Search Publications
Role of oxygen ions in the formation of a bifurcated current sheet in the magnetotail
Veltri, P.; Zimbardo, G.; Greco, A. +1 more
Cluster observations in the near-Earth magnetotail have shown that sometimes the current sheet is bifurcated, i.e., it is divided in two layers. The influence of magnetic turbulence on ion motion in this region is investigated by numerical simulation, taking into account the presence of both protons and oxygen ions. The magnetotail current sheet i…
Possible wave modes of wideband nonthermal continuum radiation in its source region
Santolík, O.; Grimald, S.
Nonthermal continuum (NTC) electromagnetic radiation is generated within the Earth's magnetosphere and radiated to the outer space. We present cases of a specific type of NTC, which appears as multiple wide bands on the spectrograms recorded by the Cluster spacecraft just outside the plasmapause. This NTC comes from several sources located in the …
Longitude dependences of energetic H+ and O+ at Saturn
Krimigis, S. M.; Mitchell, D. G.; Carbary, J. F. +2 more
The charge-energy-mass spectrometer instrument in the Cassini spacecraft measured differential fluxes of protons (2.8-236 keV) and oxygen ions (8.8-236 keV) from July 2004 to August 2007. The fluxes were bin-averaged in Saturn longitude system (SLS) longitude within ±5 RS of the equator and between 8 and 12 RS in radial dista…
Comparisons between ion distributions retrieved from ENA images of the ring current and contemporaneous, multipoint ion measurements recorded in situ during the major magnetic storm of 15 May 2005
Barabash, S.; Liu, Z. X.; Brandt, P. C. +5 more
The Neutral Atom Detector Unit (NUADU) aboard the TC-2 spacecraft recorded energetic neutral atom (ENA) image data for >3 h during part of the main and recovery phases of a major magnetic storm on 15 May 2005. A custom designed, constrained linear inversion method was applied to retrieve ring current ion distributions in the ENA records out to …
Plasma conditions and the structure of the Jovian ring
Horányi, Mihály; Juhász, Antal
We explore the dynamics of small charged dust particles in Jupiter's innermost magnetosphere and show that the systematic charge variation of the grains results in surprisingly short lifetimes. Assuming a constant production of small dust particles via continual micrometeoroid bombardment of the larger parent bodies of the main ring, this model re…
A new approach for deriving the solar irradiance from nonflaring solar upper atmosphere plasmas at 2 × 104 ≤ T ≤ 2 × 107 K
Fontes, C. J.; Landi, E.; Doschek, G. A. +7 more
We propose a new approach for deriving the solar irradiance due to the emission by solar upper atmosphere plasmas at 2 × 104 ≤ T ≤ 2 × 107 K for wavelengths shorter than 800 Å. Our approach is based on a new understanding of the properties of the solar upper atmosphere; specifically, the discovery that the majority of emissio…
Timing of changes in the solar wind energy input in relation to ionospheric response
Janhunen, P.; McComas, D. J.; Palmroth, M. +3 more
We investigate four consecutive substorms using observations and global MHD simulation code GUMICS-4. The solar wind energy input is estimated by the epsilon parameter and evaluated from the simulation by direct integration of the energy transfer through the magnetopause. The ionospheric dissipation is estimated using the AE index and also evaluat…
Multisatellite low-altitude observations of a magnetopause merging burst
Wing, Simon; Liou, Kan; Newell, Patrick T. +3 more
A fortuitous multisatellite observation of a dayside merging event driven by a sharp southward interplanetary magnetic field (IMF) turning illuminates several ionospheric particle and auroral reconnection signatures. Shortly after the southward IMF turning, as propagated from ACE, DMSP F13 observed a region equatorward of the cusp emptied of magne…
Ring current formation influenced by solar wind substorm conditions
Cash, M. D.; Winglee, R. M.; Harnett, E. M.
Single-particle tracking with time-dependent global magnetic and electric fields is used to investigate the generation of the ring current from ionospheric outflows during an internally driven substorm. We show that the energization of the ions is not correlated with the time that the ions leave the ionosphere; instead energization is correlated w…
Acceleration of electrons in Titan's ionosphere
Khodachenko, M. L.; Rucker, H. O.; Panchenko, M. +2 more
A consideration of the acceleration mechanism which supplies the fast electrons to the source of Saturnian kilometric radiation (SKR) and an interpretation of the recently reported observational indications of the influence of Titan on the SKR are presented. The proposed mechanism operates by the effect of the different magnetization of the electr…