Search Publications
Rotation period of Jupiter from the observation of its magnetic field
Russell, C. T.; Yu, Z. J.
To determine the Jovian internal rotation rate, historically one has used the repetition period (periodicity) of decametric and decimetric radio waves. The period with which decametric and decimetric radio waves recur on Jupiter (the System III period) was defined by the IAU in 1965 to be 9h 55m 29.71s, based on early radio astronomical data. A mo…
A magnetospheric generator driving ion and electron acceleration and electric currents in a discrete auroral arc observed by Cluster and DMSP
Roth, M.; De Keyser, J.; Maggiolo, R. +1 more
Simultaneous observations on April 28, 2001 by Cluster and DMSP-F14 reveal a stable discrete auroral arc and fluxes of field-aligned accelerated electrons and ions coincident with a magnetospheric plasma interface at an altitude of 4.5 RE in the dusk sector. We compare satellite data with a quasi-stationary magnetosphere-ionosphere coup…
Association of phyllosilicates and the inverted channel in Miyamoto crater, Mars
Wiseman, S. M.; McGuire, P. C.; Marzo, G. A. +4 more
The western floor of the Miyamoto crater in Sinus Meridiani on Mars exhibits both geomorphic and spectral evidence for aqueous history. It contains a sinuous and narrow ridge that is interpreted to be an inverted channel and is suggestive of past fluvial activity. Phyllosilicates occur in materials that are proximal to the paleochannel, but are no…
Thermal phase curves observed in Saturn's main rings by Cassini-CIRS: Detection of an opposition effect?
Altobelli, N.; Flandes, A.; Leyrat, C. +4 more
We report on thermal phase curve measurements of Saturn's main rings by the CIRS infrared spectrometer on-board the CASSINI spacecraft. The extensive data set acquired by Cassini since its insertion in orbit around Saturn provides for the first time spatially resolved temperature measurements over broad phase angle ranges and for different solar e…
Magnetosheath fluctuations at Venus for two extreme orientations of the interplanetary magnetic field
Zhang, T. L.; Wang, C.; Baumjohann, W. +3 more
Using the magnetosheath crossings of Venus Express on two consecutive days, we investigate magnetic fluctuations in the same locations for two extreme interplanetary magnetic field orientations, i.e., nearly along and nearly perpendicular to the solar wind flow. It is shown that the properties of the fluctuations are drastically different at basic…
Radial and latitudinal gradients of anomalous cosmic ray oxygen in the inner heliosphere
Mewaldt, R. A.; Cummings, A. C.; Marsden, R. G. +2 more
We use data from the Ulysses, Advanced Composition Explorer, and Solar Terrestrial Relations Observatory spacecraft to determine the radial and latitudinal gradients of anomalous cosmic ray oxygen in two energy ranges from 4.5-15.6 MeV/nuc in the inner heliosphere for the first time during an A<0 part of the solar cycle. Using measurements from…
Cavities of weak magnetic field strength in the wake of FTEs: Results from global magnetospheric MHD simulations
Toth, G.; Hesse, M.; Wang, Y. +4 more
We use the global magnetohydrodynamic (MHD) code BATS-R-US to model multipoint observations of Flux Transfer Event (FTE) signatures. Simulations with high spatial and temporal resolution predict that cavities of weak magnetic field strength protruding into the magnetosphere trail FTEs. These predictions are consistent with recently reported multi-…
“Hook” structure in MARSIS ionogram and its interpretation
Wang, X. -D.; Zou, H.; Wang, J. -S. +1 more
MARSIS/MEX is a low frequency radar used to sound the ionosphere of Mars. In general the echo trace associated with reflections in nadir indicates an ionosphere with a main maximum electron density at typically about 130 km altitude, and a monotonously decreasing density with increasing altitude. Another maximum is sometimes detected at higher alt…
Modeling the response of the induced magnetosphere of Venus to changing IMF direction using MESSENGER and Venus Express observations
Boardsen, Scott A.; Gloeckler, George; Ho, George C. +14 more
The second MESSENGER flyby of Venus on 5 June 2007 provided a new opportunity to study the response of the induced magnetosphere of the planet to changes in the direction of the interplanetary magnetic field (IMF). At the time of the MESSENGER flyby, the European Space Agency's Venus Express spacecraft was located outside the magnetosphere and pro…
Solar wind periodicity in energetic electrons at Saturn
Krupp, N.; Krimigis, S. M.; Mitchell, D. G. +2 more
Fluxes of energetic electrons (110-365 keV) have been subjected to a long-term Lomb periodogram analysis from the middle of 2004 to the middle of 2009. Fluxes within 20 RS and outside the magnetopause were excluded, so only fluxes within the magnetosphere were included in the analysis. The periodicity “box” was expanded from 5 hours to …