pint.derived_quantities.pulsar_B

pint.derived_quantities.pulsar_B(f: ~astropy.units.quantity.Quantity, fdot: ~astropy.units.quantity.Quantity, I: ~astropy.units.quantity.Quantity = <Quantity 1.e+45 cm2 g>, R: ~astropy.units.quantity.Quantity = <Quantity 10. km>) -> Unit("G")

Compute pulsar surface magnetic field

Return the pulsar surface magnetic field strength given the spin frequency f and frequency derivative fdot.

Parameters:

• f (astropy.units.Quantity) – pulsar frequency

• fdot (astropy.units.Quantity) – frequency derivative \(\dot f\)

• I (astropy.units.Quantity, optional) – pulsar moment of inertia, default of 1e45 g*cm**2

• R (astropy.units.Quantity, optional) – pulsar radius, default of 10 km

Returns:

B – pulsar dipole magnetic field in u.G

Return type:

astropy.units.Quantity

Raises:

• astropy.units.UnitsError – If the input data are not appropriate quantities

• TypeError – If the input data are not quantities

Notes

Calculates \(B=\sqrt{\frac{3\,I\,c^3}{8\pi^2\,R^6}\times\frac{-\dot{f}}{f^3}}\)