We studied localized Pc 4 pulsations in the pre-midnight inner magnetosphere observed by Van Allen Probe B on May 1 2013. Although we attribute the pulsations to a drift-bounce resonance, we demonstrate that the energy-dependent response of the ion fluxes result from pulsation-associated velocities sweeping energy-dependent radial ion flux gradients back and forth past the spacecraft.

The different electric current systems flowing in the near-Earth nightside magnetosphere each have a unique contribution to the magnetic and electric field distortion of geospace. This study quantifies the intensity and timing of five current systems as calculated from 90 storm events using an inner magnetospheric drift physics model. There is a systematic progression through the various current systems, leading to implications for nonlinear feedback on the geospace system.

This paper reports the first experimental observation of stimulated Brillouin scattering near the third electron gyro-harmonic induced by high-frequency, high-power radio waves at EISCAT. The stimulated Brillouin scattering has also been correlated with simultaneous observations of the field-aligned irregularities and electron temperature. The observed stimulated Brillouin scattering becomes enhanced for pumping near electron gyro-harmonics.

A non-typical 1-4 kHz hiss was studied. It shows a sequence of separated noise bursts with strange “mushroom-like” shapes in the frequency-time domain, each lasting several minutes. This sequence could be a result of the modulation of the VLF hiss electron-cyclotron instability by Pc5 geomagnetic pulsations. This strange “mushroom-like” shape of the considered VLF hiss could be a combined mutual effect of the magnetospheric ULF-VLF wave interaction and the ionosphere waveguide propagation.

We reconsider the interaction of waves in a magnetized plasma, with a focus on the solar wind. The importance of a kinetic description, taking the detailed velocity distribution of electrons and ions into account, is emphasized. Our result for the coupling strength between different wave modes agrees with previous results in the limiting case when kinetic effects are negligible, however.

The magnetic profile of a laminar collisionless shock is described within two-fluid plasma theory. This description is valid only for the upstream part of the shock, before the ions begin to gyrate strongly. The emerging structure is fairly universal in a wide range of shock angles and mainly depends on the ratio of the dissipative to the dispersive length.

Large-amplitude radio waves lead to the structuring of the ionospheric plasma into groups magnetic field-aligned density cavities, or striations. A large part of the electromagnetic wave with ordinary mode polarization is then mode converted into upper hybrid waves trapped in the striations, further enforcing the striations. This simulation study investigates numerically this mode conversion and leakage of the the upper hybrid waves to back to electromagnetic waves in the Z-mode branch.

We present a first report on magnetic field measurements made in the coma of comet 67P/C-G in its low-activity state. The plasma environment is dominated by quasi-coherent, large-amplitude, compressional magnetic field oscillations around 40mHz, differing from the observations at strongly active comets where waves at the cometary ion gyro-frequencies are the main feature. We propose a cross-field current instability associated with the newborn cometary ions as a possible source mechanism.

In this paper inter-annual variability of tropospheric air temperature over the Asian summer monsoon region during the pre-monsoon months is examined in relation to Indian summer monsoon rainfall (ISMR; June to September total rainfall). The results indicate a strong and significant northwest–southeast dipole structure in the spatial correlations over the Indian region with highly significant positive (negative) correlations over the regions of north India and the western Tibetan Plateau region.

We investigate the precipitated-to-trapped flux ratio patterns near the proton isotropy boundary (IB) using NOAA-POES observations. For 30 and 80keV proton energies, we found only 31% of events showing the dispersion pattern predicted by the non-adiabatic scattering in the tail current sheet. Most frequent pattern had no measureable IB energy dispersion (63%); structured IBs with a few Jprec/Jtrap dropouts were also usual (60%). Roles of current sheet and wave-induced scattering are discussed.