the following link
http://edition.cnn.com/2014/11/24/world/philae-lander-revival/index.html?hpt=wo_c2 has some other information
but also includes the potential sequence of revival of philae:
O'Rourke believes that if the lander comes back online there's a high chance it will survive until the comet's closest approach to the sun in August next year.
So how does Philae come back from the dead?
O'Rourke explained the sequence:
- If enough sunlight falls on the solar panel, Philae will reboot
- It then needs more energy to warm the batteries
- Once warmed, the batteries will start recharging
- When it has enough power Philae will try to contact the orbiting Rosetta -- for two minutes every 30 minutes.
- If it fails to make contact, Philae will power down the transmitter and try again 30 minutes later
The power it needs is tiny -- roughly equivalent to the output of two or three domestic AA batteries -- but it will be enough to restart the lander mission.