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dc.contributor.authorOpher, Meraven_US
dc.contributor.authorLoeb, Abrahamen_US
dc.contributor.authorDrake, Jamesen_US
dc.contributor.authorToth, Gaboren_US
dc.date2020-02-04
dc.date.accessioned2020-05-11T17:51:31Z
dc.date.available2020-05-11T17:51:31Z
dc.date.issued2020-03-16
dc.identifier.citationMerav Opher, Abraham Loeb, James Drake, Gabor Toth. 2020. "A Small and Round Heliosphere Suggested by MHD Modeling of Pick-up Ions." Nature Astronomy, https://doi.org/10.1038/s41550-020-1036-0
dc.identifier.issn2397-3366
dc.identifier.urihttps://hdl.handle.net/2144/40769
dc.description.abstractAs the Sun moves through the surrounding partially-ionized medium, neutral hydrogen atoms penetrate the heliosphere, and through charge-exchange with the supersonic solar wind, create a population of hot pick-up ions (PUIs). Until recently, the consensus was that the shape of the heliosphere, is comet-like. The Termination Shock crossing by Voyager 2 (V2) demonstrated that the heliosheath (HS) (the region of shocked solar wind) pressure is dominated by PUIs; however, their impact on the global structure of the heliosphere has not been explored. Here we use a novel magnetohydrodynamic model that treats the PUIs as a separate fluid from the thermal component of the solar wind. The depletion of PUIs, due to charge exchange with the neutral H atoms of the ISM in the HS, cools the heliosphere, “deflating” it and leading to a narrower HS and a smaller and rounder shape, confirming the shape suggested by Cassini observations. The new model reproduces both the properties of the PUIs, based on the New Horizon, and solar wind ions, based on the V2 spacecraft observations, as well as the solar like magnetic field data outside the heliosphere at Voyager 1(V1) and V2.en_US
dc.language.isoen_US
dc.publisherNature Researchen_US
dc.relation.ispartofNature Astronomy
dc.titleA small and round heliosphere suggested by MHD modeling of pick-up ionsen_US
dc.typeArticleen_US
dc.description.versionAccepted manuscripten_US
dc.identifier.doi10.1038/s41550-020-1036-0
dc.description.embargo2020-09-16
pubs.elements-sourcemanual-entryen_US
pubs.notesEmbargo: 6 monthsen_US
pubs.notesEmbargo until publication. I don't know the publication date yeten_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Astronomyen_US
pubs.publication-statusPublisheden_US
dc.identifier.mycv538183


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