Search Publications
Martian magnetic storms
Luhmann, J. G.; Russell, C. T.; Li, Y. +11 more
The response of Mars to the major space weather events called interplanetary coronal mass ejections (ICMEs) is of interest for both general planetary solar wind interaction studies and related speculations on their evolutionary consequences—especially with respect to atmosphere escape. Various particle and field signatures of ICMEs have been obser…
Global Mars-solar wind coupling and ion escape
Barabash, Stas; Nilsson, Hans; Holmström, Mats +2 more
Loss of the early Martian atmosphere is often thought to have occurred due to an effective transfer of the solar wind energy through the Martian induced magnetic barrier to the ionosphere. We have quantified the coupling efficiency by comparing the power of the heavy ion outflow with the available power supplied by the upstream solar wind. Constra…
The occurrence and wave properties of EMIC waves observed by the Magnetospheric Multiscale (MMS) mission
Allen, R. C.; Deng, X. H.; Torbert, R. B. +5 more
Electromagnetic ion cyclotron (EMIC) waves can precipitate the ring current ions and relativistic electrons and heat the cold electrons in the magnetosphere. This requires comprehensive knowledge of the occurrence and wave properties of EMIC waves. In the present study, we used the data from one new mission, the Magnetospheric Multiscale (MMS) mis…
EMPIRE: A robust empirical reconstruction of solar irradiance variability
Solanki, S. K.; Yeo, K. L.; Krivova, N. A.
We present a new empirical model of total and spectral solar irradiance (TSI and SSI) variability entitled EMPirical Irradiance REconstruction (EMPIRE). As with existing empirical models, TSI and SSI variability is given by the linear combination of solar activity indices. In empirical models, UV SSI variability is usually determined by fitting th…
Simulation of VLF chorus emissions in the magnetosphere and comparison with THEMIS spacecraft data
Santolík, O.; Demekhov, A. G.; Taubenschuss, U.
We present results of numerical simulations of VLF chorus emissions based on the backward wave oscillator model and compare them with Time History of Events and Macroscale Interactions during Substorms (THEMIS) spacecraft data from the equatorial chorus source region on the early morning side at a radial distance of 6 Earth radii. Specific attenti…
Solar wind- and EUV-dependent models for the shapes of the Martian plasma boundaries based on Mars Express measurements
Barabash, Stas; Holmström, Mats; Futaana, Yoshifumi +1 more
The long operational life (2003-present) of Mars Express (MEX) has allowed the spacecraft to make plasma measurements in the Martian environment over a wide range of upstream conditions. We have analyzed ∼7000 MEX orbits, covering three orders of magnitude in solar wind dynamic pressure, with data from the on board Analyzer of Space Plasmas and En…
On the Dawn-Dusk Asymmetry of the Kelvin-Helmholtz Instability Between 2007 and 2013
Nykyri, K.; Moore, T. W.; Dimmock, A. P. +2 more
Using data from Time History of Events and Macroscale Interactions during Substorms (THEMIS), a statistical study was performed to determine whether a dawn-dusk asymmetry exists in the occurrence rates of the Kelvin-Helmholtz instability during Parker-Spiral (PS) and Ortho-Parker-Spiral (OPS) orientations of the interplanetary magnetic field (IMF)…
Timescales for the penetration of IMF By into the Earth's magnetotail
Milan, S. E.; Fear, R. C.; Grocott, A. +1 more
Previous studies have shown that there is a correlation between the By component of the interplanetary magnetic field (IMF) and the By component observed in the magnetotail lobe and in the plasma sheet. However, studies of the effect of IMF By on several magnetospheric processes have indicated that the By
Traveling Foreshocks and Transient Foreshock Phenomena
Omidi, N.; Blanco-Cano, X.; Kajdič, P. +3 more
We use the multispacecraft capabilities of the Cluster and Time History of Events and Macroscale Interactions during Substorms (THEMIS) missions to show that two types of foreshock may be detected in spacecraft data. One is the global foreshock that appears upstream of the Earth's quasi-parallel bow shock under steady or variable interplanetary ma…
The MMS Dayside Magnetic Reconnection Locations During Phase 1 and Their Relation to the Predictions of the Maximum Magnetic Shear Model
Russell, C. T.; Fuselier, S. A.; Strangeway, R. J. +12 more
Several studies have validated the accuracy of the maximum magnetic shear model to predict the location of the reconnection site at the dayside magnetopause. These studies found agreement between model and observations for 74% to 88% of events examined. It should be noted that, of the anomalous events that failed the prediction of the model, 72% s…