Static dischargers have high electrical resistance, and work via corona discharge.
So if I understand correctly, what wicks do is limit the voltage that the aircraft builds up. But as the wick is ionizing the air around, I guess this voltage is rather high.
Do commercial, fixed-wing aircraft need any additional grounding method once on the ground, when the passengers are boarding/unboarding for example?. How it's done?
Related: This question is about grounding for hangar storage, and also explains grounding for refueling operations