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Next: The
Corotation Radius Up: ``Ecology''
of Magnetic Rotators Previous: The
Stopping Radius in
Apparently, the magnetic field of a star becomes significant only when
the stopping radius exceeds the radius of the star, 
. We take the Alfven radius 
for 
, since it is the smallest of the two quantities
and 
. Hence, we can estimate the lowest value of magnetic field of a star which
will influence the flow of matter
The case 
, 
is considered most frequently, and for this case we get the following numerical
estimations
or, equivalently,
Most presently observed NS have magnetic fields 
G and dipole moments
G cm 
, so the magnetic field must necessarily be taken into account when considering
interaction of matter with these stars.