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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

CORRELATION OF ELECTRON PATH LENGTHS OBSERVED IN THE HIGHLY WOUND OUTER REGION OF MAGNETIC CLOUDS WITH THE SLAB FRACTION OF MAGNETIC TURBULENCE IN THE DISSIPATION RANGE

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Author(s):
Tan, Lun C. [1, 2] ; Reames, Donald V. [3] ; Ng, Chee K. [4] ; Shao, Xi [1, 2] ; Wang, Linghua [5]
Total Authors: 5
Affiliation:
[1] Univ Maryland, Dept Astron, College Pk, MD 20742 - USA
[2] Univ Maryland Baltimore Cty, Goddard Planetary Heliophys Inst, Baltimore, MD 21228 - USA
[3] Univ Maryland, Inst Phys Sci & Technol, College Pk, MD 20742 - USA
[4] George Mason Univ, Coll Sci, Fairfax, VA 22030 - USA
[5] Peking Univ, Dept Geophys, Beijing 100871 - Peoples R China
Total Affiliations: 5
Document type: Journal article
Source: ASTROPHYSICAL JOURNAL; v. 786, n. 2 MAY 10 2014.
Web of Science Citations: 5
Abstract

Three magnetic cloud events, in which solar impulsive electron events occurred in their outer region, are employed to investigate the difference of path lengths L-0eIII traveled by non-relativistic electrons from their release site near the Sun to the observer at 1 AU, where L-0eIII = v(1) x (t(1) - t(III)), v(1) and t(1) being the velocity and arrival time of electrons in the lowest energy channel (similar to 27 keV) of the Wind/3DP/SST sensor, respectively, and t(III) being the onset time of type III radio bursts. The deduced L0eIII value ranges from 1.3 to 3.3 AU. Since a negligible interplanetary scattering level can be seen in both L-0eIII > 3 AU and similar to 1.2 AU events, the difference in L-0eIII could be linked to the turbulence geometry (slab or two-dimensional) in the solar wind. By using the Wind/MFI magnetic field data with a time resolution of 92 ms, we examine the turbulence geometry in the dissipation range. In our examination, similar to 6 minutes of sampled subintervals are used in order to improve time resolution. We have found that, in the transverse turbulence, the observed slab fraction is increased with an increasing L-0eIII value, reaching similar to 100% in the L-0eIII > 3 AU event. Our observation implies that when only the slab spectral component exists, magnetic flux tubes (magnetic surfaces) are closed and regular for a very long distance along the transport route of particles. (AU)

FAPESP's process: 10/19029-0 - 3D radiative transfer models: bridging theory and observations
Grantee:Alex Cavaliéri Carciofi
Support type: Regular Research Grants
FAPESP's process: 09/07477-1 - Probing atmospheres and circumstellar environments of Be stars and evolved low mass stars with interferometry and polarimetry
Grantee:Xavier Marie Alain Haubois
Support type: Scholarships in Brazil - Post-Doctorate