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CMEs' Speed, Travel Time, and Temperature: A Thermodynamic Approach
Flandes, Alberto; Lara, Alejandro; Durand-Manterola, Hector J. +2 more
Due to their important role in space weather, coronal mass ejections or CMEs have been thoroughly studied in order to forecast their speed and transit time from the Sun to the Earth. We present a thermodynamic analytical model that describes the dynamics of CMEs. The thermodynamic approach has some advantages with respect to the hydrodynamic appro…
Energetic Electron Periodicities During the Cassini Grand Finale
Krupp, N.; Roussos, E.; Mitchell, D. G. +2 more
The Cassini F ring and Proximal orbits took the spacecraft closer to Saturn than any previous mission and allowed determination of energetic charged particles (E > 20 keV) in the inner magnetosphere of the planet. The periodicities of the energetic electrons show a remarkable consistency when analyzed using Lomb periodograms. From the beginning…
Solar Illumination Control of the Polar Wind
André, M.; Poedts, S.; Eriksson, A. I. +5 more
Polar wind outflow is an important process through which the ionosphere supplies plasma to the magnetosphere. The main source of energy driving the polar wind is solar illumination of the ionosphere. As a result, many studies have found a relation between polar wind flux densities and solar EUV intensity, but less is known about their relation to …
The formation of superdense plasma sheet in association with the IMF turning from northward to southward
Lavraud, Benoit; Thomsen, Michelle F.; Liang, En-Wei +3 more
We have studied two events in which relatively superdense plasma appeared near geosynchronous orbit after the interplanetary magnetic field (IMF) changed from a long period of northward condition to southward condition. We used the magnetosphere MHD model Open Geospace General Circulation Model to simulate these two events and compared the simulat…
Energy-banded ions in Saturn's magnetosphere
Thomsen, M. F.; Jackman, C. M.; Kurth, W. S. +3 more
Using data from the Cassini Plasma Spectrometer ion mass spectrometer, we report the first observation of energy-banded ions at Saturn. Observed near midnight at relatively high magnetic latitudes, the banded ions are dominantly H+, and they occupy the range of energies typically associated with the thermal pickup distribution in the in…
Electron temperature anisotropy associated to field-aligned currents in the Earth's magnetosphere inferred from Rosetta MIP-RPC observations during 2009 flyby
Henri, P.; Hamelin, M.; Béghin, C. +3 more
A new approach is proposed for data interpretation of the Mutual Impedance Probe (MIP) instrument from the Rosetta Plasma Consortium (RPC) during the 2009 Earth's flyby gravity assist through the magnetosphere, from dusk to dawn regions. The spacecraft trajectory of ±8 RE (Earth's radius) was crossing several structures of field-aligned…
A study of ionopause perturbation and associated boundary wave formation at Venus
Zhang, Tielong; Collinson, Glyn A.; Chong, Ghai Siung +3 more
Magnetometer and electron spectrometer data from Venus Express (VEX) are used to investigate the occurrence of boundary wave phenomenon occurring in the vicinity of the Venusian terminator. On 26 June 2006, VEX data show the ionosphere to be unmagnetized (≈0 nT), a common observation usually expected during solar maximum. This results in the respe…
Localization of whistler wave and turbulent spectra in the magnetotail region
Sharma, R. P.; Pathak, Neha; Sharma, Swati +2 more
Observations show that whistler waves play a very crucial role both in magnetic reconnection and turbulence. In this context, linear and nonlinear dynamical equations of whistler wave have been derived and further these equations have been solved numerically as well as semianalytically. For application purpose, magnetotail parameters have been cho…
Double-peaked core field of flux ropes during magnetic reconnection
Feng, Xueshang; Nakamura, Rumi; Wang, Rongsheng +2 more
A flux rope event observed in the magnetotail exhibits a double-peaked core field feature. The generation of such double-peaked feature within the flux rope is explored with Hall-MHD simulations and theoretical analysis based on multiple X line reconnection. Simulations with a guide field produce flux ropes bounded by two active X lines in the thi…
Relationship between electron field-aligned anisotropy and dawn-dusk magnetic field: Nine years of Cluster observations in the Earth magnetotail
Nakamura, R.; Artemyev, A.; Petrukovich, A. +1 more
We investigate the distribution and possible origins of thermal anisotropic electrons in the Earth's magnetotail, using 9 years of Cluster observations. We mainly focus on relation between electron anisotropy and Bz and By magnetic field components (in GSM coordinates). The anisotropy of electron population is characterized b…