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Table 1
Estimates of pickup ion parameters in the coma and assumptions that are used to derive these parameters.
| Assumptions | Measured quantities (30 October 2014) |
Derived parameters | Values |
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| 1 nT solar wind magnetic field | VSW = 370 km s-1 | Gyroradius (H2O+) Gyroperiod (H2O+) | 7 × 104 km 1200 s |
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| 1 nT solar wind magnetic field perpendicular to VSW | VSW = 370 km s-1 | Solar wind convective electric field energy gain for an ion after 30 km propagation | 0.37 mV/m 11 eV |
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| Neutral gas outflow speed from comet = 0.7 km s-1 | Distance: Rosetta to comet nucleus = 30 km | Propagation time from comet to Rosetta (H2O, H2O+) | 43 s |
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| Neutral gas temperature between 200 and 1000 K | Neutral number density at Rosetta: 107 molecules cm-3 | Mean free path | ~70−300 km |
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