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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Impacts of solar disturbances on the heliosphere and magnetosphere Wang Chi State Key Laboratory of Space Weather, Chinese Academy of Sciences Interplanetary disturbances, including interplanetary shocks and ICMEs, disturbance not only the magnetosphere-ionosphere system but also the heliosphere. This talk will be divided into two parts, the first part will discuss the impacts of solar disturbances on the heliosphere. We present a multi-fluid MHD model, which takes into account the effects of pickup ions, to describe the solar wind in the outer heliosphere, since the solar wind in the outer heliosphere is fundamentally different from that in the inner heliosphere, with the influence of the local interstellar source becomes significant. Using observations from multiple spacecraft distributed throughout the heliosphere, we traced the propagation of ICMEs and their driven shocks from 1 AU to the location of Voyager 2. The Bastille Day, 2000 event and April 2001 event are modeled in detail. Interplanetary (IP) shocks disturb the magnetosphere-ionosphere system resulting in geosynchronous magnetic field changes and sudden impulses observed by ground-based magnetometers. We perform a statistical survey of geospace magnetic field responses to IP shocks. The magnitude of the geosynchronous magnetic field (dBz) responses to IP shocks depends strongly on local time, which peaks near the noon meridian, however the relative magnitude of the responses depends only weakly on local time. Negative responses (where dBz is negative) were sometimes observed in the nightside of the magnetosphere even though the IP shocks always caused increases in the solar wind dynamic pressure. The 3D global MHD simulations reproduce the main characters of the observations. The dBz at the geosynchronous orbit near local noon and the amplitude of sudden impulses (dSYM-H) on the ground are highly correlated. We show that sudden impulses (SIs) can be used to estimate key parameters at L1 point and geosynchronous orbit, including the change of square-root the solar wind dynamic pressure across the shock, and the associated geosynchronous magnetic field changes near the sub-solar region. Empirical formulae deduced from observations can be used to estimate certain IP shock characteristics and geosynchronous magnetic field changes from observed sudden impulse data observed on the ground with prediction efficiency as high as 89%.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Tidal coupling: Recent insights and challenges Ward William 1 , Wang Ding-Yi 1 , Du Jian 2 , Oberheide Jens 3 , Goncharenko Larisa 4 , Nakamura Takuji 5 , Singer Werner 6 , Smith Anne 1 Department of Physics, University of New Brunswick, Canada, 2 DAMTP, Cambridge University, United Kingdom, 3 Department of Physics and Astronomy, Clemson University, USA, 4 MIT Haystack Observatory, USA, 5 National Institute of Polar Research, Japan, 6 Leibniz- Institute of Atmospheric Physics, Germany, 7 It is now close to 20 years since the launch of the UARS satellite and the topic of atmospheric tides, which was considered close to being solved at that time, is still a very active area of research. Where significant advances have been made over the past couple of decades, is in the recognition of the complexity of the tidal wave system and the extent to which they permeate the middle and upper atmosphere. Non-migrating tides (in addition to the migrating tides) are now recognized as providing substantial contributions to the energetics and dynamics of the atmosphere and interference effects between components result in strong longitudinal variations in tidal amplitudes. The CAWSES 1 tidal campaigns which included data from satellites (TIMED in particular), ground based observations and tidal analyses of extended general circulation models have been a contributing factor in developing this understanding. However, the remaining questions are substantial. Source and dissipation mechanisms of the various components, how they influence mixing processes and gravity wave propagation and dissipation, what their internal interactions are, and what their dynamical, chemical and ionospheric effects are, remain uncertain and still need to be determined. Research into these questions remains challenging since a global and whole atmosphere perspective is required to find solutions. In this talk, progress in our understanding of tides is reviewed and the outstanding problems are summarized.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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