Talk:Magnetopause

Magnetic moment definition in section "Estimating the standoff distance to the magnetopause"
Referring to the text: "Since the dipole magnetic field strength varies with distance as $$1/r^3$$ the magnetic field strength can be written as $$B(r)=B_0/r^3$$, where $$B_0$$ is the planet's magnetic moment, expressed in $$[T\cdot m^3]$$.

The units of $$[T\cdot m^{3}]$$ do not correspond to those for a dipole magnetic moment, which has units of $$[A m^2]$$ or [N m/T].

Chapter 17 of http://orca.phys.uvic.ca/~tatum/elmag/em17.pdf states that the units of [T\cdot m^{3}] "... often seen for “magnetic moment” is not dimensionally correct for magnetic moment..."

Also, the use of B(r) for magnetic field strength and use of $$B_0$$ for magnetic moment is confusing, $$\mathbf m$$ should be used instead to be consistent with Wikipedia page magnetic moment.

Alternative text would be "Since the Magnetic dipole field strength varies with distance as $$1/r^3$$ the magnetic field strength facing the sun (i.e., $$\theta =0$$) can be written as $$B(r)=\frac{\mu_0 \mathbf m}{4 \pi r^3}$$, where $$\mathbf m$$ is the planet's magnetic moment, expressed in $$[A m^2]$$."

In the subsequent equations, replace $$B_0$$ with $$\frac{\mu_0 \mathbf m}{4 \pi}$$.

I see that this is the first talk item for this page. If I don't see a response in a week or so, I will edit as outlined above to make this correction and align this text with magnetic moment. I will also add the citation mentioned above.

Would also like a citation for Note 1 for the 4x factor. Dmcdysan (talk) 01:24, 28 June 2022 (UTC)