We consider the effect of field-aligned voltages on the magnetosphere-ionosphere coupling current system associated with the breakdown of rigid corotation of equatorial plasma in Jupiter’s middle magnetosphere. Previous analyses have assumed perfect mapping of the electric field and flow along equipotential field lines between the equatorial plane and the ionosphere, whereas it has been shown t...

Aims. Searching for planets in the atmosphere of AGB stars is difficult, due to confusion with the stellar wind and pulsations. The aim here is to provide a complementary strategy for planet searches in such a dense environment. Methods. The polarization properties of SiO masers, especially their circular polarization, are, under certain conditions, good tracers of rapid magnetospheric events. ...

[1] The Moon spends 25% of its orbit within the terrestrial magnetosphere. The magnetic field from the terrestrial magnetosphere can potentially provide radiation shielding from solar energetic particle events and lower energy galactic cosmic rays, which can be a significant hazard during extra-vehicle activities or during human exploration of the lunar surface. The level of shielding provided ...

[1] There has been an impression for more than half a century that reductions in the north-south component of the Earth’s magnetic field in the polar region (often called ‘‘negative magnetic bays’’ or ‘‘polar magnetic bays’’) may occur immediately after compression of the magnetosphere by interplanetary (IP) shock impacts, in particular when the magnetosphere is ‘‘preconditioned’’ by southward ...

originates from the Sun and expands radially into the interplanetary space. As it encounters the various bodies in the solar system it creates a variety of disturbances depending on the effective size of the obstacle. Two measures are important: the gyroradius, ρi, is the radius of the particle orbit around the magnetic field (B) due to the Lorentz force, and is given by ρ= vth /Ω= vthm / qB, w...

Observations from two recent space missions, the Active Magnetospheric Particle Tracer Explorers (AMPTE) and the Combined Release and Radiation Effects Satellite (CRRES), demonstrated that magnetospheric O + ions originating in the ionosphere are important terrestrial agents in geospace. In other words, the two missions showed that ionized oxygen escaping from the upper atmosphere, can play a c...

A correlation dimension analysis of the AE index indicates that the magnetosphere behaves as a lowdimensional chaotic system with a dimension close to 4. Similar techniques are used to determine if the system's behavior is due to an intrinsic sensitivity to initial conditions and thus is truly chaotic. The quantity used to measure the sensitivity to initial conditions is the Lyapunov exponent. ...