Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphere
Thanks to the evidence provided by the Cassini spacecraft mission, it is now established that Saturn’s magnetospheric plasma consists of various types of positive ions, as well as two distinct populations of electrons, at different temperatures. The electron population energy distributions are chara...
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2019
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| Online Access: | http://hdl.handle.net/20.500.12458/360 |
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| _version_ | 1857415062353870848 |
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| author | Kourakis, Ioannis |
| author2 | Singh, Manpreet Saini, N S |
| author2_role | author author |
| author_facet | Kourakis, Ioannis Singh, Manpreet Saini, N S |
| author_role | author |
| dc.creator.none.fl_str_mv | Kourakis, Ioannis Singh, Manpreet Saini, N S |
| dc.date.none.fl_str_mv | 2019-06-13T10:04:07Z 2019-06-13T10:04:07Z 2019 |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | Monthly Notices of the Royal Astronomical Society, vol 486(4), 2019, p 5504-5518 0035-8711 1365-2966 http://hdl.handle.net/20.500.12458/360 10.1093/mnras/stz1221 |
| dc.language.none.fl_str_mv | en |
| dc.relation.none.fl_str_mv | Monthly Notices of the Royal Astronomical Society 4 486 5504 5518 |
| dc.title.none.fl_str_mv | Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphere |
| dc.type.none.fl_str_mv | Controlled Vocabulary for Resource Type Genres::text::periodical::journal::contribution to journal::journal article |
| description | Thanks to the evidence provided by the Cassini spacecraft mission, it is now established that Saturn’s magnetospheric plasma consists of various types of positive ions, as well as two distinct populations of electrons, at different temperatures. The electron population energy distributions are characterized by long suprathermal tails and have been effectively modelled by kappa-type distributions. Plasma properties are known to vary along the radial direction. A strong magnetic field penetrates the magnetosphere, hence the plasma beta is small, β < 1 for radial distance < 15.2RS (where RS = 60 330 km is the Saturn’s radius). Motivated by these observations, we have investigated the conditions for existence and the dynamics of linear and non-linear kinetic Alfv´en waves (KAWs) in Saturn’s magnetosphere. We have considered a low-β (stronglymagnetized) plasma, comprising of positive ions and two electron populations (‘cold’ and ‘hot’) characterized by non-Maxwellian (kappa) distributions. In the small-amplitude regime, harmonic analysis leads to a linear dispersion relation bearing explicit dependence on the characteristics of the suprathermal components. In the nonlinear regime, large-amplitude stationary profile kinetic Alfv´en solitary wave solutions are obtained via a two-component pseudopotential method, associated with either positive or negative potential structures (pulses) propagating at sub- and super-Alfv´enic speeds, respectively. The effect of various intrinsic plasma configuration properties (hot-to-cold electron density and temperature ratio; superthermality indices κc and κh; plasma beta) as well as propagation parameters (pulse speed, direction of propagation) on the characteristics of KAW solitary waves are discussed |
| id | sorbonner_afb3611b1cb88bcf86c0a61313dbcb64 |
| identifier_str_mv | Monthly Notices of the Royal Astronomical Society, vol 486(4), 2019, p 5504-5518 0035-8711 1365-2966 10.1093/mnras/stz1221 |
| language_invalid_str_mv | en |
| network_acronym_str | sorbonner |
| network_name_str | Sorbonne University Abu Dhabi repository |
| oai_identifier_str | oai:depot.sorbonne.ae:20.500.12458/360 |
| publishDate | 2019 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| spelling | Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphereKourakis, IoannisSingh, ManpreetSaini, N SThanks to the evidence provided by the Cassini spacecraft mission, it is now established that Saturn’s magnetospheric plasma consists of various types of positive ions, as well as two distinct populations of electrons, at different temperatures. The electron population energy distributions are characterized by long suprathermal tails and have been effectively modelled by kappa-type distributions. Plasma properties are known to vary along the radial direction. A strong magnetic field penetrates the magnetosphere, hence the plasma beta is small, β < 1 for radial distance < 15.2RS (where RS = 60 330 km is the Saturn’s radius). Motivated by these observations, we have investigated the conditions for existence and the dynamics of linear and non-linear kinetic Alfv´en waves (KAWs) in Saturn’s magnetosphere. We have considered a low-β (stronglymagnetized) plasma, comprising of positive ions and two electron populations (‘cold’ and ‘hot’) characterized by non-Maxwellian (kappa) distributions. In the small-amplitude regime, harmonic analysis leads to a linear dispersion relation bearing explicit dependence on the characteristics of the suprathermal components. In the nonlinear regime, large-amplitude stationary profile kinetic Alfv´en solitary wave solutions are obtained via a two-component pseudopotential method, associated with either positive or negative potential structures (pulses) propagating at sub- and super-Alfv´enic speeds, respectively. The effect of various intrinsic plasma configuration properties (hot-to-cold electron density and temperature ratio; superthermality indices κc and κh; plasma beta) as well as propagation parameters (pulse speed, direction of propagation) on the characteristics of KAW solitary waves are discussed2019-06-13T10:04:07Z2019-06-13T10:04:07Z2019Controlled Vocabulary for Resource Type Genres::text::periodical::journal::contribution to journal::journal articleapplication/pdfMonthly Notices of the Royal Astronomical Society, vol 486(4), 2019, p 5504-55180035-87111365-2966http://hdl.handle.net/20.500.12458/36010.1093/mnras/stz1221enMonthly Notices of the Royal Astronomical Society448655045518oai:depot.sorbonne.ae:20.500.12458/3602023-12-05T06:07:34Z |
| spellingShingle | Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphere Kourakis, Ioannis |
| title | Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphere |
| title_full | Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphere |
| title_fullStr | Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphere |
| title_full_unstemmed | Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphere |
| title_short | Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphere |
| title_sort | Kinetic Alfvén solitary waves in a plasma with two-temperature superthermal electron populations: the case of Saturn’s magnetosphere |
| url | http://hdl.handle.net/20.500.12458/360 |