caa a22 4500 445346078 CHVBK 20180317142829.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s11207-011-9717-6 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9717-6 In Situ Signatures of Interchange Reconnection between Magnetic Clouds and Open Magnetic Fields: AMechanism for the Erosion of Polar Coronal Holes? [Elektronische Daten] [Benoit Lavraud, Mathew Owens, Alexis Rouillard] We outline a method to determine the direction of solar open flux transport that results from the opening of magnetic clouds (MCs) by interchange reconnection at the Sun based solely on in-situ observations. This method uses established findings about i) the locations and magnetic polarities of emerging MC footpoints, ii) the hemispheric dependence of the helicity of MCs, and iii) the occurrence of interchange reconnection at the Sun being signaled by uni-directional suprathermal electrons inside MCs. Combining those observational facts in a statistical analysis of MCs during solar cycle 23 (period 1995 - 2007), we show that the time of disappearance of the northern polar coronal hole (1998 - 1999), permeated by an outward-pointing magnetic field, is associated with a peak in the number of MCs originating from the northern hemisphere and connected to the Sun by outward-pointing magnetic field lines. A similar peak is observed in the number of MCs originating from the southern hemisphere and connected to the Sun by inward-pointing magnetic field lines. This pattern is interpreted as the result of interchange reconnection occurring between MCs and the open field lines of nearby polar coronal holes. This reconnection process closes down polar coronal hole open field lines and transports these open field lines equatorward, thus contributing to the global coronal magnetic field reversal process. These results will be further constrainable with the rising phase of solar cycle 24. Springer Science+Business Media B.V., 2011 Coronal mass ejection nationallicence Heliospheric topology nationallicence Solar cycle nationallicence Solar wind suprathermal electrons nationallicence Lavraud Benoit Institut de Recherche en Astrophysique et Planetologie, Université de Toulouse (UPS), Toulouse, France aut Owens Mathew The Blackett Laboratory, Imperial College, London, UK aut Rouillard Alexis Institut de Recherche en Astrophysique et Planetologie, Université de Toulouse (UPS), Toulouse, France aut Solar Physics Springer Netherlands 270/1(2011-05-01), 285-296 0038-0938 270:1<285 2011 270 11207 https://doi.org/10.1007/s11207-011-9717-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9717-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lavraud Benoit Institut de Recherche en Astrophysique et Planetologie, Université de Toulouse (UPS), Toulouse, France aut NATIONALLICENCE 700 1- Owens Mathew The Blackett Laboratory, Imperial College, London, UK aut NATIONALLICENCE 700 1- Rouillard Alexis Institut de Recherche en Astrophysique et Planetologie, Université de Toulouse (UPS), Toulouse, France aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 270/1(2011-05-01), 285-296 0038-0938 270:1<285 2011 270 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer