Survey of Voyager plasma science ions at Jupiter: 1. Analysis method
When the Voyager 1 and 2 spacecraft fl ew through the Jovian system in March and July 1979, the Plasma Science instruments measured ions and electrons in the Io plasma torus and plasma sheet between 4.9 and 42 R J . The dominant ions in the Jovian magnetosphere comprise the fi rst few ionization sta...
| Main Authors: | , , |
|---|---|
| Other Authors: | |
| Format: | Article |
| Published: |
American Geophysical Union (AGU)
2019
|
| Online Access: | http://hdl.handle.net/1721.1/120927 |
| _version_ | 1811089078517497856 |
|---|---|
| author | Dougherty, L. P. Bodisch, K. M. Bagenal, Fran. |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Dougherty, L. P. Bodisch, K. M. Bagenal, Fran. |
| author_sort | Dougherty, L. P. |
| collection | MIT |
| description | When the Voyager 1 and 2 spacecraft fl ew through the Jovian system in March and July 1979, the Plasma Science instruments measured ions and electrons in the Io plasma torus and plasma sheet between 4.9 and 42 R J . The dominant ions in the Jovian magnetosphere comprise the fi rst few ionization states of atomic sulfur and oxygen. We present here an analysis of minor ion species H + ,Na + , and SO 2 + . Protons are 1 – 20% of the plasma between 5 and 30 R J with variable temperatures ranging by a factor of 10 warmer or colder than the heavy ions. We suggest that these protons, measured deep inside the magnetosphere, are consistent with a source from the ionosphere of ~1.5 – 7.5 × 10 27 protons s 1 (2.5 – 13 kg/s). Na + ions are detected between 5 and 40 R J at an abundance of 1 to 10%, produced by the ionization of the extended neutral cloud emanating from Io that has been observed since 1974. SO 2 + ions are detected between 5.31 and 5.07 R J at an abundance of 0.1 – 0.6%. These ions clearly come from the plasma interaction with Io ’ s atmosphere, but the exact processes whereby atmospheric molecules escape Io and end up as ions well inside Io ’ s orbit are not clear. |
| first_indexed | 2024-09-23T14:13:26Z |
| format | Article |
| id | mit-1721.1/120927 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T14:13:26Z |
| publishDate | 2019 |
| publisher | American Geophysical Union (AGU) |
| record_format | dspace |
| spelling | mit-1721.1/1209272022-10-01T19:54:50Z Survey of Voyager plasma science ions at Jupiter: 1. Analysis method Dougherty, L. P. Bodisch, K. M. Bagenal, Fran. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Bagenal, Fran. When the Voyager 1 and 2 spacecraft fl ew through the Jovian system in March and July 1979, the Plasma Science instruments measured ions and electrons in the Io plasma torus and plasma sheet between 4.9 and 42 R J . The dominant ions in the Jovian magnetosphere comprise the fi rst few ionization states of atomic sulfur and oxygen. We present here an analysis of minor ion species H + ,Na + , and SO 2 + . Protons are 1 – 20% of the plasma between 5 and 30 R J with variable temperatures ranging by a factor of 10 warmer or colder than the heavy ions. We suggest that these protons, measured deep inside the magnetosphere, are consistent with a source from the ionosphere of ~1.5 – 7.5 × 10 27 protons s 1 (2.5 – 13 kg/s). Na + ions are detected between 5 and 40 R J at an abundance of 1 to 10%, produced by the ionization of the extended neutral cloud emanating from Io that has been observed since 1974. SO 2 + ions are detected between 5.31 and 5.07 R J at an abundance of 0.1 – 0.6%. These ions clearly come from the plasma interaction with Io ’ s atmosphere, but the exact processes whereby atmospheric molecules escape Io and end up as ions well inside Io ’ s orbit are not clear. United States. National Aeronautics and Space Administration. Jupiter Data Analysis Program (NNX09AE03G) Juno Mission (U.S.) (SWRI subcontract 699050X) 2019-03-12T17:15:46Z 2019-03-12T17:15:46Z 2017-08 2017-03 2019-03-07T18:46:46Z Article http://purl.org/eprint/type/JournalArticle 21699380 http://hdl.handle.net/1721.1/120927 Bagenal, F., L. P. Dougherty, K. M. Bodisch, J. D. Richardson, and J. M. Belcher. “Survey of Voyager Plasma Science Ions at Jupiter: 1. Analysis Method.” Journal of Geophysical Research: Space Physics 122, no. 8 (August 2017): 8241–8256. http://dx.doi.org/10.1002/2016JA023797 Journal of Geophysical Research: Space Physics Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Geophysical Union (AGU) other univ website |
| spellingShingle | Dougherty, L. P. Bodisch, K. M. Bagenal, Fran. Survey of Voyager plasma science ions at Jupiter: 1. Analysis method |
| title | Survey of Voyager plasma science ions at Jupiter: 1. Analysis method |
| title_full | Survey of Voyager plasma science ions at Jupiter: 1. Analysis method |
| title_fullStr | Survey of Voyager plasma science ions at Jupiter: 1. Analysis method |
| title_full_unstemmed | Survey of Voyager plasma science ions at Jupiter: 1. Analysis method |
| title_short | Survey of Voyager plasma science ions at Jupiter: 1. Analysis method |
| title_sort | survey of voyager plasma science ions at jupiter 1 analysis method |
| url | http://hdl.handle.net/1721.1/120927 |
| work_keys_str_mv | AT doughertylp surveyofvoyagerplasmascienceionsatjupiter1analysismethod AT bodischkm surveyofvoyagerplasmascienceionsatjupiter1analysismethod AT bagenalfran surveyofvoyagerplasmascienceionsatjupiter1analysismethod |