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Characterization of the Complex Ejecta Measured In Situ on 19 – 22 March 2001 by Six Different Methods

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Abstract

This article proposes some traditional and newly developed methods to evaluate the properties of the magnetic cloud (MC) observed on 19 – 22 March 2001. We used physical and mathematical approaches to analyze the time series of solar wind plasma and interplanetary magnetic field data. Two methods that are commonly used to derive the MC properties, the minimum variance analysis and the Grad–Shafranov reconstruction, were applied to derive the properties of the MCs by fitting in situ measurements in the corresponding time intervals, as discussed in previous studies. Other methods developed by us (a travel time analysis of the interplanetary coronal mass ejection, spatio-temporal entropy, nonlinear fluctuation analysis, and wavelet analysis) are used as auxiliary tools to help identify whether the event consists of one or possibly two MCs. Our results suggest that the 19 – 22 March 2001 event was composed by two MCs. Our results agree with those of other researchers who used various fitting methods and identified the solar origin of this event as two CMEs.

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Notes

  1. http://www.srl.caltech.edu/ACE/ASC/level2/index.html .

  2. http://cdaweb.gsfc.nasa.gov/istp_public/ .

  3. ftp://nssdcftp.gsfc.nasa.gov/spacecraft_data/ace/4_min_merged_mag_plasma/ .

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Acknowledgements

This work was supported by grants from CNPq (grants 483226/2011-4, 312246/2013-7, 306038/2015-3, 165873/2015, 301441/2013-8), FAPESP (grants 2012/072812-2, 2015/25624-2) and CAPES (grants 1236-83/2012). A. Ojeda-González thanks CAPES and CNPq (grant 141549/2010-6) for his Ph.D. scholarship and CNPq (grant 150595/2013-1, 503790/2012-5) for postdoctoral research support. V. Klausner wishes to thank CNPq for financial support (grants 402386/2015-9 and 165873/2015-9). We also wish to thank the authors of the CME catalog. The CME catalog is generated and maintained at the CDAW Data Center by NASA and The Catholic University of America in cooperation with the Naval Research Laboratory. SOHO is a project of international cooperation between ESA and NASA. We would also like to thank Christian Möstl and Charles J. Farrugia for the MATLAB program package we used for the Grad–Shafranov reconstruction of magnetic flux ropes. We also wish to thank the anonymous referee and the editors, specially, C.H. Mandrini.

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Authors and Affiliations

  1. Physics and Astronomy Laboratory, Universidade do Vale do Paraíba-UNIVAP, São José dos Campos, São Paulo, Brazil

    Arian Ojeda-González, Virginia Klausner & Alan Prestes

  2. Division of Space Geophysics, National Institute for Space Research, INPE, São José dos Campos, São Paulo, Brazil

    Odim Mendes

  3. Associate Laboratory of Applied Computing and Mathematics, National Institute for Space Research, INPE, São José dos Campos, São Paulo, Brazil

    Margarete Oliveira Domingues

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  1. Arian Ojeda-González
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Ojeda-González, A., Klausner, V., Mendes, O. et al. Characterization of the Complex Ejecta Measured In Situ on 19 – 22 March 2001 by Six Different Methods. Sol Phys 292, 160 (2017). https://doi.org/10.1007/s11207-017-1182-4

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