Search Publications
Cluster observations of velocity space-restricted ion distributions near the plasma sheet
Lundin, R.; Sauvaud, J. -A.; Dandouras, I. +15 more
We present Cluster ion observations obtained at 18 RE in the magnetotail on 1 October 2001. According to a recent analysis, the quartet encountered a reconnection region and a tailward-moving neutral line. We examine in detail selected 3-D ion distributions, which through much of the hour following 0925 UT were non-gyrotropic. B-perpend…
CLUSTER observations of lower hybrid waves excited at high altitudes by electromagnetic whistler mode signals from the HAARP facility
Pickett, J. S.; Inan, U. S.; Platino, M. +3 more
We report new observations from the CLUSTER spacecraft of strong excitation of lower hybrid (LH) waves by electromagnetic (EM) whistler mode waves at altitudes >=20,000 km outside the plasmasphere. Previous observations of this phenomenon occurred at altitudes <=7000 km. The excitation mechanism appears to be linear mode coupling in the pres…
The dependence of Langmuir wave amplitudes on position in Earth's foreshock
Gurnett, D. A.; Balogh, A.; Pickett, J. S. +3 more
We present the first results of Langmuir wave observations in the foreshock from the Cluster WBD Plasma Wave Receiver. When the data were binned by distance to the foreshock boundary, the Langmuir wave amplitude probability distributions followed the log-normal statistics predicted by stochastic growth theory for all regions of the foreshock. The …
The interaction of comet 153P/Ikeya-Zhang with interplanetary coronal mass ejections: Identification of fast ICME signatures
Brandt, John C.; Jones, Geraint H.
The active comet 153P/Ikeya-Zhang possessed a highly-variable plasma tail. Favorable circumstances allowed the identification of the impact of fast ICMEs with the comet. The impact produces a specific morphology including a characteristic scalloped appearance which suggests that the ICME magnetic field drapes around preexisting tail density enhanc…
Meteorological predictions for the Beagle 2 mission to Mars
Michaels, Timothy I.; Haberle, Robert M.; Rafkin, Scot C. Randell
A general circulation and mesoscale model are used to predict the weather at the Beagle 2 landing site. The afternoon high temperature predicted by the general circulation model varies from 237 to 243 K over the duration of the primary mission. The overnight low temperature is 193 K +/- 2 K. Near surface wind speeds remain below 15 ms-1…
Modeling of remote sensing of thin current sheet
Parks, G. K.; Lee, E.; Wilber, M. +2 more
Cluster encountered a thin current sheet in the magnetotail during a substorm on Oct. 1, 2001. The phase space distributions observed by Cluster CIS showed large gradients in the phase space with ions existing only in one hemisphere of the phase space. It has been suggested that these non-gyrotropic distributions come from remote sensing of a thin…
Cluster observations of ULF waves with pulsating electron beams above the high latitude dusk-side auroral region
Winningham, J. D.; Balogh, A.; Dandouras, I. +8 more
We report observations by the four Cluster satellites of particle acceleration associated with ULF (Alfvén) waves at an altitude of 6RE above the dusk-side auroral region. All satellites observed upward accelerated ions and upgoing electron beams, which coincided with the upward field-aligned current around the plasmasheet boundary regi…
Ion injections at auroral latitude during the March 31, 2001 magnetic storm observed by Cluster
Lundin, R.; Sauvaud, J. -A.; Fränz, M. +14 more
We present here simultaneous H+ and O+ ion dispersion signatures observed by three Cluster spacecraft above the northern auroral zone. These observations occur during strong geomagnetic activity (Kp = 9) and are consistent with a time-of-flight (TOF) dispersion of the ions. Using the TOF dispersion of H+…
Structure of interplanetary magnetic cloud on April 16, 1999 and its origin estimated by fitting the torus-shaped flux rope model
Ishibashi, Hiromitsu; Marubashi, Katsuhide
We examined the relationship between interplanetary magnetic cloud observed by the ACE satellite on April 16, 1999 and its solar origin. The solar and interplanetary background was relatively quiet for 10 clear days before April 16, enabling us to unambiguously assume the solar origin of the magnetic cloud. However, the results of fitting a consta…
A slow streamer blowout at the Sun and Ulysses
Bemporad, A.; Poletto, G.; Suess, S. T.
On 10 June 2000 a streamer on the southeast limb slowly disappeared from LASCO/C2 over ~10 hours. A small CME was reported in C2. A substantial interplanetary CME (ICME) was later detected at Ulysses, which was at quadrature with the Sun and SOHO at the time. This detection illustrates the properties of an ICME for a known solar source and demonst…