Space Weather Research and the US Air Force Office of Scientific Research (AFOSR)

Bellaire, Paul J.

doi:10.1007/1-4020-2754-0_17

Cited by 3 publications

(4 citation statements)

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“…Numerical simulations of the reaction of the Earth's magnetosphere are performed with the LFM [ Lyon et al , 2004; Wiltberger et al , 2005] version LTR‐2_1_1, the BATSRUS [ Powell et al , 1999; De Zeeuw et al , 2000; Gombosi et al , 2000] version 8.01, the GUMICS [ Janhunen et al , 2012] version 4‐HC‐1.11, and the Open‐GGCM [ Raeder , 1999; Raeder et al , 2001] version 3.1 MHD computer codes at the Community Coordinated Modeling Center (CCMC) [ Bellaire , 2004, 2006]. A set of simulations with the four codes are all run with the same solar wind conditions: these solar wind parameters are listed in Table 3.…”

Section: Reaction Of the Earth's Magnetosphere To Sudden Wind Shearmentioning

confidence: 99%

The effect of sudden wind shear on the Earth's magnetosphere: Statistics of wind shear events and CCMC simulations of magnetotail disconnections

Borovsky

2012

J. Geophys. Res.

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[1] The solar wind is filled with strong current sheets and sudden velocity shears; often the two are co-located. Sudden velocity shears at 1 AU are statistically analyzed using ACE measurements from 1998 to 2008. The occurrence rates of passage and the orientations of the shear planes are examined. For shear layers with vector velocity changes |Dv| > 50 km/s, an average of $12 pass the Earth per day. In the fast wind, $60 sudden shear layers pass the Earth per day (about 2.5 per hour). To explore the effects of sudden wind shears on the Earth's magnetosphere, global magnetospheric MHD simulations with four different simulation codes are performed at the Community Coordinated Modeling Center (CCMC) with north-south and east-west wind shears. Windsock movement of the magnetotail is analyzed and comet-like disconnections of the magnetotail and magnetosheath are examined. Sudden changes in the cross-polar-cap potential and ionospheric Joule dissipation are seen as the shear layers pass the Earth. Other potential effects of sudden wind shear on the magnetosphere are discussed.

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Section: Reaction Of the Earth's Magnetosphere To Sudden Wind Shearmentioning

confidence: 99%

The effect of sudden wind shear on the Earth's magnetosphere: Statistics of wind shear events and CCMC simulations of magnetotail disconnections

Borovsky

2012

J. Geophys. Res.

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“…[11] Simulations of the solar wind -driven magnetosphere-ionosphere system are run at the Community Coordinated Modeling Center (CCMC) [Bellaire, 2004] at NASA/Goddard Space Flight Center using the Block-Adaptive-Tree Solarwind Roe Upwind Scheme (BATSRUS) 3-D MHD code [Powell et al, 1999;De Zeeuw et al, 2000;Gombosi et al, 2000;Ridley et al, 2004;A. J. Ridley and G. Toth, unpublished data, 2008].…”

Section: Mhd Simulationsmentioning

confidence: 99%

Polar cap potential saturation, dayside reconnection, and changes to the magnetosphere

2009

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[1] Global MHD simulations of the Earth's magnetosphere using the Block-AdaptiveTree Solarwind Roe Upwind Scheme code at the Community Coordinated Modeling Center are run with a high-resolution dayside magnetopause and variable-resolution nearEarth regions to study the phenomena of polar cap saturation. In the simulations a resistive spot is maintained on the moving magnetopause to ensure that the correct dayside reconnection rate is obtained. The solar wind parameters are held fixed, and the ionospheric Pedersen conductivity is varied. Strong reduction of the cross-polar cap potential is observed, with modest increases in the cross-polar cap current, and no changes in the local and global reconnection rates. Changes in the magnetosphere associated with the saturation of the polar cap are explored: these include a weakening of the dayside magnetic field strength, an equatorward shift of the cusps, a flattening in Z of the closed field line region of the dayside magnetosphere, and a taillike stretching of the dipole field lines at the terminator. Measurements of the currents and voltages of the polar cap indicate that the solar wind acts like a current-limited voltage generator. A simple circuit model is analyzed using measurements from the MHD simulations, and physically reasonable values for the circuit elements are obtained. Nine models for polar cap saturation are assessed against the findings of the present study.

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“…Similarly, the tremendously successful NSF CubeSat program also paved the way toward improved space weather observational capabilities (Baker & Cleave, ; Moretto & Robinson, ; National Academies of Sciences, Engineering, and Medicine, ). NSF demonstrated its commitment to transitioning research to operations by investing in the startup of the Community Coordinated Modeling Center (CCMC). Along with the U.S. Air Force, NASA, and NOAA, NSF played a critical role in the organization and management of the Center (Bellaire, ). NSF's initial and continuing investment of up to $500K per year was critical to getting the center started and continues to be an important component of CCMC support.…”

Section: The Last 25 Yearsmentioning

confidence: 99%

“…NSF demonstrated its commitment to transitioning research to operations by investing in the startup of the Community Coordinated Modeling Center (CCMC). Along with the U.S. Air Force, NASA, and NOAA, NSF played a critical role in the organization and management of the Center (Bellaire, 2004). NSF's initial and continuing investment of up to $500K per year was critical to getting the center started and continues to be an important component of CCMC support.…”

Section: 1002/2017sw001778mentioning

confidence: 99%

The Critical Role of the Research Community in Space Weather Planning and Execution

Robinson

Behnke²,

Moretto

2018

Space Weather

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The explosion of interest in space weather in the last 25 years has been due to a confluence of efforts all over the globe, motivated by the recognition that events on the Sun and the consequent conditions in interplanetary space and Earth's magnetosphere, ionosphere, and thermosphere can have serious impacts on vital technological systems. The fundamental research conducted at universities, government laboratories, and in the private sector has led to tremendous improvements in the ability to forecast space weather events and predict their impacts on human technology and health. The mobilization of the research community that made this progress possible was the result of a series of actions taken by the National Science Foundation (NSF) to build a national program aimed at space weather. The path forward for space weather is to build on those successes through continued involvement of the research community and support for programs aimed at strengthening basic research and education in academia, the private sector, and government laboratories. Investments in space weather are most effective when applied at the intersection of research and applications. Thus, to achieve the goals set forth originally by the National Space Weather Program, the research community must be fully engaged in the planning, implementation, and execution of space weather activities, currently being coordinated by the Space Weather Operations, Research, and Mitigation Subcommittee under the National Science and Technology Council.

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Space Weather Research and the US Air Force Office of Scientific Research (AFOSR)

Cited by 3 publications

References 0 publications

The effect of sudden wind shear on the Earth's magnetosphere: Statistics of wind shear events and CCMC simulations of magnetotail disconnections

The effect of sudden wind shear on the Earth's magnetosphere: Statistics of wind shear events and CCMC simulations of magnetotail disconnections

Polar cap potential saturation, dayside reconnection, and changes to the magnetosphere

The Critical Role of the Research Community in Space Weather Planning and Execution

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