Search Publications
Magnetospheric "Penetration" of IMF By Viewed Through the Lens of an Empirical RBF Modeling
Tsyganenko, N. A.; Andreeva, V. A.
The spiral structure of the interplanetary magnetic field (IMF) is known to induce intramagnetospheric azimuthal magnetic field By, which strongly correlates with the IMF By. We reconstruct this effect for the first time in 3-D, using a large set of data taken in the near/inner magnetosphere and a flexible magnetic field model based on expansions …
Convection in the Magnetosphere-Ionosphere System: A Multimission Survey of Its Response to IMF <span type="mathematics">By Reversals
Fear, R. C.; Haaland, S.; Case, N. A. +2 more
Past studies have demonstrated that the interplanetary magnetic field (IMF) By component introduces asymmetries in the magnetosphere-ionosphere (M-I) system, though the exact timings involved are still unclear with two distinct mechanisms proposed. In this study, we statistically analyze convective flows from three regions of the M-I sy…
Energized Oxygen in the Magnetotail: Current Sheet Bifurcation From Speiser Motion
George, Don E.; Jahn, Jörg-Micha
Oxygen can be a major constituent of magnetospheric plasma, yet the role of oxygen in the magnetosphere is not sufficiently understood. Observations of bifurcated current sheets (BCS) attributed to O+ have been made, yet their origin is not well understood. We examine the case of a thinning current sheet prior to the onset of magnetic r…
Turbulence Near the Venusian Bow Shock: Venus Express Observations
Zhang, T. L.; Vörös, Z.; Chen, Y. Q. +3 more
In terms of composition and size, Venus is an Earth-like planet without a global intrinsic magnetic field. The Venusian bow shock and magnetosheath, reaching only 10% of the size of the Earth, are formed from the interaction of the solar wind with the Venusian ionosphere. Energy injection from the solar wind to the Venusian space environment can b…
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…