Search Publications
Model of the Jovian magnetic field topology constrained by the Io auroral emissions
Bonfond, B.; Zarka, P.; Grodent, D. +1 more
The determination of the internal magnetic field of Jupiter has been the object of many studies and publications. These models have been computed from the Pioneer, Voyager, and Ulysses measurements. Some models also use the position of the Io footprints as a constraint: the magnetic field lines mapping to the footprints must have their origins alo…
The distribution of solar wind speeds during solar minimum: Calibration for numerical solar wind modeling constraints on the source of the slow solar wind
Arge, C. N.; Odstrcil, D.; Owens, M. J. +2 more
It took the solar polar passage of Ulysses in the early 1990s to establish the global structure of the solar wind speed during solar minimum. However, it remains unclear if the solar wind is composed of two distinct populations of solar wind from different sources (e.g., closed loops which open up to produce the slow solar wind) or if the fast and…
Polar coronal holes during the past solar cycle: Ulysses observations
Zurbuchen, Thomas H.; von Steiger, Rudolf
During its nearly 19-year mission, Ulysses pioneered novel measurements of the three-dimensional heliosphere and particularly in situ observations of high-latitude solar wind from polar coronal holes (PCHs). Winds from PCHs exhibit constant elemental abundances to within the limits of the measurements, indicative of the fact that such winds truly …
The influence of pickup protons, from interstellar neutral hydrogen, on the propagation of interplanetary shocks from the Halloween 2003 solar events to ACE and Ulysses: A 3-D MHD modeling study
Dryer, M.; Sun, W.; Intriligator, D. S. +3 more
We describe our 3-D, time-dependent, MHD solar wind model that we recently modified to include the physics of pickup protons from interstellar neutral hydrogen. The model has a time-dependent lower boundary condition, at 0.1 AU, that is driven by source surface map files through an empirical interface module. We describe the empirical interface an…
What causes the flux excess in the heliospheric magnetic field?
Smith, Edward J.
Ulysses results indicate that the total magnetic flux inside the heliosphere, Φ, can be obtained from the radial field component measured at a single spacecraft multiplied by the square of the radial distance and averaged over a solar rotation, < r2BR >. However, that result is contrary to a large increase in Φ with dis…
Periodicity analysis of Jovian quasi-periodic radio bursts based on Lomb-Scargle periodograms
Morioka, Akira; Tsuchiya, Fuminori; Misawa, Hiroaki +3 more
The Jovian polar magnetosphere has relativistic particle accelerations with quasi-periodicity (hereafter QP accelerations) that are accompanied by periodic auroral emissions and low-frequency radio bursts called quasi-periodic (QP) bursts. Some previous observations suggested a possible physical relationship between the QP accelerations and QP rad…
Size and amplitude of Langmuir waves in the solar wind
Malaspina, D. M.; Hess, S. L. G.; Ergun, R. E.
Langmuir waves in the solar wind are known to be the origin of many types of solar radio emissions. In situ observations have shown that the most intense Langmuir waves often appear as wave packets. Several models have been proposed to explain this localization, such as kinetic localization and eigenmode formation. In the present paper we investig…
Velocity profile of interplanetary coronal mass ejections beyond 1 AU
Lara, A.; Flandes, A.; Borgazzi, A. +1 more
We analyze the dynamics of interplanetary coronal mass ejections (ICMEs) through the interplanetary medium from the lower solar corona to ∼5.3 AU. Our analysis uses a one-dimensional hydrodynamical model derived from the fluid equation of motion that considers an effective drag force under both the laminar and turbulent hypotheses (low and high Re…