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An auroral oval at the footprint of Saturn's kilometric radio sources, colocated with the UV aurorae
Cecconi, B.; Lamy, L.; Nichols, J. D. +3 more
Similarly to other magnetized planets, Saturn displays auroral emissions generated by accelerated electrons gyrating around high-latitude magnetic field lines. They mainly divide in ultraviolet (UV) and infrared (IR) aurorae, excited by electron collisions with the upper atmosphere, and Saturn's kilometric radiation (SKR), radiated from higher alt…
Development of the 3-D MHD model of the solar corona-solar wind combining system
Tanaka, T.; Kubo, Y.; Shinagawa, H. +3 more
In the framework of integrated numerical space weather prediction, we have developed a 3-D MHD simulation model of the solar surface-solar wind system. We report the construction method of the model and its first results. By implementing a grid system with angularly unstructured and increasing radial spacing, we realized a spherical grid that has …
Ion conics and electron beams associated with auroral processes on Saturn
Krupp, N.; Dougherty, M. K.; Hospodarsky, G. B. +7 more
Ion conics accompanied by electron beams are observed regularly in Saturn's magnetosphere. The beams and conics are seen throughout the outer magnetosphere, on field lines that nominally map from well into the polar cap (Ldipole > 50) to well into the closed field region (Ldipole < 10). The electron beams and ion conics…
The Io UV footprint: Location, inter-spot distances and tail vertical extent
Delamere, P. A.; Bonfond, B.; Clarke, J. T. +4 more
The Io footprint (IFP) consists of one or several spots observed in both jovian hemispheres and is related to the electromagnetic interaction between Io and the magnetosphere. These spots are followed by an auroral curtain, called the tail, extending more than 90° longitude in the direction of planetary rotation. We use recent Hubble Space Telesco…
Quiescent current sheets in the solar wind and origins of slow wind
Ko, Y. -K.; Moore, R. L.; von Steiger, R. +1 more
Solar wind near the heliospheric current sheet is investigated using Ulysses and ACE data in a superposed epoch analysis for several days on either side of the current sheets. Only data near sunspot minima are used, minimizing the influence of transients. New results are shown for composition and ionization state. Existing results showing a ∼2 day…
Energetic particle pressure in Saturn's magnetosphere measured with the Magnetospheric Imaging Instrument on Cassini
Krupp, N.; Dougherty, M. K.; Krimigis, S. M. +5 more
The Magnetospheric Imaging Instrument on board Cassini has been providing measurements of energetic ion intensities, energy spectra, and ion composition, combining the Charge Energy Mass Spectrometer over the range 3 to 236 keV/e, the Low Energy Magnetospheric Measurements System for ions in the range 0.024 to 18 MeV, and the Ion and Neutral Camer…
Three-dimensional MHD modeling of the solar wind structures associated with 13 December 2006 coronal mass ejection
Kataoka, R.; Ebisuzaki, T.; Kusano, K. +4 more
A 3-D magnetohydrodynamic (MHD) simulation is performed to reconstruct the interplanetary propagation of a coronal mass ejection (CME) that occurred on 13 December 2006. A spheromak-type magnetic field is superposed on a realistic ambient solar wind to reproduce the large-scale interplanetary magnetic field (IMF) associated with the CME. Here we s…
Observation of waves near lower hybrid frequency in the reconnection region with thin current sheet
Lucek, E.; Vaivads, A.; Rème, H. +8 more
The role of waves and turbulence in the process of magnetic reconnection has been the subject of a great deal of studies and debates in the theoretical literature. Here we report the Cluster observations of electrostatic and electromagnetic waves near the lower hybrid frequency in the reconnection region with a thin current sheet. During the cross…
A solar storm observed from the Sun to Venus using the STEREO, Venus Express, and MESSENGER spacecraft
Coates, A. J.; Winningham, J. D.; Frahm, R. A. +23 more
The suite of SECCHI optical imaging instruments on the STEREO-A spacecraft is used to track a solar storm, consisting of several coronal mass ejections (CMEs) and other coronal loops, as it propagates from the Sun into the heliosphere during May 2007. The 3-D propagation path of the largest interplanetary CME (ICME) is determined from the observat…
Linking two consecutive nonmerging magnetic clouds with their solar sources
Zhukov, A. N.; Rodriguez, L.; Mandrini, C. H. +10 more
On 15 May 2005, a huge interplanetary coronal mass ejection (ICME) was observed near Earth. It triggered one of the most intense geomagnetic storms of solar cycle 23 (Dst peak = -263 nT). This structure has been associated with the two-ribbon flare, filament eruption, and coronal mass ejection originating in active region 10759 (NOAA …