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- W2989957382 abstract "Abstract We describe the interface between the outer heliosphere and the local interstellar medium (LISM) surrounding the Sun. The components of the inner LISM are the four partially ionized clouds (the Local Interstellar Cloud (LIC), G cloud, Blue cloud, and Aql cloud) that are in contact with the outer heliosphere, and ionized gas produced by EUV radiation primarily from ϵ CMa. We construct the three-dimensional shape of the LIC based on interstellar line absorption along 62 sightlines and show that in the directions of ϵ CMa, β CMa, and Sirius B the neutral hydrogen column density from the center of the LIC is a minimum. We call this region the “hydrogen hole.” In this direction, the presence of Blue cloud absorption and the absence of LIC absorption can be simply explained by the Blue cloud lying just outside the heliosphere. We propose that the outer edge of the Blue cloud is a Strömgren shell driven toward the heliosphere by high pressures in the H ii region. We find that the vectors of neutral and ionized helium flowing through the heliosphere are inconsistent with the LIC flow vector, and that the nearby intercloud gas is consistent with ionization by ϵ CMa and other stellar sources without requiring additional sources of ionization or million-degree plasma. In the upwind direction, the heliosphere is passing through an environment of several LISM clouds, which may explain the recent influx of interstellar grains containing 60 Fe from supernova ejecta measured in Antarctic snow." @default.
- W2989957382 created "2019-12-05" @default.
- W2989957382 creator A5045256513 @default.
- W2989957382 creator A5061713634 @default.
- W2989957382 creator A5083165380 @default.
- W2989957382 date "2019-11-18" @default.
- W2989957382 modified "2023-09-26" @default.
- W2989957382 title "The Interface between the Outer Heliosphere and the Inner Local ISM: Morphology of the Local Interstellar Cloud, Its Hydrogen Hole, Strömgren Shells, and <sup>60</sup>Fe Accretion*" @default.
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- W2989957382 doi "https://doi.org/10.3847/1538-4357/ab498a" @default.
- W2989957382 hasPublicationYear "2019" @default.
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