Search Publications
Low Geo-Effectiveness of Fast Halo CMEs Related to the 12 X-Class Flares in 2002
Bocchialini, K.; Schmieder, B.; Poedts, S. +4 more
It is generally accepted that extreme space weather events tend to be related to strong flares and fast halo coronal mass ejections (CMEs). In the present paper, we carefully identify the chain of events from the Sun to the Earth induced by all 12 X-class flares that occurred in 2002. In this small sample, we find an unusual high rate (58%) of sol…
The Global Distribution of Ultralow-Frequency Waves in Jupiter's Magnetosphere
Masters, A.; Manners, H.
Jupiter's giant magnetosphere is a complex system seldom in a configuration approximating steady state, and a clear picture of its governing dynamics remains elusive. Crucial to understanding how the magnetosphere behaves on a large scale are disturbances to the system on length-scales comparable to the cavity, which are communicated by magnetohyd…
Sequential Observations of Flux Transfer Events, Poleward-Moving Auroral Forms, and Polar Cap Patches
Russell, C. T.; Khotyaintsev, Y.; Fear, R. C. +17 more
We report the observation of solar wind-magnetosphere-ionosphere interactions using a series of flux transfer events (FTEs) observed by Magnetospheric MultiScale (MMS) mission located near the dayside magnetopause on 18 December 2017. The FTEs were observed to propagate duskward and either southward or slightly northward, as predicted under duskwa…
Foreshock Cavities at Venus and Mars
Zhang, Tielong; Futaana, Yoshifumi; Frahm, Rudy +7 more
"Foreshock cavities" are regions of turbulent and heated solar wind plasma that form upstream of Earth's bow shock. Despite being common at Earth, none have yet been reported at other planets. Here we present a survey of events encountered by the ESA Venus Express spacecraft consistent with foreshock cavities at Venus and a case study of a foresho…
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…