35 research outputs found
Possible influence of seismic activity on the propagation of anomalous whistlers recorded in space
No full text
A Magnetometer For The Solar Orbiter Mission
No full textAuthors: - C.M. Carr, T.S. Horbury, A. Balogh, S.D. Bale, W. Baumjohann, B. Bavassano, A. Breen, D. Burgess, P.J. Cargill, N. Crooker, G. Erdõs, L. Fletcher, R.J. Forsyth, J. Giacalone, K.-H. Glassmeier, J. T. Hoeksema, M.L. Goldstein, M. Lockwood, W. Magnes, M. Maksimovic, E. Marsch, W. H. Matthaeus, N. Murphy, V. M. Nakariakov, J.R.-Pacheco, J.-L. Pincon, P. Riley, C. T. Russell, S. J. Schwartz, A. Szabo, M. Thompson, R. Vainio, M. Velli, S. Vennerstrom , R. Walsh, R. Wimmer-Schweingruber, G. ZankProceedings of The Second Solar Orbiter Workshop, Noordwijk, NetherlandsThe magnetometer is a key instrument to the Solar Orbiter mission. The magnetic field is a fundamental parameter in any plasma: a precise and accurate measurement of the field is essential for understanding almost all aspects of plasma dynamics such as shocks and stream-stream interactions. Many of Solar Orbiter's mission goals are focussed around the links between the Sun and space. A combination of in situ measurements by the magnetometer, remote measurements of solar magnetic fields and global modelling is required to determine this link and hence how the Sun affects interplanetary space. The magnetic field is typically one of the most precisely measured plasma parameters and is therefore the most commonly used measurement for studies of waves, turbulence and other small scale phenomena. It is also related to the coronal magnetic field which cannot be measured directly. Accurate knowledge of the magnetic field is essential for the calculation of fundamental plasma parameters such as the plasma beta, Alfvén speed and gyroperiod. We describe here the objectives and context of magnetic field measurements on Solar Orbiter and an instrument that fulfils those objectives as defined by the scientific requirements for the mission.https://adsabs.harvard.edu/full/2007ESASP.641E..41
Electron acceleration above thunderclouds
No full textThe acceleration of electrons results in observable electromagnetic waves which can be used for remote sensing. Here, we make use of ~4 Hz–66 MHz radio waves emitted by two consecutive intense positive lightning discharges to investigate their impact on the atmosphere above a thundercloud. It is found that the first positive lightning discharge initiates a sprite where electrons are accelerated during the exponential growth and branching of the sprite streamers. This preconditioned plasma above the thundercloud is subsequently exposed to a second positive lightning discharge associated with a bouncing-wave discharge. This discharge process causes a re-brightening of the existing sprite streamers above the thundercloud and initiates a subsequent relativistic electron beam
The Second International Symposium on Tilapia in Aquaculture
No full textProceedings of the symposium held in 1987 in Bangkok, Thailand, by tilapia scientists to discuss strategies for future research and development in the tilapia industry worldwide. Contains 82 full papers, 17 poster abstracts and author and species indexes. The full papers were presented under 7 sessions: culture systems, management and production; pathology; genetics and reproduction; nutrition, physiology; biology and ecology; and economics and socioeconomics.Tilapia culture, Conferences
