To transfer HALO back to Oberpfaffenhofen it takes two 6 h flights from Manaus, with a stopover at Sal in the Cape Verde Islands. The take-off at Manaus was planned for 8:00 o’clock in the morning on October 3. Our handling agency arranged the exit documents and a flag of the Amazonian district for a last picture of HALO in Manaus. Since we had no Brazilian scientist and no military observer aboard, altogether six scientists from Germany and three crew members were operating the aircraft. Without the Brazilian observer on board, we were not allowed to take data above Brazilian territory. Our colleagues in Manaus gave us last instructions on how to turn on the instruments once we left Brazilian air space. They gave us a warm farewell and wished a good journey and received a pile of postcards that we had missed to send.
The second part of the transfer started the next day with a hectic preparation of the instruments. HALO was parked outside; fortunately we had no storm or rain that night. We had only about 1 h before take-off to turn on the instruments and get things running before sampling another dust event near Sal. Take-off was at 8:00 o’clock. We ascended to FL100 but had to realize that the dust cloud was below us. Thus our radiation measurements collected some valuable data while flying above the dust cloud.
Left: Parked outside in Sal