MICROSCOPE On-ground and In-orbit Calibration

The MICROSCOPE mission, to be launched in 2011, will perform the test of the universality of free fall (Equivalence Principle) to an accuracy of 10^?15. The payload consists of two sensors, each controlling the free fall of a pair of test masses: the first for the test of the Equivalence Principle (titanium/platinum), the second for performance verification (platinum/platinum). The capability to detect a faint violation signal of the EP test is conditioned upon the rejection of disturbances arising from the coupling and misalignments of the instrument vectorial outputs. Therefore the performance of the mission depends on the success of the series of calibration operations which are planned during the satellite life in orbit. These operations involve forced motion of the masses with respect to the satellite. Specific data processing tools and simulations are integral parts of the calibration and performance enhancement process, as are the tests operated on ground at the ZARM drop tower. The presentation will focus on the current status of the MICROSCOPE payload, the rationale for the in-orbit calibrations, the data processing operations and the tests performed at the ZARM drop tower.     

The radiation controlled balloon (RACOON)

The RACOON concept permits the flight of large, low-cost polyethylene balloons for several weeks at stratospheric altitudes without ballast. The theory of operations is described. The RACOON balloon ascends each morning and descends at night. This movement of 15 to 20 km in altitude provides an ideal platform for vertical soundings and sampling measurements in the stratosphere. Results of a number of globe-circling flights are presented.     

Planetary and gravity waves in the mesosphere and lower thermosphere

Planetary and gravity waves contribute significantly to the variability of atmospheric parameters in the middle atmosphere. In the mesosphere and lower thermosphere the wave fluctuations are sufficiently large to often mask the prevailing or mean state of the atmosphere. This review summarizes current knowledge about the motion, temperature and density fields associated with both large and small scale waves and stresses improved understanding that has come from recent ground based, rocket and satellite investigations.     

Book reviews

Space Science Reviews -     

Recent Advancements and Motivations of Simulated Pluto Experiments

This review of Pluto laboratory research presents some of the recent advancements and motivations in our understanding enabled by experimental simulations, the need for experiments to facilitate models, and predictions for future laboratory work. The spacecraft New Horizons at Pluto has given a large amount of scientific data already rising to preliminary results, spanning from the geology to the atmosphere. Different ice mixtures have now been detected, with the main components being nitrogen, methane, and carbon monoxide. Varying geology and atmospheric hazes, however, gives us several questions that need to be addressed to further our understanding. Our review summarizes the complexity of Pluto, the motivations and importance of laboratory simulations critical to understanding the low temperature and pressure environments of icy bodies such as Pluto, and the variability of instrumentation, challenges for research, and how simulations and modeling are complimentary.     

What's the health of the Business Aviation marketplace heading into Q4?

正Depending upon the data,the so-called Business Aviation'recovery'has now been underway for the past nine to 10 years,through ups and downs,and twists and turns.Good news:new business jet sales have been quite robust through the first half of 2019,with OEMs recording book-to-bills above 1.0 and finally beginning to replenish backlogs,which had been slowly declining over the     

European thoughts on the new US defence strategy: A major repositioning in a difficult budgetary context

The USA adopted a new defence strategy in 2012 which responds to the changing geopolitical landscape and straightened economic circumstances. The emphasis is on leaner, more flexible and diversified operations, while priority areas have shifted from Europe to the Asia-Pacific (in acknowledgement of China's growing military might) and the Middle East. This will have consequences for Europe, which is now expected to take a greater share of the strategic burden. The major developments in the strategy – such as eschewing the pursuit of lengthy engagements on more than one front, and using the military to complement diplomatic and economic initiatives – are discussed. Europe is urged to respond by maintaining its national strategic and industrial autonomy, including in access to space and missile defence.