Cosmic rays cut-off in approach of dipole and homogeneous field for Jupiter system
Abstract
The strong Jovian magnetic field results in cosmic rays cut-off by the dipole magnetic field up to GV rigidity. The magnetospheric magnetic field in the inner magnetosphere inside of the Ganymed orbit strongly distorbed by the equatorial magnetodisk field. In the area close to the equatorial plane the magnetodisk field is directed opposite to the dipolemagnetic field, however in the outer magnetosphere the magnetodisk field reverses its direction. This results in enhancement of the effective dipole magnetic moment compared to planetary Jupiter dipole moment up to 3 times (see [1]). We studied the rigidity cut-off in Jupiter system at Io, Europe and Ganymede orbits. In our work we have used a generalization of the Stormer analysis for a dipole field by introducing additionally a homogenous magnetic field directed northward (opposite to planetary magnetic field). Such an analysis gives us the possibility to estimate the contribution of solar event particles to the total radiation dose a spacecraft in the Jovian system is exposed to. Also we can estimate the escape rate of energetic particles from trapped radiation zone to interplanetary space. In this process Jupiter serves as a source of energetic particles in Solar system.
- Publication:
-
European Planetary Science Congress 2012
- Pub Date:
- September 2012
- Bibcode:
- 2012epsc.conf..846L