caa a22 4500 44534668X CHVBK 20180317142831.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s11207-010-9695-0 doi (NATIONALLICENCE)springer-10.1007/s11207-010-9695-0 Magnetic Discontinuities in the Near-Earth Solar Wind: Evidence of In-Transit Turbulence or Remnants ofCoronal Structure? [Elektronische Daten] [M. Owens, R. Wicks, T. Horbury] Fluctuations in the solar wind plasma and magnetic field are well described by the sum of two power law distributions. It has been postulated that these distributions are the result of two independent processes: turbulence, which contributes mainly to the smaller fluctuations, and crossing the boundaries of flux tubes of coronal origin, which dominates the larger variations. In this study we explore the correspondence between changes in the magnetic field with changes in other solar wind properties. Changes in density and temperature may result from either turbulence or coronal structures, whereas changes in composition, such as the alpha-to-proton ratio are unlikely to arise from in-transit effects. Observations spanning the entire ACE dataset are compared with a null hypothesis of no correlation between magnetic field discontinuities and changes in other solar wind parameters. Evidence for coronal structuring is weaker than for in-transit turbulence, with only ∼ 25% of large magnetic field discontinuities associated with a significant change in the alpha-to-proton ratio, compared to ∼ 40% for significant density and temperature changes. However, note that a lack of detectable alpha-to-proton signature is not sufficient to discount a structure as having a solar origin. Springer Science+Business Media B.V., 2010 Coronal heating nationallicence Magnetic discontinuities nationallicence Solar wind nationallicence Solar wind turbulence nationallicence Owens M. Space Environment Physics Group, Department of Meteorology, University of Reading, Earley Gate, PO Box 243, RG6 6BB, Reading, UK aut Wicks R. Space and Atmospheric Physics, Imperial College London, Prince Consort Road, SW7 2AZ, London, UK aut Horbury T. Space and Atmospheric Physics, Imperial College London, Prince Consort Road, SW7 2AZ, London, UK aut Solar Physics Springer Netherlands 269/2(2011-04-01), 411-420 0038-0938 269:2<411 2011 269 11207 https://doi.org/10.1007/s11207-010-9695-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-010-9695-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Owens M. Space Environment Physics Group, Department of Meteorology, University of Reading, Earley Gate, PO Box 243, RG6 6BB, Reading, UK aut NATIONALLICENCE 700 1- Wicks R. Space and Atmospheric Physics, Imperial College London, Prince Consort Road, SW7 2AZ, London, UK aut NATIONALLICENCE 700 1- Horbury T. Space and Atmospheric Physics, Imperial College London, Prince Consort Road, SW7 2AZ, London, UK aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 269/2(2011-04-01), 411-420 0038-0938 269:2<411 2011 269 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer