ROBEX Part 3: Hammering for science

Mount Etna is very close to being a substitute Moon for the planetary researchers of the ROBEX project – it is here that they find volcanic basalt in quantities similar to those of the constituents of the lunar soil. In addition, the Sicilian volcano is the only place in Europe that experiences earthquakes at a depth of up to 600 kilometres. Mount Etna is like the Moon in this respect as well, as Earth's lunar companion experiences most earthquakes 700 to 1100 kilometres below the surface. "Etna is the only place in Europe where we can measure earthquakes at a similar depth," says planetary researcher Martin Knapmeyer.

Two experiments are to be conducted on the mountain; in the active measurements, the scientists use a hammer to strike the surface and seismometers to measure the transmission of the sound waves through the ground. The volcanic ash of 2001 rests on top of a more solid layer in Piano del Lago, so waves that take different routes through the surface material arrive at the seismometers at different times, providing information on the structures below the ground. The passive experiment uses four measurement stations to listen to the processes inside the volcano. read more

ROBEX Part 2: Lander on a trolley

500. 350. 80. On Friday, these numbers set the rhythm. Weighing in at 500 kilograms, the RODIN lander will be taken 350 metres from its current location, 80 metres downhill. The lander was initially kept near base camp – the perfect location for carrying out repairs following its transit to Sicily and for the first tests and connection to the control room on Mount Etna. To conduct the actual 'Moon mission', the RODIN lander will be on the Piano del Lago.

The plain – located between Torre del Filosofo and La Montagnola crater – was once covered with meltwater. This changed when Mount Etna erupted in 2001; ash was spewn all over the plain and the Laghetto crater was formed. An ash blanket now covers a solidified layer of lava. It is its thickness that DLR planetary researchers want to measure. To do this, the heavy lander needs to be moved. Once lifted onto a trolley with rollers, the lander was able to start its descent down the slope. read more

ROBEX Part 1: Mission in the lava landscape

A journey to the Moon is an arduous one, even if this 'Moon' is located here on Earth, 2600 metres above sea level, directly on Mount Etna.

A heavy transporter winds its way slowly and laboriously through the narrow, serpentine roads above Catania in Sicily to arrive at our lunar destination. The landscape becomes increasingly black as the team from the HGF Alliance ROBEX (Robotic Exploration under Extreme Conditions) approaches its temporary work location. Everyone clambers into all-terrain vehicles at Rifugio Sapienza to cover the last stretch to base camp, which is located right in the middle of a lava field. There, one lander, two rovers and several seismometers have been prepared for this one and a half week 'mission'. For the next four weeks, the on-site containers will be home to the almost 50 team members from DLR, AWI, the University of Würzburg and the Technical University of Kaiserslautern, where they will function as multipurpose laboratories, workshops and offices. read more

DLR audio – The Sound of Science

Science is simulating, measuring, and evaluating data in order to gather knowledge. On an elementary level, however, science is a description of human experience: touching, observing, and listening. Helicopter rotors make a very particular sound; satellites send beacon signals from outer space; wind tunnels also produce a characteristic soundscape.

One of the latest audio recordings in the SoundCloud archives comes from the School_Lab in Göttingen, and it is a real treat for stereo enthusiasts. read more

Double anniversary for SOFIA

SOFIA during take-off for the Functional Check Flight on 26 April 2007

The coming week will bring two occasions to celebrate with SOFIA. Just yesterday was the 40th anniversary of the virgin flight by SOFIA's 'flying base' on 25 April 1977: operating under the registration N536PA, the Boeing 747 SP flew for the former airline PAN AM, mainly on long-haul routes to Asia or South America. There are images of the aircraft in its original livery and a detailed history of the 21441-306 airframe.

And it was 10 years ago today, on 26 April 2007, that the Boeing took off for the first time with the SOFIA observatory on board, following extensive modification of the aircraft and the installation of a telescope and door system. read more

Video: The flying observatory SOFIA

The flying observatory SOFIA is rolled into the NASA hangar in Palmdale.

How does the flying observatory SOFIA work? What is infrared astronomy? What sets SOFIA apart from other space observatories, and what happens on a typical day in the air?

read more

How researchers are using the latest Earth observation data – Part three

Latest change detection map from TerraSAR-X

Part three of this blog series looks into our dynamic Earth: How is it changing, at what speed and with what consequences? The satellite missions TerraSAR-X and TanDEM-X offer new perspectives, which inspire scientists to take new approaches. read more

How researchers use the latest Earth observation data – Part two

Elevation model of the mangrove forest region in the Sundarbans

In the second part of the series on the TerraSAR-X and TanDEM-X Science Meeting in Oberpfaffenhofen, we present further applications for satellite data. This time, for example, biomass is determined with the help of 'Earth observers from space'. Up until Thursday, 20 October 2016, international scientists will use the congress to show their research results on satellite-based Earth observation and to exchange ideas.

High above the swamp

Wet, warm and salty – the perfect habitat for mangroves. These tropical trees only feel at home in seawater or the brackish water of rivers. Together with other water-loving plants and shrubs, they can spread across entire forests or swamps. They offer protection against land loss through coastal erosion along seaboards and act as buffers to block storm surges and tsunamis. Around the world, mangrove forests account for an expanse of roughly 150,000 square kilometres. This equates to an enormous quantity of biomass – plant constituents that act as natural carbon reservoirs and that influence the climate. But exactly how much biomass is stored in these forests? And what about the inaccessible areas? read more

How researchers use the latest Earth observation data - Part one

Elevation model of coastal area

Researchers from across the globe are in Oberpfaffenhofen for the TerraSAR-X and TanDEM-X Science Meeting. For four days, from 17 to 20 October 2016, they have the opportunity to present their results from the data acquired by the two Earth observation satellite missions and exchange information. Here, approximately 200 presentations give an overview of the latest research in satellite-based Earth observation. The radar data are used in various scientific fields, from climate research to geosciences to forestry, infrastructure planning and remote sensing methodology.

Covering the Science Meeting, the Space Blog presents some of the work presented. The short examples provided outline how the data of the German radar satellites support researchers worldwide. read more

A day in the tropical sky

The apron of the hangar – the Falcon is ready for more measurements

It is the middle of the night on the coast of West Africa. A team of sleepy aircraft technicians and atmospheric researchers exit the hotel lobby. The humidity hits them like a brick wall – it is already 25 degrees Celsius outside. Their departure for Gnassingbé Eyadéma Airport is scheduled at four AM sharp. The first motorcycles of the day thunder past the walls of the hotel complex. Today’s take-off is set for 09:30. But the chauffeurs are late – again.

At 04:30, two cars drive up along the beach promenade through the still quiet streets of Lomé, the capital city of Togo.

En route to the hangar via Boulevard Du Mono.

Twenty minutes later, the group reaches their destination – a small hangar next to the international airport. Waiting for them, ready for use, is the Falcon 20E , a very reliable member of DLR’s fleet of research aircraft. read more