In today's press release from NASA, the suggestion that Wesley and Go's 2-second flash might have been an atmospheric phenomenon, some kind of mega-lightning bolt. But it's a bit of a stretch.
"I consider that very, very unlikely," says planetary scientist Glenn Orton of NASA's Jet Propulsion Laboratory (JPL). "NASA spacecraft have seen lightning on Jupiter many times before, but only on the planet's nightside. This dayside event would have to be unimaginably more powerful than any previous bolt we've seen. Even Jupiter doesn't produce lightning that big."
So could it have been some kind of atmospheric anomaly on Earth that just happened to occur in the line of sight of Jupiter's disk? That's even more unlikely as Wesley and Go observed the same event, but at different locations on the planet, spaced thousands of kilometers apart.
That means we have to circle back and reconsider that it was an impact, but for some reason Jupiter has "covered up" any residue of the massive fireball.
One idea posited by NASA scientists is that the impact happened at the same latitude as one of Jupiter's recently disappeared atmospheric stripes. The South Equatorial Belt (SEB) has inexplicably vanished, possibly getting shrouded in a planet-wide cloud of high-altitude ammonia cloud. Could the same cloud be shrouding the site of last week's impact?