The safety analysis of an evolving software system has to consider the impact that changes might have on the software components, and to provide confidence that the risk is acceptable. If the impact of a change is not thoroughly analysed, accidents can occur as a result of faulty interactions between components, for example. However, the process of safety analysis can be enhanced if appropriate...

The emission and collection of current from satellites or rockets in the ionosphere is a process which, at equilibrium, requires a balance between inward and outward currents. In most active experiments in the ionosphere and magnetosphere, the emitted current exceeds the integrated thermal current by one or more orders of magnitude. The system response is typically for the emitted current to be...

The technique of particle correlation measures directly electron modulations that result from naturally occurring and actively stimulated wave-particle interactions in space plasmas. In the past this technique has been used for studies of beam-plasma interactions, caused by both natural auroral electron beams via sounding rockets and by artificially generated electron beams on Space Shuttle mis...

[1] We perform intermittency analyses on the electric field data obtained by the SIERRA sounding rocket in the auroral zone. The electric field fluctuations are broadband, covering the extremely low-frequency range with a power-law relation, similar to the type of fluctuations commonly observed at various altitudes of the auroral region. Our preliminary analyses of the data based on the techniq...

Extragalactic background light (EBL) anisotropy traces variations in the total production of photons over cosmic history and may contain faint, extended components missed in galaxy point-source surveys. Infrared EBL fluctuations have been attributed to primordial galaxies and black holes at the epoch of reionization (EOR) or, alternately, intrahalo light (IHL) from stars tidally stripped from t...

Abstract Stability and performance are crucial characteristics for aerospace vehicles. The ability to investigate the aerodynamics of rockets gives an insight into their stability before flight potential design enhancements. For past 13 years, rocketry Division within students’ space Association Warsaw University technology has been developing sounding different designs mission profiles. Two ha...

In safety-critical systems, software safety analysis aims to provide confidence that the risk associated with the software is acceptable. Accidents in safety-critical systems are usually associated with the occurrence of multiple failures in the system components, or with the lack of adequate error containment mechanisms. The process of safety analysis can be enhanced if the appropriate abstrac...

In this paper, reliability block diagram of a sounding rocket separation system is determined and also, FMEA analysis of its spring mechanism is performed. This system is based on the flexible linear shape charge crosssection system and a spring mechanism to accelerate separation. In this investigation, reliability block diagram of the separation system include mechanical and electrical mechani...

Electrofusion of evacuolated with vacuolated mesophyll protoplasts of Nicotiana tabacum was performed as part of the German Sounding Rocket Program (TEXUS 17, 1988). The results indicate a significant increase not only in the yield of 1:1 hybrids, but also in homo- and multifusion products. Hybrids obtained under microgravity have been shown to be viable to a higher degree with respect to their...

The Diffuse X-ray emission from the Local Galaxy (DXL) sounding rocket is a NASA approved mission with a scheduled first launch in December 2012. Its goal is to identify and separate the X-ray emission of the solar wind charge exchange (SWCX) from that of the local hot bubble (LHB) to improve our understanding of both. To separate the SWCX contribution from the LHB, DXL will use the SWCX signat...