In my answer to What would it feel like to be in a Martian dust storm? I assert that Martian dust storms would be best avoided, and as one of the reasons (besides carrying corrosive chemicals like perchlorate salts, hydrogen peroxide, tiny and sharp dust particles being strongly ablative, decreased visibility and so on) I also mention triboelectric charge that such dust storms could cause on the surface of the suit and potentially lead to catastrophic discharge tearing the fabric of the suit.
But there's another possible concern which I also mention, and that is lightnings on Mars. To me, that we directly detected them in 2009 isn't really surprising, since the Martian regolith is covered with rust, iron oxides which gives it its reddish surface tint that the planet is famous for. This got me thinking however, that if Martian dust storms carry sufficient electric potential that its triboelectricity has been suggested as the leading candidate for generating hydrogen peroxide on Mars that was first detected in 2003, such lightnings cannot be rare and far between, and the overall electric charge capacity of these dust storms must be pretty impressive despite their relatively low kinetic strength.
Which brings me to my question. Assuming asking for maximum strength electric discharge events (read: lightnings) would be rather frivolous if we barely detected any (not too surprising considering reduced visibility), perhaps more fruitful would be asking about their average charge capacity that they carry;
Has any orbiter been measuring Martian dust storms capacitance, or can their strength perhaps be established indirectly by measuring its effect on atmospheric chemistry, e.g. local changes in the amount of atmospheric hydrogen peroxide before, during and after the storm?
There are other possible ways of establishing this, including laboratory tests on simulated Martian regolith in Mars-analog atmospheric pressure environment, or even computed models, so I don't want to limit answers to a handful of options that I mentioned to establish this. Any additional insight is welcome, but please provide references in your answers.