caa a22 4500 445347430 CHVBK 20180317142833.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s11207-011-9797-3 doi (NATIONALLICENCE)springer-10.1007/s11207-011-9797-3 Large-Scale Variation of Solar Wind Electron Properties from Quasi-Thermal Noise Spectroscopy: Ulysses Measurements [Elektronische Daten] [G. Le Chat, K. Issautier, N. Meyer-Vernet, S. Hoang] The transport of energy in space plasmas, especially in the solar wind, is far from being understood. Measuring the temperature of the electrons and their non-thermal properties is essential to understand the transport properties in collisionless plasmas. Quasi-thermal noise spectroscopy is a reliable tool for measuring the electron temperature accurately since it is less sensitive to the spacecraft perturbations than particle detectors. We apply this method to Ulysses radio data obtained during the first pole-to-pole fast latitude scan in the high-speed solar wind, using a kappa function to describe the electron velocity distribution. We deduce the variations with heliocentric distance between 1.5 and 2.3AU in the fast solar wind at high latitude in terms of three fitting parameters: the electron density varies as n e∝R −1.96±0.08, the electron temperature as T e∝R −0.53±0.15, and the kappa index of the distribution remains constant at κ=2.0±0.2. These observations agree with the predictions of the exospheric theory. Springer Science+Business Media B.V., 2011 Plasma physics nationallicence Solar wind nationallicence Le Chat G. LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris Diderot, 5 Place Jules Janssen, 92195, Meudon, France aut Issautier K. LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris Diderot, 5 Place Jules Janssen, 92195, Meudon, France aut Meyer-Vernet N. LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris Diderot, 5 Place Jules Janssen, 92195, Meudon, France aut Hoang S. LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris Diderot, 5 Place Jules Janssen, 92195, Meudon, France aut Solar Physics Springer Netherlands 271/1-2(2011-07-01), 141-148 0038-0938 271:1-2<141 2011 271 11207 https://doi.org/10.1007/s11207-011-9797-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-011-9797-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Le Chat G. LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris Diderot, 5 Place Jules Janssen, 92195, Meudon, France aut NATIONALLICENCE 700 1- Issautier K. LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris Diderot, 5 Place Jules Janssen, 92195, Meudon, France aut NATIONALLICENCE 700 1- Meyer-Vernet N. LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris Diderot, 5 Place Jules Janssen, 92195, Meudon, France aut NATIONALLICENCE 700 1- Hoang S. LESIA, Observatoire de Paris, CNRS, UPMC, Université Paris Diderot, 5 Place Jules Janssen, 92195, Meudon, France aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 271/1-2(2011-07-01), 141-148 0038-0938 271:1-2<141 2011 271 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer