Search Publications
Seasonal and Hemispheric Asymmetries of F Region Polar Cap Plasma Density: Swarm and CHAMP Observations
Reistad, J. P.; Laundal, K. M.; Haaland, S. +6 more
One of the primary mechanisms of loss of Earth's atmosphere is the persistent "cold" (T≲ 20 eV) ion outflow that has been observed in the magnetospheric lobes over large volumes with dimensions of order several Earth radii. As the main source of this cold ion outflow, the polar cap F region ionosphere and conditions within it have a disproportiona…
Parametric Dependence of the Formation of Electron Butterfly Pitch Angle Distribution Driven by Magnetosonic Waves
Fu, Song; Ni, Binbin; Gu, Xudong +10 more
Using the full relativistic test particle (TP) simulation code, we investigate the parametric dependence of electron scattering and phase space density evolution driven by magnetosonic (MS) waves at L = 4.5 both inside and outside the plasmapause. The scattering effects caused by Landau resonance, bounce resonance, and the transit-time effect are …
Cross-Scale Quantification of Storm-Time Dayside Magnetospheric Magnetic Flux Content
Le Contel, O.; Fontaine, D.; Akhavan-Tafti, M. +2 more
A clear understanding of storm-time magnetospheric dynamics is essential for a reliable storm forecasting capability. The dayside magnetospheric response to an interplanetary coronal mass ejection (ICME; dynamic pressure Pdyn > 20 nPa and storm-time index SYM-H < -150 nT) is investigated using in situ OMNI, Geotail, Cluster, MMS, …
FIDO-SIT: The First Forward Model for the In Situ Magnetic Field of CME-Driven Sheaths
Jian, L. K.; Nieves-Chinchilla, T.; Kay, C.
We have shown previously that the in situ magnetic field of coronal mass ejections (CMEs) can be well reproduced by simple, physics-driven flux rope models using the ForeCAT In situ Data Observer (FIDO, Kay et al., 2017). Here, we show that a similar approach can be taken to forward model the shock and sheath of a CME (Sheath Induced by Transient …
Magnetospheric Interactions of Saturn's Moon Dione (2005-2015)
Krupp, N.; Jones, G. H.; Roussos, E. +5 more
The moon Dione orbits Saturn at 6.2 Saturn radii RS deep in the Kronian magnetosphere. In situ studies of the moon-magnetosphere interaction processes near Dione were possible with the Cassini/Huygens mission which flew by close to Dione five times at distances between 99 and 516 km. In addition, Cassini crossed Dione's L-shell more tha…
Reconstructing Solar Wind Inhomogeneous Structures From Stereoscopic Observations in White Light: Solar Wind Transients in 3-D
Wang, Yuming; Shen, Fang; Shen, Chenglong +7 more
White-light images from Heliospheric Imager-1 (HI1) onboard the Solar Terrestrial Relations Observatory (STEREO) provide two-dimensional (2-D) global views of solar wind transients traveling in the inner heliosphere from two perspectives. How to retrieve the hidden three-dimensional (3-D) features of the transients from these 2-D images is intrigu…
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…