Search Publications
Auroral kilometric radiation and magnetosphere-ionosphere coupling process during magnetic storms
Misawa, H.; Tsuchiya, F.; Morioka, A. +8 more
This paper presents an investigation of a magnetosphere-ionosphere (M-I) coupling process during magnetic storms, using observations of auroral kilometric radiation (AKR) in the field-aligned acceleration region and plasma density variation in the plasma sheet. The main phase electron precipitation, which AKR does not accompany, was confirmed as n…
Narrowband Z-mode emissions interior to Saturn's plasma torus
Gurnett, D. A.; Kurth, W. S.; Kaiser, M. L. +3 more
During Cassini's close approach to Saturn, on 1 July 2004, a set of narrow bandwidth plasma emissions were detected by the Radio and Plasma Wave Science (RPWS) instrument in the inner magnetosphere. These discrete tones were detected between 3 and 70 kHz, with individual tone bandwidths as low as a few hundred Hertz. The tones persisted for long t…
Planetary foreshock radio emissions
Cairns, Iver H.; Kuncic, Zdenka
The electron foreshock regions upstream of Earth's bow shock and upstream of traveling interplanetary shocks are known to be propitious sites for a variety of energetic particle and plasma wave phenomena, including radio emissions. A quantitative theoretical model has been developed for radio emissions associated with the terrestrial foreshock and…
Time variations of cosmic ray electrons and nuclei between 1978 and 2004: Evidence for charge-dependent modulation organized by changes in solar magnetic polarity and current sheet tilt
Heber, B.; Webber, W. R.; Lockwood, J. A.
We have examined the 52-day average intensities of 1.2-GV electrons and positively charged nuclei of the same rigidity during the time period from 1978 to 2004. This time period covers a complete 22-year solar cycle plus data from 2000 to 2004 that can be used to examine the repetitive nature of the variations. The 11-year solar modulation changes…
An unusually fast interplanetary coronal mass ejection observed by Ulysses at 5 AU on 15 November 2003
St. Cyr, O. C.; McComas, D. J.; Balogh, André +7 more
On 15 November 2003, at ∼2030 UT, Ulysses/SWOOPS observed the onset of a large, unusually fast interplanetary coronal mass ejection (ICME) in the solar wind at 5.2 AU. Ulysses measured the peak solar wind flow speed associated with this event, vmax = 993 km s-1, in the turbulent sheath region preceding the ICME. This is the f…
Near-relativistic electron emission following the 28 October 2003 X17 flare
Simnett, G. M.
The 28 October 2003 solar flare event was one of the largest electron events above 50 keV of the current solar cycle. The event was associated with a major flare, at least one fast coronal mass ejection (CME), and a prominence eruption. The evolution of the electron spectrum for this event enables us to resolve three, or possibly four, separate el…
Global observations of energetic electrons around the time of a substorm on 27 August 2001
Davies, J. A.; Baker, D. N.; Li, X. +2 more
The magnetospheric substorm that occurred shortly after 04:00 UT on 27 August 2001 has been a topic of detailed study (Baker et al., 2002; Li et al., 2003). These studies included analysis of data from energetic electron detectors aboard the Cluster and Polar spacecraft that were located in the magnetotail during the substorm. Serendipitously, Cha…
Bouncing ion clusters in the plasma sheet boundary layer observed by Cluster-CIS
Lundin, R.; Dandouras, I.; RèMe, H. +10 more
We report on ion beams injected into the plasma sheet boundary layer (at or near the separatrix) at distances >39 RE and up to 169 RE that bounced several times back and forth (up to three echoes) while remaining in coherent bunches before thermalizing in the central plasma sheet. These bouncing ion clusters (BIC) interact…
Effect of the latitudinal distribution of temperature at the coronal base on the interplanetary magnetic field configuration and the solar wind flow
Li, Xing; Habbal, Shadia Rifai; Li, Bo +1 more
Using a two-dimensional MHD model of the corona and solar wind, we investigate the role of the temperature distribution with latitude at the coronal base on the global magnetic field configuration and solar wind properties at 1 AU. The latitudinal distribution of temperature is aimed at modeling the transition in electron temperature at the Sun fr…
A phase locking mechanism for nongyrotropic electron distributions upstream of the Earth's bow shock
Glassmeier, K. -H.; Fazakerley, A. N.; Gurgiolo, C. +2 more
Observations of nongyrotropic electron distributions in the region upstream of the Earth's bow shock suggest that there exists a mechanism to lock in their phase, otherwise they would rapidly gyrophase mix into a ring-beam distribution. Measurements by the Plasma Electron and Current Experiment (PEACE) on the Cluster spacecraft have provided a way…