Die Balloons!
Nein. Ist "
Der Ballon"...
Anyway, is there any way to calculate windspeed at various altitudes from distance, or does one have to relay on wind patterns from previous measurements?
Edit:
I am unclear if Google's high attitude BalLOONs had engines, but they seem to mainly rely on altitude control for navigation, and balloons in their swarm stayed a float for up to half a year at time. Has this been improved upon?
There's a general corpus of knowledge about both trends and (as things change) likely conditions at any given time. Nicely callibrated with the 'dumb' balloons, and how they've tracked themselves. The 60k feet level of the 'original' balloon is apparently rather sedate, wind-wise compared to the 30-40k ft altitude of the rather more volatile and changable polar jet-streams. And we've hear mention of propellors identified (by observation, and possibly by recovered wreckage) that could be enough for station-keeping (altitude control might be by active inflation/deflation, and/or perhaps vertical propulsion) to loiter, or take advantage of the right conveyor-belt of air to get elsewhere (eventually!).
I don't think it's much of a dark art. Even if it's not entirely a concrete science yet, capable of definitive and fully-scheduled flight-plans. (For China to have "lost control" of their devices would require a communication blackout between home-base and their craft, or a failure of the active platform systems, and I get the impression that data has been observed flowing freely, and a non-passive behaviour in key ways that would be hard to accomplish whilst under only problematic operation.
Without a specific (classified-level) insight into what the US actually thinks they have found out (or the Chinese
know for definite), even assuming a wide range of reality-to-announcement distortions one can probably assume it's a sufficiently competent attempt to at least
try the technology out, followed by the necessary (knee-jerk?) countermeasures being rolled out under the sudden public scrutiny that also happened.