Results 31 to 40 of about 2,155,828 (298)

Solar wind test of the de Broglie-Proca's massive photon with Cluster multi-spacecraft data [PDF]

, 2016
Our understanding of the universe at large and small scales relies largely on electromagnetic observations. As photons are the messengers, fundamental physics has a concern in testing their properties, including the absence of mass.
Retino, Alessandro, Spallicci, Alessandro D. A. M., Vaivads, Andris   +2 more
core   +6 more sources

Conjugate observations of quasiperiodic emissions by the Cluster, Van Allen Probes, and THEMIS spacecraft [PDF]

, 2016
We present results of a detailed analysis of two electromagnetic wave events observed in the inner magnetosphere at frequencies of a few kilohertz, which exhibit a quasiperiodic (QP) time modulation of the wave intensity.
F. Němec, G. Hospodarsky, J. Pickett, O. Santolík, W. Kurth, C. Kletzing   +5 more
semanticscholar   +2 more sources

Transients in oxygen outflow above the polar cap as observed by the Cluster spacecraft [PDF]

Annales Geophysicae, 2008
Oxygen ion outflow associated with the cusp and cleft give rise to persistent oxygen ion beams which can be observed over the polar cap. For high altitude spacecraft such as Cluster these beams are often observed for several hours on each occasion.
H. Nilsson, M. Waara, O. Marghitu, M. Yamauchi, R. Lundin, H. Rème, J. Sauvaud, I. Dandouras, E. Lucek, L. Kistler, B. Klecker, C. Carlson, M. Bavassano-Cattaneo, A. Korth   +13 more
semanticscholar   +6 more sources

Solitary waves observed in the auroral zone: the Cluster multi-spacecraft perspective [PDF]

Nonlinear Processes in Geophysics, 2004
Abstract. We report on recent measurements of solitary waves made by the Wideband Plasma Wave Receiver located on each of the four Cluster spacecraft at 4.5-6.5RE (well above the auroral acceleration region) as they cross field lines that map to the auroral zones.
J. S. Pickett, S. W. Kahler, Li‐Jen Chen, R. L. Huff, O. Santolı́k, Y. V. Khotyaintsev, P. M. E. Décréau, D. Winningham, R. A. Frahm, M. L. Goldstein, G. S. Lakhina, B. T. Tsurutani, B. Lavraud, D. A. Gurnett, M. André, A. N. Fazakerley, A. Balogh, H. Rème   +17 more
openalex   +11 more sources

Solitary potential structures observed in the magnetosheath by the Cluster spacecraft [PDF]

Nonlinear Processes in Geophysics, 2003
Abstract. Bipolar pulses of ~ 25-100 µs in duration have been observed in the wave electric field data obtained by the Wideband plasma wave instrument on the Cluster spacecraft in the dayside magnetosheath. These pulses are similar in almost all respects to those observed on several spacecraft over the last few years.
J. S. Pickett, J. D. Menietti, D. A. Gurnett, B. T. Tsurutani, P. M. Kintner, E. Klatt, A. Balogh   +6 more
openalex   +7 more sources

Research on dynamic path planning algorithm of spacecraft cluster based on cooperative particle swarm algorithm

Xibei Gongye Daxue Xuebao, 2021
In order to solve the problem of path planning for the spacecraft cluster to reach the dynamic target point under the premise of considering obstacle avoidance.
Zhang Zhen, Fang Qun, Song Jinfeng, Zhang Xiuwei, Zhu Zhanxia   +4 more
doaj   +1 more source

Cluster observations of a complex high-altitude cusp passage during highly variable IMF [PDF]

Annales Geophysicae, 2004
On 26 February 2001, the Cluster spacecraft were outbound over the Northern Hemisphere, at approximately 12:00 MLT, approaching the magnetosheath through the high-altitude (and exterior) cusp region.
M. G. G. T. Taylor, M. G. G. T. Taylor, M. W. Dunlop, B. Lavraud, B. Lavraud, A. Vontrat-Reberac, C. J. Owen, P. Décréau, P. Trávnícek, R. C. Elphic, R. H. W. Friedel, J. P. Dewhurst, Y. Wang, A. Fazakerley, A. Balogh, H. Rème, P. W. Daly   +16 more
doaj   +1 more source

Four point measurements of electrons using PEACE in the high-altitude cusp [PDF]

Annales Geophysicae, 2001
We present examples of electron measurements from the PEACE instruments on the Cluster spacecraft in the high-latitude, high-altitude region of the Earth’s magnetosphere.
M. G. G. T. Taylor, A. Fazakerley, I. C. Krauklis, C. J. Owen, P. Travnicek, P. Travnicek, M. Dunlop, P. Carter, A. J. Coates, S. Szita, G. Watson, R. J. Wilson   +11 more
doaj   +1 more source

The spacecraft wake: Interference with electric field observations and a possibility to detect cold ions [PDF]

Journal of Geophysical Research: Space Physics (2021) , 126, 2021JA029493, 2021
Wakes behind spacecraft caused by supersonic drifting positive ions are common in plasmas and disturb in situ measurements. We review the impact of wakes on observations by the Electric Field and Wave double-probe instruments on the Cluster satellites.
arxiv   +1 more source

Path Planning of Spacecraft Cluster Orbit Reconstruction Based on ALPIO [PDF]

Remote Sensing, 2022
An adaptive learning pigeon-inspired optimization based on mutation disturbance (ALPIO) is proposed for solving the problems of fuel consumption and threat avoidance in spacecraft cluster orbit reconstruction. First, considering the constraints of maintaining a safe distance between adjacent spacecraft within the spacecraft cluster and of avoiding ...
Bing Hua, Guang Yang, Yunhua Wu, Zhiming Chen   +3 more
openalex   +3 more sources