Abstract:
The propagation of galactic and solar cosmic rays in the solar wind (SW) can be strongly influenced by the SW fluctuations properties. Magnetohydrodynamic scale fluctuations in the solar wind are usually highly anisotropic, and have also been found to exhibit different properties in regions of high and low solar wind speed. Previous studies analyzed the anisotropy properties of the solar wind magnetic fluctuations at scales of the order of (105 ? 106) km (inertial range) using two times ? single point measurements (assuming the Taylor frozen-in hypothesis), and found that the fluctuations in the fast solar wind tend to reside in wave vectors with their parallel component (to the mean magnetic field) larger than the perpendicular one, while the fluctuations in the slow wind present the opossite trend. In the present study we compare the magnetic autocorrelation function in the solar wind obtained with two times ? single point observations (from a single spacecraft) with the same quantity obtained from single time ? two points measurements (from simultaneous observations of two spacecraft, observing the pure spatial structures). We preliminarily compare also previous results of the anisotropy of the solar wind fluctuations, obtained from a single spacecraft, with our new multispacecraft analysis using combining observations from the ACE and Wind spacecraft.
Registro:
| Documento: |
Conferencia
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| Título: | ACE/Wind multispacecraft analysis of the magnetic correlation in the solar wind |
| Autor: | Dasso, S.; Matthaeus, W.H.; Weygand, J.M.; Chuychai, P.; Milano, L.J.; Smith, C.W.; Kivelson, M.G. |
| Ciudad: | Merida, Yucatan |
| Filiación: | Instituto de Astronomía y Física Del Espacio (IAFE), Departamento de Física, CONICET, Argentina
Bartol Res. Institute, Department of Physics and Astronomy, University of Delaware, Newark, DE, United States
IGPP, UCLA, Los Angeles, CA, United States
Institute of Earth, Oceans and Space, University of New Hampshire, NH, United States
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| Palabras clave: | Anisotropy; Cosmic rays; Magnetohydrodynamics; Spacecraft; Anisotropy property; Autocorrelation functions; Magnetic correlation; Magnetic fluctuation; Mean magnetic field; Parallel component; Simultaneous observation; Single-point measurement; Solar wind |
| Año: | 2007
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| Volumen: | 1
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| Número: | SH
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| Página de inicio: | 625
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| Página de fin: | 628
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| Título revista: | 30th International Cosmic Ray Conference, ICRC 2007
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| Título revista abreviado: | Proc. Int. Cosm. Ray Conf., ICRC
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| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS22749_v1_nSH_p625_Dasso |
Referencias:
- Dr̈oge, W., Particle scattering by magnetic fields (2000) Space Science Reviews, 93, pp. 121-151
- Parhi, S., Bieber, J.W., Matthaeus, W.H., Burger, R.A., Sensitivity of cosmic ray modulation to the correlation length (2002) Geophys. Rev. Lett, 29, pp. 99-101
- Jokipii, J.R., Cosmic-ray propagation i Charged particles in a random magnetic field (1966) Astrophys. J, 146, p. 480
- Montgomery, D.C., Turner, L., Anisotropic magnetohydrodynamic turbulence in a strong external magnetic field (1981) Phys. Fluids, 24, p. 825
- Shebalin, J.V., Matthaeus, W.H., Montgomery, D., Anisotropy in MHD turbulence due to a mean magnetic field (1983) J. Plasma Phys., 29, p. 525
- Matthaeus, W.H., Goldstein, M.L., Roberts, D.A., Evidence for the presence of quasitwo-dimensional nearly incompressible fluctuations in the solar wind (1990) J. Geophys. Res, 95, pp. 20673-20683
- Tu, C.-Y., Marsch, E., (1995) MHD Structures, Waves and Turbulence in the Solar Wind: Observations and Theories, , Dordrecht Kluwer,-c1995
- Milano, L.J., Dasso, S., Matthaeus, W.H., Smith, C., Spectral distribution of the cross helicity in the solar wind (2004) Phys. Rev. Lett., 93, p. 155005
- Dasso, S., Milano, L.J., Matthaeus, W.H., Smith, C.W., Anisotropy in fast and slow solar wind fluctuations (2005) Astrophys. J, 635, pp. L181-L184
- Matthaeus, W.H., Dasso, S., Weygand, J.M., Milano, L.J., Smith, C.W., Kivelson, M.G., Spatial correlation of solar-wind turbulence from two-point measurements (2005) Physical Review Letters, 95 (23), p. 231101
- Osman, K.T., Horbury, T.S., Multispacecraft measurement of anisotropic correlation functions in solarwind turbulence (2007) Astrophys. J, 654, pp. L103-L106
- Weygand, J.M., Matthaeus, W., Dasso, S., Kivelson, M.G., W R J, Taylor scale and effective magnetic reynolds number determination from plasma sheet and solar wind magnetic field fluctuations (2007) J. Geophys. Res., , submittedA4 -
Citas:
---------- APA ----------
Dasso, S., Matthaeus, W.H., Weygand, J.M., Chuychai, P., Milano, L.J., Smith, C.W. & Kivelson, M.G.
(2007)
. ACE/Wind multispacecraft analysis of the magnetic correlation in the solar wind. 30th International Cosmic Ray Conference, ICRC 2007, 1(SH), 625-628.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS22749_v1_nSH_p625_Dasso [ ]
---------- CHICAGO ----------
Dasso, S., Matthaeus, W.H., Weygand, J.M., Chuychai, P., Milano, L.J., Smith, C.W., et al.
"ACE/Wind multispacecraft analysis of the magnetic correlation in the solar wind"
. 30th International Cosmic Ray Conference, ICRC 2007 1, no. SH
(2007) : 625-628.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS22749_v1_nSH_p625_Dasso [ ]
---------- MLA ----------
Dasso, S., Matthaeus, W.H., Weygand, J.M., Chuychai, P., Milano, L.J., Smith, C.W., et al.
"ACE/Wind multispacecraft analysis of the magnetic correlation in the solar wind"
. 30th International Cosmic Ray Conference, ICRC 2007, vol. 1, no. SH, 2007, pp. 625-628.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS22749_v1_nSH_p625_Dasso [ ]
---------- VANCOUVER ----------
Dasso, S., Matthaeus, W.H., Weygand, J.M., Chuychai, P., Milano, L.J., Smith, C.W., et al. ACE/Wind multispacecraft analysis of the magnetic correlation in the solar wind. Proc. Int. Cosm. Ray Conf., ICRC. 2007;1(SH):625-628.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_NIS22749_v1_nSH_p625_Dasso [ ]
