Search Publications
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…
Isolated High-Density Structures in Magnetic Anomaly Regions of the Martian Lower Ionosphere
Venkateswara Rao, N.; Leelavathi, V.; Mohanamanasa, P. +1 more
The occurrence of density structures in magnetic anomaly regions is one of the prominent features of the Martian ionosphere. These structures, in general, occur at altitudes above the main peak. In the present study, we analyze four cases of unusually strong oblique echoes that occur in magnetic anomaly regions and are observed by the Mars Express…
Oxygen Ion Butterfly Distributions Observed in a Magnetotail Dipolarizing Flux Bundle
Zhang, H.; Sun, W. J.; Fu, S. Y. +8 more
Cluster observed two intermittent oxygen ion (O+) flux enhancements with energy dispersions in a dipolarizing flux bundle, which is known as a region of enhanced northward magnetic field (Bz) embedded in the earthward high-speed flow. The flux enhancements of O+ show clear pitch angle dependences, which are termed …
Effect of Dust Storm and GCR Impact on the Production Rate of O3+ in MY 28 and MY 29: Modeling and SPICAM Observation
Haider, S. A.; Masoom, J.; Bougher, S. +1 more
We have developed a seasonally dependent energy loss model to calculate the zonally averaged production rates of O3+ due to impact of galactic cosmic rays in the dayside troposphere of Mars between solar longitudes (Ls) 0° and 360° at low latitudes (2°N, 2°S, 25°N, and 25°S), midlatitudes (45°N and 45°S), and high …