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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 ...
Published by: Solar Physics Published on: 11/2018
YEAR: 2018   DOI: 10.1007/s11207-018-1377-3
The Solar Probe Plus ( SPP) mission will explore the Sun\textquoterights corona and innermost solar wind starting in 2018. The spacecraft will also come close to a number of Mercury-crossing asteroids with perihelia less than 0.3 AU. At small heliocentric distances, these objects may begin to lose mass, thus becoming "active asteroids" with comet-like comae or tails. This paper assembles a database of 97 known Mercury-crossing asteroids that may be encountered by SPP, and it presents estimates of their time-dependent visi ...
Published by: Earth, Moon, and Planets Published on: 11/2016
YEAR: 2016   DOI: 10.1007/s11038-016-9490-5