Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models
We investigate the formation of the high-energy (<i>E</i> ∈ [20,600] keV) ion population in the earth's magnetotail. We collect statistics of 4 years of Interball / Tail observations (1995–1998) in the vicinity of the neutral plane in the magnetotail region (<i>X<...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2014-10-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/32/1233/2014/angeo-32-1233-2014.pdf |
| _version_ | 1817975780873863168 |
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| author | A. V. Artemyev I. Y. Vasko V. N. Lutsenko A. A. Petrukovich |
| author_facet | A. V. Artemyev I. Y. Vasko V. N. Lutsenko A. A. Petrukovich |
| author_sort | A. V. Artemyev |
| collection | DOAJ |
| description | We investigate the formation of the high-energy (<i>E</i> ∈ [20,600] keV) ion
population in the earth's magnetotail. We collect statistics of 4 years of
Interball / Tail observations (1995–1998) in the vicinity of the neutral plane in
the magnetotail region (<i>X</i> <-17 <i>R</i><sub>E</sub>, |<i>Y</i>| ≤ 20 <i>R</i><sub>E</sub>
in geocentric solar magnetospheric (GSM) system). We study the dependence of high-energy ion spectra on
the thermal-plasma parameters (the temperature <i>T<sub>i</sub></i> and the amplitude
of bulk velocity <i>v<sub>i</sub></i>) and on the magnetic-field component <i>B<sub>z</sub></i>. The
ion population in the energy range <i>E</i> ∈ [20,600] keV can be separated in
the thermal core and the power-law tail with the slope (index) ~ −4.5. Fluxes of the high-energy ion population increase with the growth
of <i>B<sub>z</sub></i>, <i>v<sub>i</sub></i> and especially <i>T<sub>i</sub></i>, but spectrum index seems to be
independent on these parameters. We have suggested that the high-energy ion
population is generated by small scale transient processes, rather than by
the global reconfiguration of the magnetotail. We have proposed the
relatively simple and general model of ion acceleration by transient bursts
of the electric field. This model describes the power-law energy spectra
and predicts typical energies of accelerated ions. |
| first_indexed | 2024-04-13T21:53:52Z |
| format | Article |
| id | doaj.art-873edb4a134043f2990450b329d33a18 |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-04-13T21:53:52Z |
| publishDate | 2014-10-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-873edb4a134043f2990450b329d33a182022-12-22T02:28:19ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762014-10-01321233124610.5194/angeo-32-1233-2014Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical modelsA. V. Artemyev0I. Y. Vasko1V. N. Lutsenko2A. A. Petrukovich3Space Research Institute, RAS, Moscow, RussiaSpace Research Institute, RAS, Moscow, RussiaSpace Research Institute, RAS, Moscow, RussiaSpace Research Institute, RAS, Moscow, RussiaWe investigate the formation of the high-energy (<i>E</i> ∈ [20,600] keV) ion population in the earth's magnetotail. We collect statistics of 4 years of Interball / Tail observations (1995–1998) in the vicinity of the neutral plane in the magnetotail region (<i>X</i> <-17 <i>R</i><sub>E</sub>, |<i>Y</i>| ≤ 20 <i>R</i><sub>E</sub> in geocentric solar magnetospheric (GSM) system). We study the dependence of high-energy ion spectra on the thermal-plasma parameters (the temperature <i>T<sub>i</sub></i> and the amplitude of bulk velocity <i>v<sub>i</sub></i>) and on the magnetic-field component <i>B<sub>z</sub></i>. The ion population in the energy range <i>E</i> ∈ [20,600] keV can be separated in the thermal core and the power-law tail with the slope (index) ~ −4.5. Fluxes of the high-energy ion population increase with the growth of <i>B<sub>z</sub></i>, <i>v<sub>i</sub></i> and especially <i>T<sub>i</sub></i>, but spectrum index seems to be independent on these parameters. We have suggested that the high-energy ion population is generated by small scale transient processes, rather than by the global reconfiguration of the magnetotail. We have proposed the relatively simple and general model of ion acceleration by transient bursts of the electric field. This model describes the power-law energy spectra and predicts typical energies of accelerated ions.https://www.ann-geophys.net/32/1233/2014/angeo-32-1233-2014.pdf |
| spellingShingle | A. V. Artemyev I. Y. Vasko V. N. Lutsenko A. A. Petrukovich Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models Annales Geophysicae |
| title | Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models |
| title_full | Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models |
| title_fullStr | Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models |
| title_full_unstemmed | Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models |
| title_short | Formation of the high-energy ion population in the earth's magnetotail: spacecraft observations and theoretical models |
| title_sort | formation of the high energy ion population in the earth s magnetotail spacecraft observations and theoretical models |
| url | https://www.ann-geophys.net/32/1233/2014/angeo-32-1233-2014.pdf |
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