Battery turned out to be not suitable for such cold temperatures and operation was cutting out during the night.
On the second day balloon ruptured and descended.
Payload weight - 13.4 grams.
Free lift - 4.1 grams.
Telemetry - 434.500 MHz, USB, DominoEX 16, vertical polarisation. Transmit during daytime only due to faulty battery.
Launch time 23 October 2013 19:15 UTC
Altitude in metres.
(C)2013 Leo Bodnar