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Fig. 3


Overview of the observations by instruments on board the Rosetta spacecraft on 20 January 2015. a) Ion energy spectrum measured by RPC-ICA. The colour coded quantity is the differential particle flux summed over all viewing directions. The energy scale has been adjusted for Vsc and Voffset. b) Differential particle flux of hot water ions (9 eV ≲ E ≲ 23 eV when E is adjusted for offset and spacecraft potential) for the different sectors of the RPC-ICA instrument. c) Electron temperature observed by RPC-LAP. d) Magnitude of the magnetic flux density B seen by RPC-MAG. e) Neutral gas density measured by ROSINA-COPS. f) Angles between the coordinate axes of the spacecraft frame of reference and the direction to the nucleus of the comet. g) Power Spectral density of the current to Langmuir probe 1 in the frequency range 200 Hz <f ≤ 1450 Hz. h) Power Spectral density of the current to Langmuir probe 2 for 200 Hz <f ≤ 1450 Hz. Periods when the ROSINA-COPS measurements were affected by the spacecraft pointing are marked in grey at the bottom of panel e) and the top of panel f). The spikes in the neutral density at 03:54, 14:00, and 23:31 (shown in grey in panel e)) are due to wheel off-loading manoeuvres. The RPC-ICA instrument (panels a) and b)) was off during these manoeuvres.

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