Search Publications

Nonlinear gyrokinetic theory for steady-state mirror mode magnetic structures

Jovanović, D.; Shukla, P. K.

The analytic study of the saturated state of the mirror instability is presented. The perpendicular ion momentum is described by the hydrodynamic equations, with the finite Larmor radius corrections found from the collisionless stress tensor, while the ion density, the parallel flow, and the pressure are calculated using the gyrokinetic descriptio…

Kinetic properties of coronal mass ejections corrected for the projection effect in Cycle 23

Gao, Peng-Xin; Li, Ke-Jun; Li, Qi-Xiu

Using Howard et al.'s method, we investigate, before and after the projection correction, the speed and acceleration distributions for 1747 coronal mass ejections (CMEs) associated solely with flares (FL CMEs) and 631 CMEs associated solely with filament eruptions (FE CMEs) observed by the Large Angle and Spectrometric Coronagraph on board the Sol…

On-disk signatures of eruptive activity from the Hinode mission

Harra, Louise K.

On-disk signatures of eruptive activity have been investigated for many years. These include filament eruptions, flares, coronal waves and dimmings. The Hinode mission is providing a new perspective on eruptive activity on the Sun and its linkage to the Earth. Despite being in a period of solar minimum since the launch of Hinode in September 2006,…

The comparative analytical performance of the Beagle 2 X-ray Spectrometer forin situgeochemical analysis on Mars

Talboys, D. L.; Butcher, G.; Fraser, G. W. +2 more

Acceleration of the anomalous component of cosmic rays revisited

Hilchenbach, M.; Kallenbach, R.; Bamert, K.

In the years 2004 and 2007, the instruments onboard the Voyager 1 and 2 spacecraft delivered unprecedented data on the structure of the solar wind termination shock. This shock has been assumed to be responsible for the acceleration of the anomalous component of cosmic rays from a pick-up ion seed population derived from the interstellar neutral g…

Evolutionary Status of 85 Pegasi

Lee, J.; Demarque, P.; Kim, Y. -C. +1 more

We have investigated the evolutionary status of the visual binary 85 Peg (HD 224930) using a high-resolution spectroscopic analysis and the astrometric calibration of the stellar parameters. In spite of well-determined stellar parameters from HIPPARCOS astrometry and from spectroscopy, 85 Peg has for a long time revealed peculiar properties when a…

An Unusual Eclipsing Blue Straggler V8-NGC 6752

Thompson, I. B.; Kaluzny, J.; Rozyczka, M. +1 more

We report the analysis of a binary blue straggler in NGC 6752 with a short orbital period of 0.315 d and a W UMA-type light curve. We use photometric data spanning 13 years to place limits on the mass ratio (0.15≤q≤0.35), luminosity ratio (L₁/L₂≈4.0) and the ratio of the radii of the components (r₁/r₂≈2.…

MARSIS radar sounder observations in the vicinity of Ma'adim Vallis, Mars

White, Oliver L.; Stofan, Ellen R.; Heggy, Essam +6 more

The MARSIS radar experiment aboard the ESA Mars Express satellite has recorded several unusual reflections in the Ma'adim Vallis region of Mars. These reflections display a wide variety of morphologies which are very different from those of reflections seen beneath the Polar Layered Deposits, Medusae Fossae Formation and Dorsa Argentea Formation. …

Saturn's Exploration Beyond Cassini-Huygens

Dougherty, Michele K.; Guillot, Tristan; Read, Peter +2 more

For its beautiful rings, active atmosphere and mysterious magnetic field, Saturn is a fascinating planet. It also holds some of the keys to understanding the formation of our Solar System and the evolution of giant planets in general. While the exploration by the Cassini-Huygens mission has led to great advances in our understanding of the planet …

The role of E+A and post-starburst galaxies - II. Spectral energy distributions and comparison with observations

Kotulla, R.; Fritze, U.; Falkenberg, M. A.

In a previous paper, we have shown that the classical definition of E+A galaxies excludes a significant number of post-starburst galaxies. We suggested that analysing broad-band spectral energy distributions (SEDs) is a more comprehensive method to select and distinguish post-starburst galaxies than the classical definition of measuring equivalent…