Temporal Evolution of the Solar-Wind Electron Core Density at Solar Minimum by Correlating SWEA Measurements from STEREO A and B

Autor: Iannis Dandouras, Paul J. Kellogg, Andrei Fedorov, R. Karrer, C. Briand, Peter Wurz, Benoit Lavraud, Christopher T. Russell, Andrea Opitz, Emmanuel Penou, Philippe Louarn, Davin Larson, D. W. Curtis, David M. Malaspina, P. Schroeder, Antoinette B. Galvin, J. A. Sauvaud, Pierre Henri, Janet G. Luhmann
Přispěvatelé: Centre d'étude spatiale des rayonnements (CESR), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Universität Bern [Bern] (UNIBE), Space Sciences Laboratory, University of California (SSL), Institute of Geophysics and Planetary Physics, University of California, Department of Physics and Astronomy, University of Minnesota, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Physique des plasmas, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, University of Colorado, Laboratory for Atmospheric and Space Physics (LASP), UNH Space Science Center [Durham] (SSC), University of New Hampshire (UNH)
Jazyk: angličtina
Rok vydání: 2010
Předmět:
Zdroj: Solar Physics
Solar Physics, 2010, 266, pp.369-377. ⟨10.1007/s11207-010-9613-5⟩
Opitz, A.; Sauvaud, J.-A.; Fedorov, A.; Wurz, P.; Luhmann, J. G.; Lavraud, B.; Russell, C. T.; Kellogg, P.; Briand, C.; Henri, P.; Malaspina, D. M.; Louarn, P.; Curtis, D. W.; Penou, E.; Karrer, R.; Galvin, A. B.; Larson, D. E.; Dandouras, I.; Schroeder, P. (2010). Temporal Evolution of the Solar-Wind Electron Core Density at Solar Minimum by Correlating SWEA Measurements from STEREO A and B. Solar physics, 266(2), pp. 369-377. Springer 10.1007/s11207-010-9613-5
Opitz, A.; Sauvaud, J.-A.; Fedorov, A.; Wurz, P.; Luhmann, J. G.; Lavraud, B.; et al.(2010). Temporal Evolution of the Solar-Wind Electron Core Density at Solar Minimum by Correlating SWEA Measurements from STEREO A and B. Solar Physics: A Journal for Solar and Solar-Stellar Research and the Study of Solar Terrestrial Physics, 266(2), pp 369-377. doi: 10.1007/s11207-010-9613-5. Retrieved from: http://www.escholarship.org/uc/item/242227m2
ISSN: 0038-0938
1573-093X
DOI: 10.1007/s11207-010-9613-5⟩
Popis: International audience; The twin STEREO spacecraft provide a unique tool to study the temporal evolution of the solar-wind properties in the ecliptic since their longitudinal separation increases with time. We derive the characteristic temporal variations at ˜ 1 AU between two different plasma parcels ejected from the same solar source by excluding the spatial variations from our datasets. As part of the onboard IMPACT instrument suite, the SWEA electron experiment provides the solar-wind electron core density at two different heliospheric vantage points. We analyze these density datasets between March and August 2007 and find typical solar minimum conditions. After adjusting for the theoretical time lag between the two spacecraft, we compare the two density datasets. We find that their correlation decreases as the time difference increases between two ejections. The correlation coefficient is about 0.80 for a time lag of a half day and 0.65 for two days. These correlation coefficients from the electron core density are somewhat lower than the ones from the proton bulk velocity obtained in an earlier study, though they are still high enough to consider the solar wind as persistent after two days. These quantitative results reflect the variability of the solar-wind properties in space and time, and they might serve as input for solar-wind models.
Databáze: OpenAIRE
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