Seasonal cusp radiation belt on dayside magnetosphere
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| Format: | Artículo científico |
| Langue: | en |
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Sociedade Brasileira de Física
2004
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| _version_ | 1876476502045884416 |
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| author | G.I. Pugacheva |
| author_facet | G.I. Pugacheva |
| contents | Seasonal cusp radiation belt on dayside magnetosphere G.I. Pugacheva A.A. Gusev U.B. Jayanthi N.J. Schuch K.T. Choque Física, Astronomía y Matemáticas The possibility of quasi-stable trapping of charged particles of hundreds keV to MeV energy on the frontsideEarth magnetosphere is explored in by numerical modeling of the single particle orbits in the geomagnetic fieldutilizing empirical Tsyganenko magnetic field model. Due to solar wind pressure the remote magnetic fieldlines on the frontside of the magnetosphere exhibit two minima in the geomagnetic field strength along the fieldline in high latitudes on the both sides of the equator. These minima may result in stable confinement structures,a kind of radiation belts, in the northern or/and the southern hemispheres, providing energetic particle trappingfor times from several minutes to duration of seasonal scale. Simulation of energetic proton orbits passingthrough the regions of the magnetic field minima with different disturbance level and the Earths tilt revealsconditions in which these trapped radiation zones could result. It is shown that the existence of the adiabaticconfinement zones strongly depends on the seasonal inclination of the Earths rotation axis. As a result thenorthern cusp confinement zone appears only in a summer solstice and similarly the southern cusp capturezone appears only in a winter solstice. In equinox time the confinement zones exist in both hemispheres in thedisturbed magnetospheric conditions, however, they are less pronounced. The zones are essentially restrictedto the sunlit magnetosphere. They form a kind of cusp radiation ring/belt, where a proton drifts with a periodof several minutes, conserving its 1st and the 2nd adiabatic invariants. The latitudinal width of the ring isvery thin, about 2-5 latitudinal degrees. The proton orbits passing through the off-equatorial field minimumopposite to those cusp belts reveal another interesting effect: a bound of the geomagnetic equatorial plane onthe day sector. These and other features of the confinement zones in the two minima off-equatorial magneticfield regions are discussed. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434729 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.4A Vol.34 |
| format | Artículo científico |
| id | redalyc_46434729 |
| institution | Redalyc |
| language | en |
| publishDate | 2004 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Seasonal cusp radiation belt on dayside magnetosphere G.I. Pugacheva Física, Astronomía y Matemáticas Seasonal cusp radiation belt on dayside magnetosphere G.I. Pugacheva A.A. Gusev U.B. Jayanthi N.J. Schuch K.T. Choque Física, Astronomía y Matemáticas The possibility of quasi-stable trapping of charged particles of hundreds keV to MeV energy on the frontsideEarth magnetosphere is explored in by numerical modeling of the single particle orbits in the geomagnetic fieldutilizing empirical Tsyganenko magnetic field model. Due to solar wind pressure the remote magnetic fieldlines on the frontside of the magnetosphere exhibit two minima in the geomagnetic field strength along the fieldline in high latitudes on the both sides of the equator. These minima may result in stable confinement structures,a kind of radiation belts, in the northern or/and the southern hemispheres, providing energetic particle trappingfor times from several minutes to duration of seasonal scale. Simulation of energetic proton orbits passingthrough the regions of the magnetic field minima with different disturbance level and the Earths tilt revealsconditions in which these trapped radiation zones could result. It is shown that the existence of the adiabaticconfinement zones strongly depends on the seasonal inclination of the Earths rotation axis. As a result thenorthern cusp confinement zone appears only in a summer solstice and similarly the southern cusp capturezone appears only in a winter solstice. In equinox time the confinement zones exist in both hemispheres in thedisturbed magnetospheric conditions, however, they are less pronounced. The zones are essentially restrictedto the sunlit magnetosphere. They form a kind of cusp radiation ring/belt, where a proton drifts with a periodof several minutes, conserving its 1st and the 2nd adiabatic invariants. The latitudinal width of the ring isvery thin, about 2-5 latitudinal degrees. The proton orbits passing through the off-equatorial field minimumopposite to those cusp belts reveal another interesting effect: a bound of the geomagnetic equatorial plane onthe day sector. These and other features of the confinement zones in the two minima off-equatorial magneticfield regions are discussed. 2004 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46434729 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.4A Vol.34 |
| title | Seasonal cusp radiation belt on dayside magnetosphere |
| topic | Física, Astronomía y Matemáticas |
| url | https://www.redalyc.org/articulo.oa?id=46434729 |