http://www.ua.nws.noaa.gov/factsheet.htm
The answer is radiosonde. See the following link.
所有跟帖:
•
this is a professional answer
-用户名被占用了-
♂
(0 bytes)
()
02/23/2011 postreply
17:45:57
•
I doublt if there is an amateur answer
-shortstop-
♂
(222 bytes)
()
02/23/2011 postreply
18:16:24