**Table 2:** Main sources of neutrals and ions in Saturn's inner magnetosphere. The choices for rings and satellites are explained in the text.
Source	r ( $R_{\rm S}$ ) ^a	Main ion	T (K)	${v_{\rm C}}$
		species^b		( ${\rm km~ s^{-1}}$ )
Saturn's	1.2	${\rm H^{+},~ H_{2}^{+}}$	400-	0
ionosphere	(north		800^d
	pole)
C-Ring	1.705	${\rm H^{+},~ N^{+},~ O^{+}}$ and	93^e	13.64
	(above)	water products^c
Enceladus	4.074	same as C-Ring	85^f	38.98
	(south
	pole)
Dione	6.576	same as C-Ring	87.15^g	32.08
E-Ring	7.665	${\rm H^{+},~ O^{+}}$ and	89.09^h	75.03
	(above)	water products
Rhea	9.552	same as E-Ring	76.15ⁱ	31.26

^a The distances are calculated through: $r=\sqrt{x^{2}+y^{2}+z^{2}}$ . Where x is the orbital distance measured from Saturn's center of mass, z is the distance perpendicular to the orbital plane and y completes the ortogonal coordinate system.
^b The masses are given in amu ( $1~{\rm amu}=1.66$ $\times$ $10^{-27}~{\rm kg}$ ): ${\rm H}=1.01$ ; H₂=2.02; H $_{2}{\rm O}=18.02$ ; $\rm N=14.01$ ; $\rm O=15.99$ ; ${\rm OH=17.01}$ .
^c Water products include $\rm H_{2}O^{+}$ and $\rm OH^{+}$ .
^d Atreya et al. (1986).
^e The brightness temperature has been determined by Murphy (1973). Recently Cassini has observed a temperature asymmetry between the unlit and lit sides of the rings (Spilker et al. 2006).
^f Spencer et al. (2006); Loeffler et al. (2006); Pontius & Hill (2006).
^g Soderblom & Johnson (1982).
^h It corresponds to the effective temperature considering that the E-Ring is mainly composed by icy-particles with an albedo of 0.05.
ⁱ It is the sunlit temperature on Rhea's surface (Murdin 2001).

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