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Solar wind Alfv\ enicity during solar cycle 23 and 24. Perspective for future observations with Parker Solar Probe and Solar Orbiter
Context. Alfv\ enic fluctuations are ubiquitous features observed in solar wind, especially in the inner heliosphere. However, strong Alfv\ enic fluctuations are recovered in the near-Earth solar wind too, mainly in fast streams, but also in some cases in slow wind intervals, as highlighted in recent studies. \ Aims: The present study focuses on a statistical comparison between different phases of solar cycles 23 and 24 with regard to the Alfv\ enic content of solar wind fluctuations. Particular attention is devoted to the A ...
Amicis, R.; Alielden, K.; Perrone, D.; Bruno, R.; Telloni, D.; Raines, J.~M.; Lepri, S.~T.; Zhao, L.;
Published by: \aap Published on: oct
YEAR: 2021   DOI: 10.1051/0004-6361/202140600
Parker Data Used; plasmas; Sun: heliosphere; Solar wind; turbulence; methods: data analysis; Interplanetary medium
Objectively Determining States of the Solar Wind Using Machine Learning
Conclusively determining the states of the solar wind will aid in tracing the origins of those states to the Sun, and in the process help to find the wind\textquoterights origin and acceleration mechanism(s). Prior studies have characterized the various states of the wind, making lists that are only partially based on objective criteria; different approaches obtain substantially different results. To uncover the unbiased states of the solar wind, we use "k-means clustering"\textemdashan unsupervised machine learning metho ...
Roberts, Aaron; Karimabadi, Homa; Sipes, Tamara; Ko, Yuan-Kuen; Lepri, Susan;
Published by: The Astrophysical Journal Published on: 02/2020
YEAR: 2020   DOI: 10.3847/1538-4357/ab5a7a
Coronal electron temperature in the protracted solar minimum, the cycle 24 mini maximum, and over centuries
Schwadron, N.~A.; Goelzer, M.~L.; Smith, C.~W.; Kasper, J.~C.; Korreck, K.; Leamon, R.~J.; Lepri, S.~T.; Maruca, B.~A.; McComas, D.; Steven, M.~L.;
Published by: Journal of Geophysical Research (Space Physics) Published on: 03/2014
YEAR: 2014   DOI: 10.1002/2013JA019397