Ion Hole Equilibrium and Dynamics in One Dimension
Electrostatic solitary waves with negative potential (ion holes) are analyzed theoretically using a generalization of the treatment recently developed for slow electron holes. It is shown that an often-cited criterion for their existence is mistaken and they can in fact exist for a wide range of...
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2023
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| Online Access: | https://hdl.handle.net/1721.1/150444 |
| _version_ | 1826216721184194560 |
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| author | Hutchinson, IH |
| author2 | Massachusetts Institute of Technology. Plasma Science and Fusion Center |
| author_facet | Massachusetts Institute of Technology. Plasma Science and Fusion Center Hutchinson, IH |
| author_sort | Hutchinson, IH |
| collection | MIT |
| description | Electrostatic solitary waves with negative potential (ion holes) are analyzed
theoretically using a generalization of the treatment recently developed for
slow electron holes. It is shown that an often-cited criterion for their
existence is mistaken and they can in fact exist for a wide range of ion to
electron temperature ratios. Shifts of the hole velocity $v_h$ relative to the
ion distributions systematically decrease the permitted hole depths, which
become extremely small by $v_h/v_{ti}\sim 2$. Ion holes are usually unstably
accelerated by electron reflection forces which are calculated numerically and
analytically for the resulting asymmetric potential structure. The timescale of
this acceleration is proportional to the ion plasma period, and generally
longer than the ion bounce time in the potential well. Thus, ion holes behave
like approximately rigid entities and even when unstable can survive much
longer than the typical transit time of a satellite, so as to be observable. |
| first_indexed | 2024-09-23T16:52:02Z |
| format | Article |
| id | mit-1721.1/150444 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:52:02Z |
| publishDate | 2023 |
| record_format | dspace |
| spelling | mit-1721.1/1504442024-01-19T19:05:05Z Ion Hole Equilibrium and Dynamics in One Dimension Hutchinson, IH Massachusetts Institute of Technology. Plasma Science and Fusion Center Electrostatic solitary waves with negative potential (ion holes) are analyzed theoretically using a generalization of the treatment recently developed for slow electron holes. It is shown that an often-cited criterion for their existence is mistaken and they can in fact exist for a wide range of ion to electron temperature ratios. Shifts of the hole velocity $v_h$ relative to the ion distributions systematically decrease the permitted hole depths, which become extremely small by $v_h/v_{ti}\sim 2$. Ion holes are usually unstably accelerated by electron reflection forces which are calculated numerically and analytically for the resulting asymmetric potential structure. The timescale of this acceleration is proportional to the ion plasma period, and generally longer than the ion bounce time in the potential well. Thus, ion holes behave like approximately rigid entities and even when unstable can survive much longer than the typical transit time of a satellite, so as to be observable. 2023-04-06T18:09:10Z 2023-04-06T18:09:10Z 2023-01-14 2023-04-06T18:01:36Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/150444 Hutchinson, IH. 2023. "Ion Hole Equilibrium and Dynamics in One Dimension." en Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf American Institute of Physics (AIP) |
| spellingShingle | Hutchinson, IH Ion Hole Equilibrium and Dynamics in One Dimension |
| title | Ion Hole Equilibrium and Dynamics in One Dimension |
| title_full | Ion Hole Equilibrium and Dynamics in One Dimension |
| title_fullStr | Ion Hole Equilibrium and Dynamics in One Dimension |
| title_full_unstemmed | Ion Hole Equilibrium and Dynamics in One Dimension |
| title_short | Ion Hole Equilibrium and Dynamics in One Dimension |
| title_sort | ion hole equilibrium and dynamics in one dimension |
| url | https://hdl.handle.net/1721.1/150444 |
| work_keys_str_mv | AT hutchinsonih ionholeequilibriumanddynamicsinonedimension |