Search Publications
The Difference Between Isolated Flux Transfer Events and Flux Transfer Event Cascades
Karlsson, T.; Kullen, A.; Thor, S.
This flux transfer event (FTE) study is based on 984 FTEs originally identified by Wang et al. (2005, https://doi:10.1029/2005JA011150) in Cluster data. Due to Cluster's orbit, the FTE list exclusively contains events detected at the high-latitude dayside magnetopause and low-latitude flanks. The focu…
Plasma Transport in Saturn's Low-Latitude Ionosphere: Cassini Data
Wahlund, J. -E.; Waite, J. H.; Cravens, T. E. +7 more
In 2017 the Cassini Orbiter made the first in situ measurements of the upper atmosphere and ionosphere of Saturn. The Ion and Neutral Mass Spectrometer in its ion mode measured densities of light ion species (H+, H2+, H3+, and He+), and the Radio and Plasma Wave Science instrument m…
Enhanced Ionization in Magnetic Anomaly Regions of the Martian Lower Ionosphere Associated With Dust Storms
Haider, S. A.; Venkateswara Rao, N.; Leelavathi, V. +2 more
The Mars Advanced Radar for Subsurface and Ionospheric Sounding instrument aboard the Mars Express spacecraft observes vertical echoes from the normal ionosphere and oblique echoes from ionization bulges. The peak frequencies of these two kinds of echoes are, in general, nearly equal. In the present study, we report the detection of oblique echoes…
Equatorial Magnetosonic Waves Observed by Cluster Satellites: The Chirikov Resonance Overlap Criterion
Aryan, Homayon; Walker, Simon N.; Balikhin, Michael A. +1 more
Magnetosonic waves play an important role on the overall dynamics of relativistic radiation belt electrons. Numerical codes modeling the evolution of the radiation belts often account for wave-particle interaction with magnetosonic waves. The diffusion coefficients incorporated in these codes are generally estimated based on the results of statist…
South-North Hemispheric Asymmetry of the FAE Distribution Around the Cusp Region: Cluster Observation
Dunlop, Malcolm; Carr, Chris; Torkar, Klaus +5 more
Cluster data from late July to early October were used to study the distribution of field-aligned electron (FAE) events around the two cusps. An FAE event was defined as electron parallel flux >3 × 108 (cm2 s)-1. The total number of FAE events around the two cusps was basically identical, but downward FAE events…
Correcting Parker Solar Probe Electron Measurements for Spacecraft Magnetic and Electric Fields
Whittlesey, Phyllis; Kasper, Justin; Larson, Davin +2 more
The spacecraft body of the Parker Solar Probe may interfere with electron measurements in two ways. The first is the presence of several permanent magnets near the Solar Probe Analyzers (SPAN) instruments. The second is the widely varying spacecraft potential. We estimate the effect of these interferences by performing particle tracing simulations…
Multiple Scattering Effects in the Interplanetary Medium: Evaluation Using SOHO SWAN and MAVEN EUVM Lyman α Measurements
Quémerais, Eric; Schmidt, Walter; Thiemann, Edward +2 more
Interplanetary background measurements can be used to derive the solar flux that is illuminating the atoms in the interplanetary medium. We present a new algorithm combining measurements from the Solar Wind ANisotropies (SWAN)-Solar Heliospheric Observatory (SOHO) Lyman α photometer with Earth-based solar flux measurements to derive the solar illu…
A Method to Estimate the Physical Properties of Magnetospheric Generators From Observations of Quiet Discrete Auroral Arcs
Gunell, H.; De Keyser, J.; Lamy, H. +3 more
We discuss a method to estimate the properties of a magnetospheric generator using a quasi-electrostatic magnetosphere-ionosphere coupling model and in situ or remote sensing observations of discrete quiet arcs. We first construct an ensemble of Vlasov equilibrium solutions for generator structures formed at magnetospheric plasma interfaces. For e…
Localized Structures and Turbulent Spectra in the Magnetopause
Sharma, R. P.; Pathak, Neha; Uma, R.
Kinetic Alfvén wave (KAW) and whistler wave play a key role in the framework of turbulence and reconnection. There are lot of observations of these wave in the magnetopause region. The present paper deals with the nonlinear evolution of KAW and a weak whistler wave through the preexisting magnetic reconnection site. For this study the dynamical ev…
Conjunction Observations of Energetic Oxygen Ions O+ Accumulated in the Sequential Flux Ropes in the High-Altitude Cusp
Dandouras, I.; Reme, H.; Wang, Chi +5 more
Conjunction observations of the magnetic field and plasma by Cluster and TC-1 at the dayside magnetosphere are presented to investigate the sequential flux ropes transferred from the low latitude boundary layer to the high-altitude cusp on 10 March 2004.Three sequential flux ropes originating from the dayside low latitude magnetopause are first de…