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Space Weather

Cover image for Space Weather

November 2011

Volume 9, Issue 11

  1. Technical Article

    1. Top of page
    2. Technical Article
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      Quiet time observations of the open-closed boundary prior to the CIR-induced storm of 9 August 2008

      Kevin D. Urban, Andrew J. Gerrard, Yajnavalkya Bhattacharya, Aaron J. Ridley, Louis J. Lanzerotti and Allan T. Weatherwax

      Version of Record online: 2 NOV 2011 | DOI: 10.1029/2011SW000688

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      Key Points

      • Using an array of fluxgate magnetometers, we can identify the open-closed boundary
      • This is shown to work 83% of the time during quiet geomagnetic conditions
      • This method will be useful for space weather modeling and verification
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      Estimation of solar energetic proton mission-integrated fluences and peak intensities for missions traveling close to the Sun

      D. Lario and R. B. Decker

      Version of Record online: 10 NOV 2011 | DOI: 10.1029/2011SW000708

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      Key Points

      • Method to estimate SEP mission-integrated fluences and peak intensities at <1 AU
      • Application of the method to the future Solar Probe Plus mission
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      A new class of long-term stable lunar resonance orbits: Space weather applications and the Interstellar Boundary Explorer

      D. J. McComas, J. P. Carrico, B. Hautamaki, M. Intelisano, R. Lebois, M. Loucks, L. Policastri, M. Reno, J. Scherrer, N. A. Schwadron, M. Tapley and R. Tyler

      Version of Record online: 10 NOV 2011 | DOI: 10.1029/2011SW000704

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      Key Points

      • IBEX is currently flying in a new, long-term stable lunar resonant orbit
      • Lunar resonance orbits would be excellent for space weather missions
      • IBEX has already demonstrated new magnetospheric ENA imaging capabilities
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      Automatic recognition of complex magnetic regions on the Sun in GONG magnetogram images and prediction of flares: Techniques for the flare warning program Flarecast

      Graham A. Steward, Vasili V. Lobzin, Phil J. Wilkinson, Iver H. Cairns and Peter A. Robinson

      Version of Record online: 16 NOV 2011 | DOI: 10.1029/2011SW000703

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      Key Points

      • A technique is developed for automatic recognition of active regions and SPILs
      • A technique is developed for solar flare predictions
      • These techniques are implemented in the flare warning program Flarecast
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      Effects of neutral point reactors and series capacitors on geomagnetically induced currents in a high-voltage electric power transmission system

      Esko Arajärvi, Risto Pirjola and Ari Viljanen

      Version of Record online: 23 NOV 2011 | DOI: 10.1029/2011SW000715

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      Key Points

      • GIC can be reduced by installing reactors or capacitors in a power grid
      • Choosing the best locations for reactors and capacitors is not straightforward
      • A poor choice of location may lead to a larger GIC risk in the network
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      Lognormal Kalman filter for assimilating phase space density data in the radiation belts

      D. Kondrashov, M. Ghil and Y. Shprits

      Version of Record online: 30 NOV 2011 | DOI: 10.1029/2011SW000726

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      Key Points

      • Filter improves data assimilation method for prediction of phase space density
      • Modification of Kalman filter done by log-transformed, 1-D radial diffusion model
      • This improvement is inferred via the variance of the innovation sequence

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