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Table 2

Plasma parameters for three different regions divided into two hemispheres corresponding to the sign of zCSE.

Region Close to nucleus May–June Dayside excursion
zCSE >0 <0 >0 <0 >0 <0
10 90 10 90 10 90 10 90 10 90 10 90
N (cm−3) 61 130 210 97 220 500 52 87 140 42 53 120 58 100 170 54 110 200
NH+/N 10−5 2.3 9.0 63 1.4 5.5 19 7.3 32 181 13 110 410 8.2 43 300 6.2 65 360
vlow (km/s) 0.9 1.8 9.1 1.0 2.0 7.6 1.2 5.2 19 0.5 3.3 9.0 3.1 9.3 20 2.6 8.2 19
vhigh (km/s) 5.6 10 14 5.7 10 15 6.2 10 19 5.2 10 17 6.3 12 20 6.8 12 20
TH 1D (eV) 4.4 18 51 4.2 14 39 5.1 19 73 3.7 7.0 27 2.7 11 44 2.5 14 59
H+ rg 34 100 240 24 98 260 5.5 37 145 15 26 103 2.9 8.0 28 2.6 9.6 32
H2O+ rg 81 220 670 110 210 670 40 160 360 160 210 500 30 100 190 37 120 290
B (nT) 8.7 23 40 6.9 22 39 15 31 50 14 37 46 24 43 74 18 37 58
σB (nT) 2.0 5.1 9.7 1.9 4.8 9.3 5.8 10 15 2.7 4.8 8.6 6.7 12 23 5.3 9.9 33
Plasma β 0.5 1.6 7.7 0.7 3.4 20.0 0.4 1.0 4.5 0.2 0.6 5.8 0.2 0.8 3.7 0.3 1.3 7.3
vA (km/s) 4 10 19 3 7 14 8 17 34 6 27 36 11 23 49 7 18 38
vMS (km/s) 10 14 22 10 13 17 13 20 36 12 30 37 16 26 51 13 24 40
Mach vA 0.4 1.0 2.2 0.6 1.3 4.1 0.2 0.8 1.2 0.2 0.5 1.2 0.2 0.6 1.3 0.2 0.7 1.7
Mach vMS 0.3 0.7 1.1 0.5 0.8 1.2 0.2 0.6 0.9 0.2 0.4 0.7 0.2 0.5 0.9 0.2 0.6 0.9

Notes. N is the total plasma density. NH+ is the proton density. B is the magnitude of the magnetic field. The Alfvén velocity, vA, and magnetosonic speed, vMS, were calculated using the LAP-MIP density and assuming water ions only. The total plasma speed is given as a lower, vlow, and upper, vhigh, estimate, as described in the text. The plasma beta was calculated by summing kinetic and thermal pressure estimates for particle pressure and assuming a temperature of 10 eV for electrons; see text for details. Values are given for the 10th percentile, median (bold), and 90th percentile.

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