Search Publications
Transport of energetic electrons into Saturn's inner magnetosphere
Krupp, N.; Roussos, E.; Johnson, R. E. +8 more
We present energetic electron data obtained by Cassini's Magnetospheric Imaging Instrument in the inner magnetosphere of Saturn. We find here that inward transport and energization processes are consistent with conservation of the first two adiabatic invariants of motion. We model several injections near local midnight, one injection has a maximum…
Ten years of Hubble Space Telescope observations of the variation of the Jovian satellites' auroral footprint brightness
Nichols, J. D.; Clarke, J. T.; Wannawichian, S.
During the past decade, FUV imaging of Jupiter's auroral region by the Hubble Space Telescope (HST) using two instruments, the Space Telescope Imaging Spectrograph (STIS) and the Advanced Camera for Surveys (ACS), has provided detailed information on the electrodynamic interaction between Io's, Ganymede's, and Europa's atmospheres and plasma in Ju…
Multiple harmonic ULF waves in the plasma sheet boundary layer: Instability analysis
RèMe, H.; Keiling, A.; Walsh, A. P. +5 more
Multiple-harmonic electromagnetic waves in the ULF band have occasionally been observed in Earth's magnetosphere, both near the magnetic equator in the outer plasmasphere and in the plasma sheet boundary layer (PSBL) in Earth's magnetotail. Observations by the Cluster spacecraft of multiple-harmonic electromagnetic waves with fundamental frequency…
Cassini observations of narrowband radio emissions in Saturn's magnetosphere
Gurnett, D. A.; Russell, C. T.; Kurth, W. S. +5 more
The Radio and Plasma Wave Science instrument (RPWS) on board the Cassini spacecraft has detected numerous narrowband radio emissions in Saturn's magnetosphere from September 2005 to May 2007. Typically, the narrowband radio emissions occur after an intensification of Saturn kilometric radiation (SKR) and last for several days. These emissions ofte…
Empirical modeling of a CIR-driven magnetic storm
Anderson, B. J.; Sitnov, M. I.; Lui, A. T. Y. +4 more
The empirical analysis of structure and evolution of the geomagnetic field and underlying electric currents during the 8-11 March 2008 magnetospheric storm, driven by a corotating interaction region, is presented. It is based on the high-resolution geomagnetic field model TS07D (http://geomag_field.jhuapl.edu/model/) and the low-altitude mapping o…
North-south asymmetry of the location of the heliospheric current sheet revisited
Balogh, A.; ErdőS, G.
The possible latitudinal offset of the location of the heliospheric current sheet (HCS) is an important question, since it has impact on the understanding of various phenomena including the solar dynamo and the modulation of cosmic rays. In the declining phase of the previous, 22nd solar cycle, in 1993, a southward displacement of the HCS by 10° w…
South-north asymmetry of field-aligned currents in the magnetotail observed by Cluster
Zhang, T. L.; Dandouras, I.; Lucek, E. +18 more
We statistically investigated features of the field-aligned current (FAC) distribution in plasma sheet boundary layers between 17 and 19 RE in the magnetotail using the curlometer technique to calculate the current from four-point magnetic field measurements taken in 2001. The results show that the FAC distribution in the plasma sheet b…
Characteristics of ground-level enhancement-associated solar flares, coronal mass ejections, and solar energetic particles
Cho, K. -S.; Firoz, K. A.; Hwang, J. +7 more
Ground-level enhancements (GLEs) are sudden, sharp, and short-lived increases in cosmic ray intensities registered by neutron monitors. These enhancements are known to take place during powerful solar eruptions. In the present investigation, the cosmic ray intensities registered by the Oulu neutron monitor have been studied for the period between …
Magnetic energy distribution in the four-dimensional frequency and wave vector domain in the solar wind
Glassmeier, K. -H.; Sahraoui, F.; Goldstein, M. L. +1 more
We present a measurement of the energy distribution in the four-dimensional (4-D) frequency and wave vector domain of magnetic field fluctuations in the solar wind. The measurement makes use of the wave telescope technique that has been developed particularly for multispacecraft data analysis. We review briefly the theoretical background and then …
An empirical model for prediction of geomagnetic storms using initially observed CME parameters at the Sun
Cho, K. -S.; Kim, K. -H.; Moon, Y. -J. +7 more
In this study, we discuss the general behaviors of geomagnetic storm strength associated with observed parameters of coronal mass ejection (CME) such as speed (V) and earthward direction (D) of CMEs as well as the longitude (L) and magnetic field orientation (M) of overlaying potential fields of the CME source region, and we develop an empirical m…