Search Publications
Wave telescope technique for MMS magnetometer
Russell, C. T.; Glassmeier, K. -H.; Anderson, B. J. +18 more
Multipoint measurements are a powerful method in studying wavefields in space plasmas. The wave telescope technique is tested against magnetic field fluctuations in the terrestrial magnetosheath measured by the four Magnetospheric Multiscale (MMS) spacecraft on a spatial scale of about 20 km. The dispersion relation diagram and the wave vector dis…
On the origin of the ionosphere at the Moon using results from Chandrayaan-1 S band radio occultation experiment and a photochemical model
Choudhary, R. K.; Bhardwaj, Anil; Dhanya, M. B. +2 more
The origin of the Moon's ionosphere has been explored using Chandrayaan-1 radio occultation (RO) measurements and a photochemical model. The electron density near the Moon's surface, obtained on 31 July 2009 (∼300 cm-3), is compared with results from a model which includes production and recombination of 16 ions, solar wind proton charg…
Three-dimensional development of front region of plasma jets generated by magnetic reconnection
Nakamura, R.; Baumjohann, W.; Shinohara, I. +2 more
A three-dimensional fully kinetic particle-in-cell simulation of antiparallel magnetic reconnection is performed to investigate the three-dimensional development of reconnection jet fronts treating three instabilities: the lower hybrid drift instability (LHDI), the ballooning/interchange instability (BICI), and the ion-ion kink instability. Suffic…
Saturn's quasiperiodic magnetohydrodynamic waves
Coates, A. J.; Dougherty, M. K.; Hospodarsky, G. B. +11 more
Quasiperiodic ∼1 h fluctuations have been recently reported by numerous instruments on board the Cassini spacecraft. The interpretation of the sources of these fluctuations has remained elusive to date. Here we provide an explanation for the origin of these fluctuations using magnetometer observations. We find that magnetic field fluctuations at h…
Cluster observations of reflected EMIC-triggered emission
Santolík, O.; Cornilleau-Wehrlin, N.; Masson, A. +2 more
On 19 March 2001, the Cluster fleet recorded an electromagnetic rising tone on the nightside of the plasmasphere. The emission was found to propagate toward the Earth and toward the magnetic equator at a group velocity of about 200 km/s. The Poynting vector is mainly oblique to the background magnetic field and directed toward the Earth. The propa…
Mass wasting on Phobos triggered by an evolving tidal environment
Shi, X.; Oberst, J.; Willner, K.
The Martian moon Phobos is experiencing orbital decay, increasing tidal forces, and possible disruption in the near future. We suggest that this changing dynamic tidal environment has contributed to resurfacing of the odd-shaped small moon. We investigated mass wasting features in craters using high-resolution images acquired by the Mars Express o…
Cone angle control of the interaction of magnetic clouds with the Earth's bow shock
Escoubet, C. P.; Kilpua, E. K. J.; Turc, L. +2 more
We study the interaction of magnetic clouds (MCs) with the near-Earth environment. Recent works suggest that the bow shock crossing may modify significantly the magnetic structure of an MC, and thus its ability to drive geomagnetic storms. This change is largely controlled by the bow shock configuration, which depends on the upstream interplanetar…
Generation of He+ and O+ EMIC waves by the bunch distribution of O+ ions associated with fast magnetosonic shocks in the magnetosphere
Lee, L. C.; Lee, K. H.
Electromagnetic ion cyclotron (EMIC) waves are often observed in the magnetosphere with frequency usually in the H+ and He+ cyclotron bands and sometimes in the O+ band. The temperature anisotropy, caused by injection of energetic ions or by compression of magnetosphere, can efficiently generate H+ EMIC …
Dipolarization front and current disruption
Lui, A. T. Y.
The modification of current density on the dawn-dusk cross section of the magnetotail with the earthward approach of a dipolarization front (DF) is examined through the recently published results of a three-dimensional (3-D) particle-in-cell (PIC) simulation. It is found that the current density intensifies by 37% abruptly within 1.5 ion gyrotime …
A case study of a density structure over a vertical magnetic field region in the Martian ionosphere
Gurnett, D. A.; Lundin, R.; Morgan, D. D. +3 more
One of the discoveries made by the radar sounder on the Mars Express spacecraft is the existence of magnetically controlled structures in the ionosphere of Mars, which result in bulges in the ionospheric electron density contours. These bulges lead in turn to oblique echoes, which show up as hyperbola-shaped features in the echograms. A hyperbola-…