Search Publications
Cluster observations of collisionless Hall reconnection at high-latitude magnetopause
Balogh, A.; Zhang, H.; Zong, Q. -G. +6 more
The first in situ observation of collisionless Hall reconnection in the high-latitude region when the interplanetary magnetic field (IMF) By dominates is reported in this paper. On 23 March 2002, Cluster crossed the magnetopause current sheet when it traveled outbound in the Northern Hemisphere. The interface between the cusp and the ma…
Track analysis of energetic neutral atom blobs at Saturn
Krimigis, S. M.; Mitchell, D. G.; Roelof, E. C. +2 more
A statistical analysis of observations of the Magnetospheric Imaging Instrument (MIMI) on the Cassini spacecraft at Saturn reveals the morphology and dynamics of energetic neutral atoms (ENA). The ENA (20-50 keV hydrogens) images are smoothed and projected onto Saturn's equatorial plane, and the intensities are slant-corrected using a thin-disk ap…
Downward current electron beam observed by Cluster and FAST
Owen, Christopher J.; Dunlop, Malcolm W.; Wright, Andrew N. +1 more
We report observations from a conjunction of FAST and Cluster during an interval of downward current at an MLT of 3-4 h on field lines mapping to the PSBL. Both spacecraft see upgoing electrons with an energy of a few hundred eV, suggesting substantial acceleration has occurred below FAST's altitude of 3200 km. At Cluster, isolated bursts of elect…
Extended SuperDARN and IMAGE observations for northward IMF: Evidence for dual lobe reconnection
Milan, S. E.; Amata, E.; Retinò, A. +4 more
We present observations of ionospheric convection in the Northern Hemisphere made by the SuperDARN radar network during a 3 h period on 3 December 2001. The interplanetary magnetic field (IMF) during the time of observations is predominately northward with the B y component changing from positive to slightly negative. During this peri…
Cluster observations of O+ escape in the magnetotail due to shock compression effects during the initial phase of the magnetic storm on 17 August 2001
Zong, Q. -G.; Reme, H.; Korth, A. +5 more
We study the O+ outflow into the magnetotail during the initial phase of the 17 August 2001 magnetic storm. Solar wind and magnetospheric data are used from instruments onboard ACE, WIND, and Cluster spacecraft. The interplanetary shock arrival at Earth caused a large compression of the magnetosphere. During this event, the Cluster spac…
Reconnection at the dayside magnetopause: Comparisons of global MHD simulation results with Cluster and Double Star observations
Berchem, J.; Escoubet, C. P.; Balogh, A. +8 more
This study uses two conjunctions between Cluster and Double Star TC-1 spacecraft together with global magnetohydrodynamic (MHD) simulations to investigate the large-scale configuration of magnetic reconnection at the dayside magnetopause. Both events involve southward interplanetary magnetic fields with significant By components. The fi…
Synthetic radio maps of CME-driven shocks below 4 solar radii heliocentric distance
Gopalswamy, N.; Schmidt, J. M.
We present 2 1/2 D numerical MagnetoHydroDynamic (MHD) simulations of coronal mass ejections (CMEs) in conjunction with plasma simulations of radio emission from the CME-driven shocks. The CME-driven shock extends to an almost spherical shape during the temporal evolution of the CME. Our plasma simulations can reproduce the dynamic spectra of coro…
Cluster observations of the midaltitude cusp under strong northward interplanetary magnetic field
RèMe, H.; Fazakerley, A. N.; Owen, C. J. +3 more
We report on a multispacecraft cusp observation lasting more than 100 min. We determine the cusp boundary motion and reveal the effect on the cusp size of the interplanetary magnetic field (IMF) changing from southward to northward. The cusp shrinks at the beginning of the IMF rotation and it reexpands at the rate of 0.40° invariant latitude per h…
Magnetotail dipolarization and associated current systems observed by Cluster and Double Star
Zhang, T. L.; RèMe, H.; Fazakerley, A. N. +22 more
A dipolarization and its associated current systems are studied using Cluster, Double Star TC1, and ground-based observations. The Cluster spacecraft are located approximately 16 RE downtail near 0030 LT. The Double Star TC1 spacecraft is located more earthward at approximately 7 RE just before local midnight. Auroral observa…
Multiple cusps during an extended northward IMF period with a significant By component
Winningham, J. D.; Wing, S.; Balogh, A. +11 more
On 21-22 March 2001, four cusp-like regions were observed consecutively in about five hours by all four Cluster spacecraft when the interplanetary magnetic field (IMF) was northward with a significant By component. All four cusp-like encounters were characterized by turbulent magnetic fields, high-density plasma, and plasma flow signifi…