Plasma Pressures in the Heliosheath From Cassini ENA and Voyager 2 Measurements: Validation by the Voyager 2 Heliopause Crossing
Abstract We report “ground truth,” 28‐ to 3,500‐keV in situ ion and 5.2‐ to 55‐keV remotely sensed ENA measurements from Voyager 2/Low Energy Charged Particle detector and Cassini/Ion and Neutral Camera, respectively, that assess the components of the ion pressure in the heliosheath. In this process...
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| Format: | Article |
| Language: | English |
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Wiley
2019-07-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2019GL083924 |
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| author | Konstantinos Dialynas Stamatios M. Krimigis Robert B. Decker Donald G. Mitchell |
| author_facet | Konstantinos Dialynas Stamatios M. Krimigis Robert B. Decker Donald G. Mitchell |
| author_sort | Konstantinos Dialynas |
| collection | DOAJ |
| description | Abstract We report “ground truth,” 28‐ to 3,500‐keV in situ ion and 5.2‐ to 55‐keV remotely sensed ENA measurements from Voyager 2/Low Energy Charged Particle detector and Cassini/Ion and Neutral Camera, respectively, that assess the components of the ion pressure in the heliosheath. In this process, we predict an interstellar neutral hydrogen density of ∼0.12 cm−3 and an interstellar magnetic field strength of ∼0.5‐nT upstream of the heliopause in the direction of V2, that is, consistent with the measured magnetic field and neutral density measurements at Voyager 1 from August 2012, when the spacecraft entered interstellar space, to date. Further, this analysis results in an estimated heliopause crossing by V2 of ∼119 AU, as observed, suggesting that the parameters deduced from the pressure analysis are valid. The shape of the >5.2‐keV ion energy spectra play a critical role toward determining the pressure balance and acceleration mechanisms inside the heliosheath. |
| format | Article |
| id | doaj-art-2ea1768b81e645b7a8afdcdf926d66e8 |
| institution | OA Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2019-07-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-2ea1768b81e645b7a8afdcdf926d66e82025-08-20T02:33:55ZengWileyGeophysical Research Letters0094-82761944-80072019-07-0146147911791910.1029/2019GL083924Plasma Pressures in the Heliosheath From Cassini ENA and Voyager 2 Measurements: Validation by the Voyager 2 Heliopause CrossingKonstantinos Dialynas0Stamatios M. Krimigis1Robert B. Decker2Donald G. Mitchell3Office of Space Research and Technology Academy of Athens Athens GreeceOffice of Space Research and Technology Academy of Athens Athens GreeceApplied Physics Laboratory The Johns Hopkins University Laurel MD USAApplied Physics Laboratory The Johns Hopkins University Laurel MD USAAbstract We report “ground truth,” 28‐ to 3,500‐keV in situ ion and 5.2‐ to 55‐keV remotely sensed ENA measurements from Voyager 2/Low Energy Charged Particle detector and Cassini/Ion and Neutral Camera, respectively, that assess the components of the ion pressure in the heliosheath. In this process, we predict an interstellar neutral hydrogen density of ∼0.12 cm−3 and an interstellar magnetic field strength of ∼0.5‐nT upstream of the heliopause in the direction of V2, that is, consistent with the measured magnetic field and neutral density measurements at Voyager 1 from August 2012, when the spacecraft entered interstellar space, to date. Further, this analysis results in an estimated heliopause crossing by V2 of ∼119 AU, as observed, suggesting that the parameters deduced from the pressure analysis are valid. The shape of the >5.2‐keV ion energy spectra play a critical role toward determining the pressure balance and acceleration mechanisms inside the heliosheath.https://doi.org/10.1029/2019GL083924heliosphereheliosheathheliopauseenergetic neutral atomsCassiniVoyager |
| spellingShingle | Konstantinos Dialynas Stamatios M. Krimigis Robert B. Decker Donald G. Mitchell Plasma Pressures in the Heliosheath From Cassini ENA and Voyager 2 Measurements: Validation by the Voyager 2 Heliopause Crossing Geophysical Research Letters heliosphere heliosheath heliopause energetic neutral atoms Cassini Voyager |
| title | Plasma Pressures in the Heliosheath From Cassini ENA and Voyager 2 Measurements: Validation by the Voyager 2 Heliopause Crossing |
| title_full | Plasma Pressures in the Heliosheath From Cassini ENA and Voyager 2 Measurements: Validation by the Voyager 2 Heliopause Crossing |
| title_fullStr | Plasma Pressures in the Heliosheath From Cassini ENA and Voyager 2 Measurements: Validation by the Voyager 2 Heliopause Crossing |
| title_full_unstemmed | Plasma Pressures in the Heliosheath From Cassini ENA and Voyager 2 Measurements: Validation by the Voyager 2 Heliopause Crossing |
| title_short | Plasma Pressures in the Heliosheath From Cassini ENA and Voyager 2 Measurements: Validation by the Voyager 2 Heliopause Crossing |
| title_sort | plasma pressures in the heliosheath from cassini ena and voyager 2 measurements validation by the voyager 2 heliopause crossing |
| topic | heliosphere heliosheath heliopause energetic neutral atoms Cassini Voyager |
| url | https://doi.org/10.1029/2019GL083924 |
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