Search Publications
Predicting the Time of Arrival of Coronal Mass Ejections at Earth From Heliospheric Imaging Observations
Vourlidas, Angelos; Stenborg, Guillermo; Dal Lago, Alisson +3 more
The time of arrival (ToA) of coronal mass ejections (CMEs) at Earth is a key parameter due to the space weather phenomena associated with the CME arrival, such as intense geomagnetic storms. Despite the incremental use of new instrumentation and the development of novel methodologies, ToA estimated errors remain above 10 h on average. Here, we inv…
Adiabatic Invariants Calculations for Cluster Mission: A Long-Term Product for Radiation Belts Studies
Kronberg, Elena A.; Daly, Patrick W.; Shprits, Yuri Y. +3 more
Observation of the Large-Amplitude and Fast-Damped Plasma Sheet Flapping Triggered by Reconnection-Induced Ballooning Instability
Escoubet, C. P.; Dandouras, I.; Wang, C. +5 more
In this study, we reported the large-amplitude and fast-damped flapping of the plasma sheet, which co-occurred with magnetic reconnection. Data from the Double Star TC-1 and Cluster satellites were used to analyze the features of the plasma sheet flapping 1.4 RE earthward of an ongoing magnetic reconnection event. The flapping was rapid…
Determination of the Configurations of Boundaries in Space
Russell, C. T.; Dunlop, M.; Rong, Zhaojin +5 more
This research aims to determine the geometrical configurations of boundary surfaces in the space environment, based on multiple spacecraft measurements. To achieve this, the Normal Field Analysis (NFA) method is presented here. With multipoint observations, the three-dimensional gradient of the normal of boundary layers can be obtained, and the pr…
Mars' Ionospheric Interaction With Comet C/2013 A1 Siding Spring's Coma at Their Closest Approach as Seen by Mars Express
Leblanc, François; Cowley, Stanley W. H.; Cardesín-Moinelo, Alejandro +9 more
On 19 October 2014, Mars experienced a close encounter with Comet C/2013 A1 Siding Spring. Using data from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) on board Mars Express (MEX), we assess the interaction of the Martian ionosphere with the comet's coma and possibly magnetic tail during the orbit of their closest approa…
Mars Express Observations of Cold Plasma Structures in the Martian Magnetotail
Lester, M.; Edberg, N. J. T.; Andrews, D. J. +5 more
We present observations from five Mars Express (MEX) orbits in September 2016 while the spacecraft passed through the Martian induced magnetotail at altitudes up to 3,500 km. On these orbits, the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument was operated in Active Ionospheric Sounding (AIS) mode at much higher alti…
Plasma Density and Magnetic Field Fluctuations in the Ion Gyro-Frequency Range Near the Diamagnetic Cavity of Comet 67P
Nilsson, H.; André, M.; Vaivads, A. +8 more
We report the detection of large-amplitude, quasi-harmonic density fluctuations with associated magnetic field oscillations in the region surrounding the diamagnetic cavity of comet 67P. Typical frequencies are ∼0.1 Hz, corresponding to ∼10 times the water and ≲ 0.5 times the proton gyro-frequencies, respectively. Magnetic field oscillations are n…
Dependence of Dayside Electron Densities at Venus on Solar Irradiance
Pätzold, M.; Häusler, B.; Tellmann, S. +3 more
The ionosphere of Venus is a weakly ionized plasma layer embedded in the planet's upper atmosphere. Planetary ionospheres provide an excellent opportunity to study how our variable Sun affects the planets in our solar system. Because ionospheres are reservoirs from which atmospheric species can be lost to space, studying how ionospheres respond to…
Characteristics of Reconnection Sites and Fast Flow Channels in an MHD Simulation
McPherron, R. L.; El-Alaoui, M.; Walker, R. J. +1 more
We investigate an interval of moderate magnetic activity from 0-8 UT on 14 March 2008 by using a global magnetohydrodynamics (MHD) simulation with high spatial and temporal resolution. Observations show several distinct substorms during this interval. One of these with onset at 04:44 UT occurs at 04:42 UT in the simulation. The simulation shows re…
Dependence of the Interplanetary Magnetic Field on Heliocentric Distance at 0.3-1.7 AU: A Six-Spacecraft Study
Hanneson, Cedar; Johnson, Catherine L.; Mittelholz, Anna +2 more
We use magnetometer data taken simultaneously by MESSENGER, VEX, STEREO and ACE to characterize the variation of the interplanetary magnetic field (IMF) with heliocentric distance, rh, for rh≲ 1 AU. Power law fits (a rh b) to the individual IMF components and magnitude indicate that, on average, the IMF is more tightly wound and its strength decre…