A5068489519- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Spacecraft Design and Technology
- Planetary Science and Exploration
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- solar cell performance optimization
- Spacecraft and Cryogenic Technologies
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- Offshore Engineering and Technologies
- Atmospheric and Environmental Gas Dynamics
- Underwater Acoustics Research
- Earthquake Detection and Analysis
- Satellite Communication Systems
- Atmospheric aerosols and clouds
- Cryospheric studies and observations
- Cellular Automata and Applications
- Seismic Waves and Analysis
- Wireless Communication Networks Research
- graph theory and CDMA systems
- Antenna Design and Optimization
- Robotics and Sensor-Based Localization
University College London
2001-2021
Abstract. During the first quarter of 2001 apogees Cluster spacecraft quartet precessed through midday local times. This provides opportunity for 4 studies bow shock, magnetosheath and dayside magnetopause current layer boundary layers. In this paper, we present observations electrons in energy range ~ 10 eV–26 keV made by Plasma Electron And Current Experiment (PEACE) located just inside boundary, together with supporting Flux Gate Magnetometer (FGM). these observations, have separations...
Context. Solar wind electrons play an important role in the energy balance of solar acceleration by carrying into interplanetary space form electron heat flux. The flux is stored complex velocity distribution functions (VDFs) shaped expansion, Coulomb collisions, and field-particle interactions. Aims. We investigate how suprathermal deficit anti-strahl direction, which was recently discovered near-Sun wind, drives a kinetic instability creates whistler waves with wave vectors that are...
Abstract. The two PEACE (Plasma Electron And Current Experiment) sensors on board each Cluster spacecraft sample the electron velocity distribution across full 4<pi> solid angle and energy range 0.7 eV to 26 keV with a time resolution of 4 s. We present high angular 3D observations electrons origin in various environments encountered by constellation, including lunar eclipse interval where potential was reduced but remained positive, periods ASPOC (Active Spacecraft POtential Control)...
Abstract. The Double Star Project is a collaboration between Chinese and European space agencies, in which two magnetospheric research spacecraft, carrying instruments, have been launched into equatorial (on 29 December 2003) polar 25 July 2004) orbits designed to enable complementary studies with the Cluster spacecraft. spacecraft TC-1 TC-2 each carry Plasma Electron Current Experiment (PEACE) instrument. These instruments were based on Flight Spare equipment, but differ from important...
This paper describes the algorithm underlying ESA DUE globAlbedo product. The purpose of project is to produce a global 8-day land surface albedo product with associated uncertainty on 1 km grid continuous spatial coverage using data from European sensors. covers period 1999-2011.
Solar Orbiter’s in situ coordination working group met frequently during the development of mission with goal ensuring that its payload has necessary level to maximise science return. Here we present results work, namely how design each instruments (EPD, MAG, RPW, SWA) was guided by need for coordination, importance time synchronisation, and operations will be conducted a coordinated way. We discuss mechanisms which instrument sampling schemes are aligned such complementary measurements made...
Web‐based planetary image dissemination platforms usually show outline coverage of available data and offer querying for metadata as well preview download. While the usual form presenting multiorbit sets is to merge into a larger mosaic, change detection purposes it essential maintain individual images an important snapshot surface taken at specific time. We introduce web‐based interactive Mars Analysis Research System (iMARS web‐GIS), which specialized on analysis with novel tools...
This work presents the coregistered, orthorectified and mosaiced high-resolution products of MC11 quadrangle Mars, which have been processed using novel, fully automatic, techniques. We discuss development a pipeline that achieves automatic parameter independent geometric alignment planetary images, starting from raw input images in NASA PDS format following all required steps to produce coregistered geotiff image, corresponding footprint useful metadata. Additionally, we describe...
Abstract. The Plasma Electron and Current Experiment (PEACE) instruments operate on all four of the Cluster spacecraft measure 3-D velocity distribution electrons in energy range from 0.59 eV to 26.4 keV during each spin. Pitch angle distributions moments are also produced. As mission has progressed, efficiency detectors declined. Several factors may play a role this decline such as exposure radiation, high electron fluxes thruster firings. To account for these variations, continuous...
Small-scale kinetic processes associated with turbulence, plasma instabilities, magnetic reconnection, etc., play a major role in dissipating energy and governing the large-scale evolution of solar wind. However, general impediment to improving understanding physics wind is limitations on measurement cadences particle instruments, which are usually several orders magnitude below equivalent field instruments. Nevertheless, knowledge details velocity distribution functions (VDFs) at sub-second...
We briefly review an existing model of the structure reconnection layers which predicts that several more distinct layers, in form contact discontinuities, rotational Alfvèn waves, or slow shocks, should be identifiable solar wind events than are typically reported studies outflows associated with bifurcated current sheets. re-examine this notion and recast identification such terms changes boundaries both ion electron from layers. then present a case study using Solar Orbiter MAG SWA data,...
Abstract. We present examples of electron measurements from the PEACE instruments on Cluster spacecraft in high-latitude, high-altitude region Earth’s magnetosphere. Using density and energy spectra measurements, we examine two cases where orbit tetrahedron is outbound over northern hemisphere, afternoon sector approaching magnetopause. Data magnetometer also used to pinpoint position with respect magnetospheric boundaries. This preliminary work specifically highlights benefit multipoint...
Abstract. On 1 October 2000, Cluster spacecraft Samba (Cluster 3) and Tango 4) made an outbound crossing of the northern mid-altitude (4.7 RE) cusp region, moving roughly parallel to noon meridian. We present preliminary observations from this interval by PEACE FGM instruments. The interplanetary magnetic field at magnetopause is estimated have turned south time our observations, based on ACE data as well a rough estimate taken for solar wind travel between magnetopause. 3 encountered...
Abstract. The Plasma Electron and Current Experiment (PEACE) instruments operate on all four of the Cluster spacecraft measure 3-D velocity distribution electrons in energy range from 0.59 eV to 26.4 keV during each spin. Pitch angle distributions moments are also produced. As mission progresses efficiency detectors has declined. Several factors may play a role this decline such as exposure radiation, high electron fluxes thruster firings. To account for these variations, continuous...