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On the temporal variability of the “strahl” and its relationship with solar wind characteristics: STEREO SWEA observations

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On the temporal variability of the “strahl” and its relationship with solar wind characteristics: STEREO SWEA observations. / Louarn, Philippe; Dieval, Catherine; Genot, Vincent et al.
In: Solar Physics, Vol. 259, No. 1, 07.07.2009, p. 311-321.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Louarn, P, Dieval, C, Genot, V, Lavraud, B, Opitz, A, Fedorov, A, Sauvaud, JA, Larson, D, Galvin, A, Acuna, M & Luhmann, J 2009, 'On the temporal variability of the “strahl” and its relationship with solar wind characteristics: STEREO SWEA observations', Solar Physics, vol. 259, no. 1, pp. 311-321. https://doi.org/10.1007/s11207-009-9402-1

APA

Louarn, P., Dieval, C., Genot, V., Lavraud, B., Opitz, A., Fedorov, A., Sauvaud, J. A., Larson, D., Galvin, A., Acuna, M., & Luhmann, J. (2009). On the temporal variability of the “strahl” and its relationship with solar wind characteristics: STEREO SWEA observations. Solar Physics, 259(1), 311-321. https://doi.org/10.1007/s11207-009-9402-1

Vancouver

Louarn P, Dieval C, Genot V, Lavraud B, Opitz A, Fedorov A et al. On the temporal variability of the “strahl” and its relationship with solar wind characteristics: STEREO SWEA observations. Solar Physics. 2009 Jul 7;259(1):311-321. Epub 2009 Jul 7. doi: 10.1007/s11207-009-9402-1

Author

Louarn, Philippe ; Dieval, Catherine ; Genot, Vincent et al. / On the temporal variability of the “strahl” and its relationship with solar wind characteristics : STEREO SWEA observations. In: Solar Physics. 2009 ; Vol. 259, No. 1. pp. 311-321.

Bibtex

@article{3cdba092f8d04604873a0174f43a7f97,
title = "On the temporal variability of the “strahl” and its relationship with solar wind characteristics: STEREO SWEA observations",
abstract = "The “strahl” is a specific population of the solar wind, constituted by strongly field aligned electrons flowing away from the Sun, with energies >60 eV. Using the Solar Wind Electron Analyzer (SWEA) onboard STEREO, we investigate the short time scale fluctuations of this population. It is shown that its phase space density (PSD) at times presents fluctuations larger than 50% at scales of the order of minutes and less. The fluctuations are particularly strong for periods of a few tens of hours in high-speed streams, following the crossing of the corotating interaction region, when the strahl is also the most collimated in pitch angle. The amplitude of the fluctuations tends to decrease in conjunction with a broadening in pitch angle. Generally, the strongly fluctuating strahl is observed when the magnetic field is also highly perturbed. That SWEA is able to perform a very rapid 3D analysis at a given energy is essential since it can be demonstrated that the observed magnetic turbulence can only marginally perturb the PSD measurements.",
author = "Philippe Louarn and Catherine Dieval and Vincent Genot and Benoit Lavraud and Andrea Opitz and Andrei Fedorov and Sauvaud, {Jean Andre} and D. Larson and A. Galvin and M. Acuna and Janet Luhmann",
year = "2009",
month = jul,
day = "7",
doi = "10.1007/s11207-009-9402-1",
language = "English",
volume = "259",
pages = "311--321",
journal = "Solar Physics",
issn = "0038-0938",
publisher = "Springer Netherlands",
number = "1",

}

RIS

TY - JOUR

T1 - On the temporal variability of the “strahl” and its relationship with solar wind characteristics

T2 - STEREO SWEA observations

AU - Louarn, Philippe

AU - Dieval, Catherine

AU - Genot, Vincent

AU - Lavraud, Benoit

AU - Opitz, Andrea

AU - Fedorov, Andrei

AU - Sauvaud, Jean Andre

AU - Larson, D.

AU - Galvin, A.

AU - Acuna, M.

AU - Luhmann, Janet

PY - 2009/7/7

Y1 - 2009/7/7

N2 - The “strahl” is a specific population of the solar wind, constituted by strongly field aligned electrons flowing away from the Sun, with energies >60 eV. Using the Solar Wind Electron Analyzer (SWEA) onboard STEREO, we investigate the short time scale fluctuations of this population. It is shown that its phase space density (PSD) at times presents fluctuations larger than 50% at scales of the order of minutes and less. The fluctuations are particularly strong for periods of a few tens of hours in high-speed streams, following the crossing of the corotating interaction region, when the strahl is also the most collimated in pitch angle. The amplitude of the fluctuations tends to decrease in conjunction with a broadening in pitch angle. Generally, the strongly fluctuating strahl is observed when the magnetic field is also highly perturbed. That SWEA is able to perform a very rapid 3D analysis at a given energy is essential since it can be demonstrated that the observed magnetic turbulence can only marginally perturb the PSD measurements.

AB - The “strahl” is a specific population of the solar wind, constituted by strongly field aligned electrons flowing away from the Sun, with energies >60 eV. Using the Solar Wind Electron Analyzer (SWEA) onboard STEREO, we investigate the short time scale fluctuations of this population. It is shown that its phase space density (PSD) at times presents fluctuations larger than 50% at scales of the order of minutes and less. The fluctuations are particularly strong for periods of a few tens of hours in high-speed streams, following the crossing of the corotating interaction region, when the strahl is also the most collimated in pitch angle. The amplitude of the fluctuations tends to decrease in conjunction with a broadening in pitch angle. Generally, the strongly fluctuating strahl is observed when the magnetic field is also highly perturbed. That SWEA is able to perform a very rapid 3D analysis at a given energy is essential since it can be demonstrated that the observed magnetic turbulence can only marginally perturb the PSD measurements.

U2 - 10.1007/s11207-009-9402-1

DO - 10.1007/s11207-009-9402-1

M3 - Journal article

VL - 259

SP - 311

EP - 321

JO - Solar Physics

JF - Solar Physics

SN - 0038-0938

IS - 1

ER -