Search Publications
Turbulence and intermittency in the heliospheric magnetic field in fast and slow solar wind
Balogh, A.; Noullez, A.; von Steiger, R. +1 more
We study the nonuniform solar wind turbulence using high-resolution Ulysses magnetic field data measured at different solar activity level, heliospheric latitudes, and distance. We define several types of solar wind dependent of the coronal region of origin and also of the dynamical behavior of the different streams, namely, “pure” fast wind, fast…
Analysis of narrowband emission observed in the Saturn magnetosphere
Gurnett, D. A.; Coates, A. J.; Santolik, O. +4 more
Narrowband emission is observed at Saturn centered near 5 kHz and 20 kHz and harmonics of 20 kHz. This emission appears to be in many ways similar to Jovian narrowband emission observed at higher frequencies. We analyze one example of this emission near a possible source region. In situ electron distributions suggest narrowband emission has a sour…
Simultaneous observations of flux transfer events by THEMIS, Cluster, Double Star, and SuperDARN: Acceleration of FTEs
Dandouras, I.; Fazakerley, A. N.; Milan, S. E. +3 more
We present simultaneous observations of flux transfer events (FTEs) made by the THEMIS and Cluster spacecraft on 3 May 2007, along with supporting observations of fast flows in the dayside ionosphere observed by the SuperDARN radar network. The THEMIS spacecraft were in a string-of-pearls formation approximately 20,000 km long and crossed the post…
L shell distribution of energetic electrons at Saturn
Krupp, N.; Krimigis, S. M.; Mitchell, D. G. +1 more
Energetic electron fluxes (110-485 keV) observed by the MIMI/LEMMS instrument on the Cassini mission to Saturn were averaged into azimuthal bins and L shell bins for the period from day 150 2004 to day 366 2008. In local time, the electrons fluxes maximize on the night side between the Mimas and Rhea L shells and have a minimum near noon. This loc…
Energetic plasma sheet electrons and their relationship with the solar wind: A Cluster and Geotail study
Dandouras, I.; Baker, D. N.; Fritz, T. A. +4 more
The statistical relationship between tens of kiloelectron volts plasma sheet electrons and the solar wind, as well as >2 MeV geosynchronous electrons, is investigated using plasma sheet measurements from Cluster (2001-2005) and Geotail (1998-2005) and concurrent solar wind measurements from ACE. Plasma sheet selection criteria from previous stu…
Multipoint observations of ions in the 30-160 keV energy range upstream of the Earth's bow shock
Daly, P. W.; Klecker, B.; Lucek, E. A. +2 more
We use multipoint observation data by Cluster during time periods when the interspacecraft separation distance was between 1 and 1.5 Earth radii in order to study the physical processes related to diffuse ions at <200 keV/e. For our analysis we use data from the Research with Adaptive Particle Imaging Detectors (RAPID) experiment onboard Cluste…
A practical database method for predicting arrivals of ``average'' interplanetary shocks at Earth
Feng, X. S.; Zhang, Y.; Dryer, M. +3 more
A practical database method for predicting the interplanetary shock arrival time at L1 point is presented here. First, a shock transit time database (hereinafter called Database-I) based on HAFv.1 (version 1 of the Hakamada-Akasofu-Fry model) is preliminarily established with hypothetical solar events. Then, on the basis of the prediction test res…
Vortex-like plasma flow structures observed by Cluster at the boundary of the outer radiation belt and ring current: A link between the inner and outer magnetosphere
Zhang, H.; Zong, Q. -G.; Daly, P. W. +8 more
Two vortex-like plasma flow structures have been observed at the outer radiation belt and/or the ring current region on 11 April 2002, from 0415 to 0635 UT, when the Cluster fleet entered (in the Southern Hemisphere) and exited (in the Northern Hemisphere) the boundary layer of the inner magnetosphere near 2130 MLT. On 11 April 2002 during the per…
Magnetic decrease formation from <1 AU to ∼5 AU: Corotating interaction region reverse shocks
Tsurutani, Bruce T.; Echer, Ezequiel; Guarnieri, Fernando L. +2 more
Magnetic decreases (MDs) have been identified and studied throughout a Ulysses fast latitude scan that lasted from 29 February 1992 to 14 September 1993. Ulysses' distance was ∼5 AU from the Sun. MDs were unbiasedly selected by application of the Interplanetary Magnetic Decrease Automatic Detection code. MDs were found to occur in high-occurrence-…
Identification of photoelectron energy peaks in Saturn's inner neutral torus
Schippers, P.; André, N.; Coates, A. J. +5 more
We present observations from the Cassini Plasma Electron Spectrometer (CAPS/ELS) of characteristic peaks in the electron energy spectrum that are identified in the innermost regions of the Saturnian magnetosphere during low-latitude orbits of the Cassini spacecraft around Saturn. We show how a narrow electron energy peak at about 20 eV and a possi…