Very nice to read other people's observations! Thank you, everybody. I saw silvery-white ball lightning from my 7th story window a few years ago. It swooped, t

Very nice to read other people's observations! Thank you, everybody. I saw silvery-white ball lightning from my 7th story window a few years ago. It swooped, turned sharply and touched down maybe 200 meters away. It was a very bright, constant light against a cloudless blue sky in the middle of the day, moving at a constant speed. The best explanation I have for it is decay products of cosmic rays, resulting in plasma soliton. My estimate of the wattage and energy of its light output would mean it wasn't from a source in our solar system. I would think that if the source wasn't our sun then events like these would be very easily seen at night, and that my Northern latitude's long dark winters would de-bias opportunities to observe. Meanwhile if the source was our sun, then I would assume observations would correlate with sunspot activity.