The High Definition Earth Viewing (HDEV) experiment aboard the ISS was activated April 30, 2014. It is mounted on the External Payload Facility of the European Space Agency’s Columbus module. This experiment includes several commercial HD video cameras aimed at the earth which are enclosed in a pressurized and temperature controlled housing. Video from these cameras is transmitted back to earth and also streamed live on this channel. While the experiment is operational, views will typically sequence though the different cameras. Between camera switches, a gray and then black color slate will briefly appear. Since the ISS is in darkness during part of each orbit, the images will be dark at those times. During periods of loss of signal with the ground or when HDEV is not operating, a gray color slate or previously recorded video may be seen.
Analysis of this experiment will be conducted to assess the effects of the space environment on the equipment and video quality which may help decisions about cameras for future missions. High school students helped with the design of some of the HDEV components through the High Schools United with NASA to Create Hardware (HUNCH) program. Student teams will also help operate the experiment. To learn more about the HDEV experiment, visit here.
- The ISS orbits Earth every 92 minutes. If the screen is black (it’s not broken) the ISS is on the dark side of Earth where there is no light. The darkness will last for 46 minutes before entering daylight again.
- During the darkness you might notice spots of color flashing at times. This is called the South Atlantic Anomaly (SAA). It’s an area where the Earth’s inner Van Allen radiation belt comes closest to the Earth’s surface dipping down to an altitude of 200 km (124 mi).