Search Publications
Spectral Structures of Jovian Broadband Kilometric Radiation Revealed by Cassini and Juno
Kurth, W. S.; Píša, D.; Fischer, G. +2 more
Cassini flew past Jupiter in 2000/2001, and Juno has been orbiting the gas giant since mid-2016. Here we focus on the spectral properties of Jovian broadband kilometric radiation (bKOM), and we classified them according to their slope in the time–frequency spectrum and distinguish four categories with negative, positive, mixed, or no slope in freq…
Influence of the Jovian Current Sheet Models on the Mapping of the UV Auroral Footprints of Io, Europa, and Ganymede
André, N.; Hue, V.; Rabia, J. +4 more
The in situ characterization of moon-magnetosphere interactions at Jupiter and the mapping of moon auroral footpaths require accurate global models of the magnetospheric magnetic field. In this study, we compare the ability of two widely-used current sheet models, Khurana-2005 (KK2005) and Connerney-2020 (CON2020) combined with the most recent int…
Variation in the Pedersen Conductance Near Jupiter's Main Emission Aurora: Comparison of Hubble Space Telescope and Galileo Measurements
Nichols, J. D.; Vogt, M. F.; Rutala, M. J. +1 more
We present the first large-scale statistical survey of the Jovian main emission (ME) to map auroral properties from their ionospheric locations out into the equatorial plane of the magnetosphere, where they are compared directly to in-situ spacecraft measurements. We use magnetosphere-ionosphere (MI) coupling theory to calculate currents from the …
Stream Interaction Regions in the Minimum of Solar Cycles 23 and 24
Aguilar-Rodriguez, E.; Corona-Romero, P.; Gonzalez-Esparza, J. A. +1 more
Stream interaction regions (SIRs) dominate the large-scale solar wind dynamics during the minimum of the solar cycle. The interaction of SIRs with the magnetosphere causes most of geomagnetic storms during this epoch. We used in-situ solar wind observations at 1 AU to study 62 SIRs detected in the interval 2007-2008 (minimum of cycle 23) and 61 SI…
Geocoronal Solar Wind Charge Exchange Process Associated With the 2006-December-13 Coronal Mass Ejection Event
Toriumi, Shin; Mitsuda, Kazuhisa; Yamasaki, Noriko Y. +1 more
We report the discovery of a geocoronal solar wind charge exchange (SWCX) event corresponding to the well-known 2006 December 13th coronal mass ejection (CME) event. Strong evidence for the charge exchange origin of this transient diffuse emission is provided by prominent non-thermal emission lines at energies of O7+, Ne9+, M…
Radial and Local Time Variations in the Thickness of Jupiter's Magnetospheric Current Sheet
Hospodarsky, G. B.; Khurana, K. K.; Paranicas, C. P. +1 more
The magnetic field observations from the Galileo, Ulysses, Voyager 1 and 2, and Pioneer 10 and 11 spacecraft are analyzed to understand the structures and thickness of the Jovian magnetospheric current sheet. Using a new technique that can determine the motion of the spacecraft relative to the current sheet, we have built the first global map of t…
Decadal and Annual Variations in Meteoric Flux From Ulysses, Wind, and SOFIE Observations
Malaspina, David; Hunziker, Silvan; Sterken, Veerle +3 more
Our solar system is filled with meteoric particles, or cosmic dust, which is either interplanetary or interstellar in origin. Interstellar dust (ISD) enters the heliosphere due to the relative motion of the sun and the interstellar flow. Interplanetary dust (IPD) comes primarily from asteroid collisions or comet sublimation, and comprises the bulk…
Pitch Angle Distribution of MeV Electrons in the Magnetosphere of Jupiter
Witasse, O.; Kollmann, P.; Nénon, Q. +3 more
The magnetosphere of Jupiter harbors the most extreme fluxes of MeV electrons in the solar system and therefore provides a testbed of choice to understand the origin, transport, acceleration, and loss of energetic electrons in planetary magnetospheres. Along this objective, the Pitch Angle Distribution (PAD) of energetic electrons may reveal signa…
Comparing and Contrasting the Properties of the Inner Heliosphere for the Three Most Recent Solar Minima
Downs, Cooper; Riley, Pete; Linker, Jon A. +2 more
The previous three solar cycles have ended in progressively more quiescent conditions, suggesting a continual slide into an ever deeper minimum state. Although the Sun's magnetic field is undoubtedly responsible for this quiescence, it is not clear how changes in its structure and strength modulate the properties of the solar wind. In this study, …
Electron Heat Flux in the Solar Wind: Generalized Approaches to Fluid Transport With a Variety of Skewed Velocity Distributions
Cranmer, Steven R.; Schiff, Avery J.
In the solar corona and solar wind, electron heat conduction is an important process that transports energy over large distances and helps determine the spatial variation of temperature. High-density regions undergoing rapid particle-particle collisions exhibit a heat flux described well by classical Spitzer-Härm theory. However, much of the helio…