Search Publications
MARSIS remote sounding of localized density structures in the dayside Martian ionosphere: A study of controlling parameters
Gurnett, D. A.; Morgan, D. D.; Andrews, D. J. +2 more
Enhanced topside electron densities in the dayside Martian ionosphere have been repetitively observed in areas of near-radial crustal magnetic fields, for periods of tens of days, indicating their long-term spatial and temporal stability despite changing solar wind conditions. We perform a statistical study of these density structures using the io…
Acceleration of O+ from the cusp to the plasma sheet
Dandouras, I.; Klecker, B.; Kistler, L. M. +2 more
Heavy ions from the ionosphere that are accelerated in the cusp/cleft have been identified as a direct source for the hot plasma in the plasma sheet. However, the details of the acceleration and transport that transforms the originally cold ions into the hot plasma sheet population are not fully understood. The polar orbit of the Cluster satellite…
Dipole tilt angle effect on magnetic reconnection locations on the magnetopause
Zhang, H.; Wan, W. X.; Pu, Z. Y. +7 more
Plasma energy dispersion properties inside reconnection jet flows observed inside the low-latitude boundary layer are used to determine the distances of observing satellites to reconnection sites. The locations of the reconnection sites are then retrieved by tracing the modeled field lines by those distances. The controlling effects of the dipole …
Experimental determination of the dispersion relation of magnetosonic waves
Dandouras, I.; Walker, S. N.; Yearby, K. H. +4 more
Magnetosonic waves are commonly observed in the vicinity of the terrestrial magnetic equator. It has been proposed that within this region they may interact with radiation belt electrons, accelerating some to high energies. These wave-particle interactions depend upon the characteristic properties of the wave mode. Hence, determination of the wave…
An empirical approach to modeling ion production rates in Titan's ionosphere I: Ion production rates on the dayside and globally
Edberg, N. J. T.; Waite, J. H.; Cravens, T. E. +9 more
Titan's ionosphere is created when solar photons, energetic magnetospheric electrons or ions, and cosmic rays ionize the neutral atmosphere. Electron densities generated by current theoretical models are much larger than densities measured by instruments on board the Cassini orbiter. This model density overabundance must result either from overpro…
Space weather effects on the bow shock, the magnetic barrier, and the ion composition boundary at Venus
Kallio, E.; Szego, K.; Fraenz, M. +4 more
We present a statistical study on the interaction between interplanetary coronal mass ejections (ICMEs) and the induced magnetosphere of Venus when the peak magnetic field of the magnetic barrier was anomalously large (>65 nT). Based on the entire available Venus Express data set from April 2006 to October 2014, we selected 42 events and analyz…
Are 3-D coronal mass ejection parameters from single-view observations consistent with multiview ones?
Moon, Y. -J.; Jang, Soojeong; Lee, Harim +2 more
To prepare for when only single-view observations are available, we have made a test whether the 3-D parameters (radial velocity, angular width, and source location) of halo coronal mass ejections (HCMEs) from single-view observations are consistent with those from multiview observations. For this test, we select 44 HCMEs from December 2010 to Jun…
Hypervelocity dust impacts on the Wind spacecraft: Correlations between Ulysses and Wind interstellar dust detections
Horanyi, Mihaly; Andersson, Laila; Malaspina, David M. +1 more
The Wind spacecraft is positioned just sunward of Earth at the first Lagrange point, while the Ulysses spacecraft orbits above and below the ecliptic plane crossing the ecliptic as far from the Sun as the orbit of Jupiter (∼5 AU). While Wind does not carry a dedicated dust detector, we demonstrate the ability of Wind electric field measurements to…
Acceleration of ions to suprathermal energies by turbulence in the plasmoid-like magnetic structures
Daly, P. W.; Malykhin, A. Yu.; Grigorenko, E. E. +2 more
We study energetic spectra of H+, He+, and O+ ion fluxes in the energy range ≥130 keV measured by Cluster/Research with Adaptive Particle Imaging Detectors (RAPID) instruments during 37 intervals of the tailward bulk flow propagation in the near-Earth tail (at X ≤ -19 RE). In all events from our database…
Heavy-ion dominance near Cluster perigees
Kistler, L. M.; Zhang, J. -C.; Spence, H. E. +1 more
Time periods in which heavy ions dominate over H+ in the energy range of 1-40 keV were observed by the Cluster Ion Spectrometry (CIS)/COmposition DIstribution Function (CODIF) instrument onboard Cluster Spacecraft 4 at L values less than 4. The characteristic feature is a narrow flux peak at around 10 keV that extends into low L values,…