Hinode-3: 3rd Hinode Science Meeting
Hitotsubashi Memorial Hall, Tokyo
1–4 December, 2009

Observations of amplitude-phase synchronization, current
sheets and magnetic reconnections in CME source regions
and ICME shocks
Abraham C.-L. ChianNational Institute for Space Research (INPE), P. O. Box 515, Sao Jose dos
Campos-SP 12227-010, Brazil & Research Institute for Mathematical Sciences(RIMS), Kyoto University, Kyoto 606-8502, Japan

Rodrigo A. Miranda
National Institute for Space Research (INPE), P. O. Box 515, Sao Jose dos
Campos-SP 12227-010, Brazil & Research Institute for Mathematical Sciences(RIMS), Kyoto University, Kyoto 606-8502, Japan

Pablo R. Munoz
National Institute for Space Research (INPE), P. O. Box 515, Sao Jose dos
Campos-SP 12227-010, Brazil

Michio Yamada
Research Institute for Mathematical Sciences (RIMS), Kyoto University, Kyoto
606-8502, Japan
Abstract.
We apply nonlinear techniques to measure amplitude-phase synchronization due to multiscale interactions in the intermittent magnetic field
turbulence in two solar events: 1) the solar active region AR 10950 before andafter the X3.4 flare on 2006 December 13 and in situ detection of an ICME on
2006 December 14-16; 2) the solar active region AR 10720 on 2005 January 16
and in situ detection of an ICME on 2005 January 21-22. The first event isstudied by Hinode solar magnetograms and STEREO-A data of ICME, and thesecond event is studied by SOHO MDI magnetograms and ACE/Cluster data ofICME. First, we compare the nonlinear dynamics of the solar active region witha solar quiet region for each event using the Hinode (SOHO MDI) magnetogramsby computing kurtosis and the phase coherence index as a function of spatial
scale r. We observe that the variation of kurtosis and the phase coherence index
with r in the solar quiet regions is close to a Gaussian process with monofractal features. In contrast, the solar active regions exhibit multifractal featurescharacterized by an increase of kurtosis and the phase coherence index as thespatial scale r decreases which is a signature of coherent magnetic structures resulting from amplitude-phase synchronization in an intermittent magnetic field
turbulence. Next, we compare the nonlinear dynamics of the upstream anddownstream regions of the ICME shocks of two events using the STEREO-A(ACE/Cluster) magnetometer time series by computing kurtosis and the phasecoherence index as a function of time scale τ . In both events, the upstream anddownstream regions indicate non-Gaussian features in the two-point difference
statistics of amplitude and phase fluctuations, evidenced by a finite degree ofamplitude and phase synchronization in a wide range of time scales. The levelof intermittency for all scales computed by both kurtosis and the phase coherence index in the downstream region of the ICME shock is much higher thanthe upstream region. We show that the interplanetary magnetic field turbulence1

in the downstream region of an ICME shock is closely correlated with the geomagnetic turbulence detected by the ground magnetometer. Finally, we apply
single- and multi-spacecraft techniques to search for current sheets in an ICME
shock using the Cluster magnetic field data of the second event. Two large-scalecurrent sheets are detected at the leading boundary of the ICME ejecta using
the single-spacecraft technique, which display physical characteristics typical ofmagnetic reconnection exhausts in the solar wind.
Reference
Chian, A. C.-L., Kamide, Y., Rempel, E. L., Santana, W. M. 2006, JGR-Space
Phys. 111, A07S03, 10.1029.
Chian, A. C.-L., Miranda, R. A. 2009, Ann. Geophys. 27, 1789.
He, H. K., Chian, A. C.-L. 2003, Phys. Rev. Lett. 91, 034102.
Kamide, Y., Chian, A. C.-L. 2007, Handbook of the Solar-Terrestrial Environment. Springer, Berlin.
Koga, D., Chian, A. C.-L., Miranda, R. A., Rempel, E. L. 2007, Phys. Rev. E
75, 046401.