivers and a Numerical Model
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批准号:0123560
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项目类别:Continuing Grant
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资助金额:$20.68万
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财政年份:2001
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负责人:Cesar Valladares
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依托单位:
Space Weather of the Low-latitude Density and Forecast of Equatorial Spread-F Phenomena
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批准号:9819912
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项目类别:Continuing Grant
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资助金额:$15.37万
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财政年份:1999
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负责人:Cesar Valladares
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依托单位:
CEDAR: MISETA--Ion-Neutral Coupling
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批准号:9714804
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项目类别:Continuing Grant
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资助金额:$14.84万
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财政年份:1998
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负责人:Cesar Valladares
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依托单位:
The Heiss Island Imaging Photometer
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批准号:9708101
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项目类别:Continuing Grant
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资助金额:$29.24万
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财政年份:1997
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负责人:Cesar Valladares
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依托单位:
U.S.-France Cooperative Research: the Formation of Patches and Blobs
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批准号:9603362
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项目类别:Standard Grant
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资助金额:$1.13万
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财政年份:1997
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负责人:Cesar Valladares
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依托单位:
CEDAR: Equatorial Plasma Structures and Electrodynamics Using Scintillation Technique
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批准号:9523966
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项目类别:Continuing Grant
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资助金额:$12.57万
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财政年份:1996
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负责人:Cesar Valladares
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依托单位:
Experimental and Modeling Studies of Polar Cap Patches and Auroral Blobs
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批准号:9404088
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项目类别:Continuing Grant
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资助金额:$15.22万
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财政年份:1994
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负责人:Cesar Valladares
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依托单位:
CEDAR: CEDAR/STEP Workshop on High-Latitude Plasma Structuring
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批准号:9202348
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项目类别:Standard Grant
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资助金额:$2.11万
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财政年份:1992
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负责人:Cesar Valladares
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依托单位:
CEDAR: MISETA: Evolution of Sub-km Irregularities and Their Drifts at Ancon, Peru
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批准号:9202350
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项目类别:Continuing Grant
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资助金额:$15.62万
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财政年份:1992
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负责人:Cesar Valladares
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依托单位:
Irregularity Modeling & Plasma Line Studies at High Latitudes
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批准号:9016465
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项目类别:Continuing Grant
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资助金额:$15.83万
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财政年份:1991
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负责人:Cesar Valladares
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依托单位:
海外基金