Table 2.

Ion Composition Near the Positions of the Most Intense Planetary Energetic Ion Spectra

Planet	Earth	Jupiter	Saturn	Uranus	Neptune
L	3 to 5	7.1 to 9.5	8.4 to 9.5	6.5	9.4
Elec. Den.	130 to 1100	120 to 900	6 to 10	∽1	∽0.1
Species	Fractions	Fractions	Fractions	Fractions	Fractions
H+	0.78	0.025	0.16	0.995	0.6
H2+			0.025	0.005	0.005
He+	0.2
O2+		0.17
S3+		0.068
N+					0.395
O+	0.02	0.27	0.38
S2+		0.18
OH+			0.2
H2O+			0.2
H3O+			0.04
S+		0.28
References	Horwitz et al.[1986]	Belcher [1983]	Thomsen et al. [2010]; D. C. Hamilton contribution to Mauk et al. [2009]	Krimigis et al. [1986]; Belcher et al. [1991]	Richardson et al. [1995]