Taken during the Arctic campaign in support of the Earth Observation SMOS mission. Although designed to provide info on soil moisture & ocean salinity, SMOS can also be used to monitor thin sea-ice (complementing info from CryoSat). This is campaign using sensors on aircraft, hung from helicopter and instruments on a ship is to validate this potential.
Read more in the Campaign Earth blog: http://blogs.esa.int/campaignearth