Documentation: fix conversion factor for SI units. Add Gaussian one.

git-svn-id: http://svn.einsteintoolkit.org/cactus/EinsteinBase/HydroBase/trunk@49 57fe0bb3-ccba-405f-9b23-de0201f165b7

1 files changed, 9 insertions, 3 deletions

diff --git a/doc/documentation.tex b/doc/documentation.tex
index 51826e5..8ba001d 100644
--- a/doc/documentation.tex
+++ b/doc/documentation.tex
@@ -210,7 +210,9 @@ magnetic field:
   \\{}
   [T] & = & [L]\; / c
   \\{}
-  [B] & = & 1/[L]\; / \sqrt{\epsilon_0 G / c^2}
+  [B] & = & 1/[L]\; / \sqrt{\epsilon_0 G / c^2} \qquad (\mathrm{SI})
+  \\{}
+  [B] & = & c^2/[L]\; / \sqrt{G} \qquad \qquad (\mathrm{Gaussian})
 \end{eqnarray}
 
 Inserting the SI units into the above unit correspondences, 
@@ -220,10 +222,14 @@ we find the following conversion factors:
   \\{}
   [T] & = & 1\, M_{\mathrm{sun}} \equiv 4.92673\, \mathrm{\mu s}
   \\{}
-  [B] & = & 1\, \sqrt{\mu_0} /M_{\mathrm{sun}} \equiv 8.344956\cdot 10^{15}\, \mathrm{T}, 
+  [B] & = & 1\, \sqrt{\mu_0/4\pi} /M_{\mathrm{sun}} \equiv 2.355368\cdot 
+            10^{15}\, \mathrm{T},  \qquad (\mathrm{SI})
+  \\{}
+  [B] & = & 1\, M^{-1}_{\mathrm{sun}} \equiv 7.448329\cdot 10^{18}\, \mathrm{G}, 
+            \qquad \qquad \qquad (\mathrm{Gaussian})
 \end{eqnarray}
 where T (Tesla) is the magnetic field unit in SI, 
-$1\,\mathrm{T}=1\,\mathrm{N/(A\cdot m)}$, or in its cgs equivalent,
+$1\,\mathrm{T}=1\,\mathrm{N/(A\cdot m)}$, and G (Gauss) is its cgs equivalent,
 $1\,\mathrm{Tesla} = 10^4\,\mathrm{Gauss}$.