Today a flight with both planes HALO and Falcon to southern Scandinavia was planned. On that flight we want to measure gravity waves. Gravity waves are periodic movements of the air, which lead to temperature and wind fluctuations. Gravity waves are excited in the troposphere for example through wind blowing over a mountain ridge. They transport energy from the troposphere into the higher stratosphere. The breaking waves deposit energy and drive global atmospheric circulations. Over southern Scandinava the polar jet is today blowing over the Norwegian Alps, where then mountain waves (one kind of gravity waves) are excited. The wave fronts are oriented parallel to the mountains and therefore in North-South direction. The flight pattern crosses the wave fronts on different altitudes several times to get a full picture of the wave.

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Yesterday there was a HALO flight towards the North Pole to measure polar stratospheric clouds. On that flight HALO followed the CALIPSO satellite track to compare the measurements. During this flight the ground crew had some hours off during the afternoon. This opportunity we took to visit the nearby village of Jukkasjärvi. The village is next to a big frozen lake. So we walked over the lake where we met some dog sledges and jetskis. Afterwards we could warm up with tea and coffee in a Sami tipi at an open fire place.

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After a successfull 9 hours flight HALO arrived at the Arena Artica in Kiruna yesterday. The flight was quite challenging for the aircraft and all the scientific instruments. Nevertheless lots of scientific interesting data has been accumulated. The instruments from the Research Center Jülich operated for the first time during this campaign without any problems.

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Two scientific flights were successfully performed in the last days. Now HALO will get its deserved Christmas break. Also the teams are in need for some days off. Due to unforeseen problems some of them had to work around the clock for the last two weeks. Everybody is relieved, that most of the instruments could earn valuable data. The GLORIA team from Jülich and Karlsruhe will get some homework to think about during the holidays as the instrument is unfortunately still not performing as expected. Nevertheless, we are confident to solve the problems for the campaign phase in Sweden.

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