Changes between Version 2 and Version 3 of AstroBearProjects/MagnetizedClumps


Ignore:
Timestamp:
07/10/11 18:20:18 (14 years ago)
Author:
Shule Li
Comment:

—

Legend:

Unmodified
Added
Removed
Modified

  • AstroBearProjects/MagnetizedClumps

    v2 v3  
    105105[[Image(http://www.pas.rochester.edu/~shuleli/simplecloud.png, 40%)]][[BR]][[BR]]
    106106
     107The force free field configurations with spherical shape is not as simple as the cylindrical case due to the nature of the poloidal-toroidal combination. The result is that the magnetic potential psi as we described before needs to have an angular dependence in order to have a non-zero field. The cut below shows a spherical shaped field by combining the first order spherical bessel functions and Legendre polynomials. The field pressure is very strong (at 40 computational units comparing to the thermal pressure of 0.2, with beta value of 0.005) yet the field can stay stable. [[BR]]
     108[[Image(http://www.pas.rochester.edu/~shuleli/sphericalfield.png, 40%)]][[BR]][[BR]]
     109
     110
    107111The stability with self gravity and thermal diffusion of such a cloud might be interesting. Since we can put in a Bonner Ebert cloud which is also force free. The cloud would be unstable to radial pokes because of anisotropic thermal instabilities. As we know, the thermal instability will reorient the field and in this case, the force free property can not be maintained, I guess...[[BR]][[BR]]
    108112