Satellite
Using high altitude airships or long range weather balloons rather than going into orbit!
Maintain position around a zone of gps co-ordinates, could be used as a system of emergency communications e.g. disaster zone, within 2 or 3 hours you could have it up and it would cover a fair area for perhaps photography or communications
There should be little air movement above the jet stream, so it won't drift (confirmation? See Bellow)
Perhaps use compressed air as propulsion to maintain position (though would be a limiting fuel)
obviously solar panels - due to the height they would be far more efficient then on the surface
Perhaps use normal balloon to provide the lift to get the payload/satellite into position
Due to the gradual lost of He from the standard balloons perhaps use a metallic balloon or have a helium canister onboard to refill to maintain altitude. The other alternative is to have ballast (such as water of compressed air) which can then be vented/dropped to maintain altitude
+ About JetStreams External Link
+ Jet Streams Forecast
MIT - External Link
California Weather (includes global data) - External Link