UAV

NASA Earth science researchers last month traveled to Turrialba Volcano, near San Jose, Costa Rica, to fly a Dragon Eye unmanned aerial vehicle (UAV) -- a small electric aircraft equipped with cameras and sensors -- into the volcano’s sulfur dioxide plume and over its summit crater, to study Turrialba’s chemical environment. The project is designed to improve the remote-sensing capability of satellites and computer models of volcanic activity.

The study, called “In Situ Validation and Calibration of Remotely Sensed Volcanic Emission Data and Models,” launched 10 flights between March 11-14, 2013, into the volcanic plume and along the rim of the Turrialba summit crater approximately 10,500 feet above sea level (ASL). The launch site was located at 8,900 feet ASL, and flights ranged up to 12,500 feet ASL, more than 2,000 feet above the Turrialba summit. Project objectives included improving satellite data research products, such as maps of concentration and distribution of volcanic gases, and transport-pathway models of volcanic plumes.

During the research flights, the team coordinated its data gathering with the Advanced Spaceborne Thermal Emission and Reflection (ASTER) instrument on NASA’s Terra spacecraft, allowing scientists to compare sulfur dioxide concentration measurements from the satellite with measurements taken from within the plume. Scientists believe computer models derived from this study will contribute to safeguarding the National and International Airspace System, improve global climate predictions, and mitigate environmental hazards (e.g., sulfur dioxide volcanic smog or “vog”) for people who live around volcanoes.
A key factor of such models is the intensity and character of the volcanic activity located near the eruption vent. For instance, knowing the height of ash and gas concentrations, and temperatures over the vent during an eruption are important initial factors for any model that predicts the direction of the volcanic plume.

“It is very difficult to gather data from within volcanic eruption columns and plumes because updraft wind speeds are very high and high ash concentrations can quickly destroy aircraft engines,” said David Pieri, the project’s principal investigator and a research scientist at NASA’s Jet Propulsion Laboratory (JPL), Pasadena, Calif. “Such flight environments can be very dangerous to manned aircraft. Volcanic eruption plumes may stretch for miles from a summit vent, and detached ash clouds can drift hundreds to thousands of miles from an eruption site.