Search Publications
Evaluating Proton Intensities for the SMILE Mission
Escoubet, C. P.; Kronberg, Elena A.; Mischel, Simon
This study introduces five linear regression models developed to accurately predict proton intensities in the critical energy range of 92.2–159.7 keV. To achieve this task we utilized 14 years of data sourced from the Cluster's RAPID experiment and NASA's OMNI database. This data was then aligned with the Solar wind-Magnetosphere-Ionosphere Link E…
Prediction of Proton Pressure in the Outer Part of the Inner Magnetosphere Using Machine Learning
Mouikis, C. G.; Kronberg, E. A.; Li, S. Y. +3 more
The information on plasma pressure in the outer part of the inner magnetosphere is important for simulations of the inner magnetosphere and a better understanding of its dynamics. Based on 17-year observations from both Cluster Ion Spectrometry and Research with Adaptive Particle Imaging Detector instruments onboard the Cluster mission, we used ma…
Reconstruction of Extreme Geomagnetic Storms: Breaking the Data Paucity Curse
Merkin, V. G.; Sitnov, M. I.; Roelof, E. C. +5 more
Reconstruction of the magnetic field, electric current, and plasma pressure is provided using a new data mining (DM) method with weighted nearest neighbors (NN) for strong storms with the storm activity index Sym-H < -300 nT, the Bastille Day event (July 2000), and the 20 November 2003 superstorm. It is shown that the new method significantly r…
In Situ Data and Effect Correlation During September 2017 Solar Particle Event
Müller, D.; Vainio, R.; Sánchez-Cano, B. +28 more
Solar energetic particles are one of the main sources of particle radiation seen in space. In the first part of September 2017 the most active solar period of cycle 24 produced four large X-class flares and a series of (interplanetary) coronal mass ejections, which gave rise to radiation storms seen over all energies and at the ground by neutron m…
Electron Intensity Measurements by the Cluster/RAPID/IES Instrument in Earth's Radiation Belts and Ring Current
Daly, P. W.; Kronberg, E. A.; Taylor, M. G. G. T. +7 more
The Cluster mission, launched in 2000, has produced a large database of electron flux intensity measurements in the Earth's magnetosphere by the Research with Adaptive Particle Imaging Detector (RAPID)/Imaging Electron Spectrometer (IES) instrument. However, due to background contamination of the data with high-energy electrons (>400 keV) and i…
Testing Efficiency of Empirical, Adaptive, and Global MHD Magnetospheric Models to Represent the Geomagnetic Field in a Variety of Conditions
Sergeev, V. A.; Zheng, Y.; Tsyganenko, N. A. +1 more
We used data for eight magnetospheric spacecraft providing magnetic observations in various magnetospheric domains during a six-day time period, including the June 2015 storm, and a five-day period including the March 2015 storm. For these time intervals, containing different solar wind regimes and different activity levels, we used three types of…
Extension of an Empirical Electron Flux Model From 6 to 20 Earth Radii Using Cluster/RAPID Observations
Taylor, M. G. G. T.; Henderson, M. G.; Rodriguez, J. V. +1 more
An existing empirical model of the electron fluxes at geosynchronous orbit is extended radially outward in the equatorial plane to 6-20 Earth radii (RE) using observations from the Research with Adaptive Particle Imaging Detectors (RAPID) instrument on the Cluster spacecraft. The new model provides electron flux predictions in the energ…
Development of a 3-D Plasmapause Model With a Back-Propagation Neural Network
He, Fei; Lei, Jiuhou; Zhang, Xiao-Xin +2 more
Several empirical models have been previously developed to study the characteristics of the global plasmasphere. A three-dimensional solar wind-driven global dynamic plasmapause model was developed in this study using a back-propagation neural network based on multisatellite measurements. Our database contains 37,859 plasmapause crossing events fr…
O+ Escape During the Extreme Space Weather Event of 4-10 September 2017
Nilsson, Hans; Dandouras, Iannis; Slapak, Rikard +5 more
We have investigated the consequences of extreme space weather on ion outflow from the polar ionosphere by analyzing the solar storm that occurred early September 2017, causing a severe geomagnetic storm. Several X-flares and coronal mass ejections were observed between 4 and 10 September. The first shock—likely associated with a coronal mass ejec…
Empirical Modeling of the Quiet and Storm Time Geosynchronous Magnetic Field
Tsyganenko, N. A.; Andreeva, V. A.
A dynamical empirical model of the near-geosynchronous magnetic field has been constructed, based on a recently developed radial basis functions approach and a multiyear set of spacecraft data taken by Time History of Events and Macroscale Interactions during Substorms (THEMIS), Polar, Cluster, and Van Allen Probes missions including 133 geomagnet…