A new inner heliosphere proton parameter dataset from the Helios mission

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Title: A new inner heliosphere proton parameter dataset from the Helios mission
Authors: Stansby, D
Salem, C
Matteini, L
Horbury, T
Item Type: Journal Article
Abstract: In the near future, Parker Solar Probe and Solar Orbiter will provide the first comprehensive in-situ measurements of the solar wind in the inner heliosphere since the Helios mission in the 1970s. We describe a reprocessing of the original Helios ion distribution functions to provide reliable and reproducible data to characterise the proton core population of the solar wind in the inner heliosphere. A systematic fitting of bi-Maxwellian distribution functions was performed to the raw Helios ion distribution function data to extract the proton core number density, velocity, and temperatures parallel and perpendicular to the magnetic field. We present radial trends of these derived proton parameters, forming a benchmark to which new measurements in the inner heliosphere will be compared. The new dataset has been made openly available for other researchers to use, along with the source code used to generate it.
Issue Date: 26-Nov-2018
Date of Acceptance: 7-Nov-2018
ISSN: 0038-0938
Publisher: Springer Verlag
Journal / Book Title: Solar Physics
Volume: 293
Issue: 11
Copyright Statement: © 2018 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Keywords: Science & Technology
Physical Sciences
Astronomy & Astrophysics
Solar wind
Inner heliosphere
Solar wind protons
0201 Astronomical And Space Sciences
Publication Status: Published
Open Access location:
Article Number: 155
Online Publication Date: 2018-11-26
Appears in Collections:Space and Atmospheric Physics
Faculty of Natural Sciences

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