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plasmas

Artist’s impression of China’s Tianwen-1 spacecraft en route to Mars.
Posted inEditors' Highlights

First Solar Wind Plasma Observations from the Tianwen-1 Mission

by Limei Yan 6 May 20224 May 2022

Solar wind plasma data captured by the Tianwen-1 probe while in transit to Mars represent an important step toward a new era of cooperative Martian space exploration.

Two plots showing the Cumulative probability of scintillation exceeding a certain value versus geomagnetic activity in July-December 2017.
Posted inEditors' Highlights

The Auroral E-region is a Source for Ionospheric Scintillation

by Michael P. Hickey 9 August 202128 September 2021

Observations reveal a connection between auroral particle precipitation and scintillation, indicating that the ionospheric E-region is a key source region for phase scintillation at auroral latitudes.

Plot showing K-H waves-related magnetic field variations correlated with the local geomagnetic B variations at Neumayer Station III.
Posted inEditors' Highlights

Satellite Data Reveal Magnetospause K-H Waves Impact Auroras

by Michael P. Hickey 5 August 202128 September 2021

Analysis of multiple satellite data has revealed a striking connection between K-H waves on the magnetopause, surface waves in the hot zone near the plasmapause, and auroral undulations.

Illustration showing the dayside magnetosphere and its surroundings
Posted inEditors' Vox

New Results Concerning Solar Wind Entry into the Magnetosphere

by D. G. Sibeck, Q. Zong, P. Escoubet, G. Le and H. Zhang 28 October 202010 March 2022

A new book describes recent results defining the many pathways and foreshock, bow shock, magnetosheath, and magnetopause phenomena connecting the solar wind to the dayside magnetosphere.

Radio towers at the VLF Transmitter Cutler in Maine
Posted inResearch Spotlights

Terrestrial Radio Signals May Suppress High-Energy Electrons

by Morgan Rehnberg 12 October 2020

Naval radio signals may cause the formation of a barrier observed during geomagnetic storms that is seemingly impenetrable by relativistic electrons.

A 2D drawing of Jupiter’s magnetosphere in the noon-midnight meridional plane
Posted inEditors' Highlights

A Whistle Here, There, and Everywhere on the Giant Planet

by A. Yau 27 August 202010 March 2022

NASA’s Juno spacecraft is “hearing whistles” all over the place on Jupiter, a type of natural plasma waves called whistlers that are sometimes associated with atmospheric lightning.

Plots recording observations of electromagnetic ion cyclotron waves at four different locations
Posted inEditors' Highlights

All Hands on Deck to Catch Ion Cyclotron Waves

by A. Yau 7 August 202023 July 2020

An international armada of orbiting satellites and ground VLF network join forces to form a “magnetosphere-ionosphere observatory” to size up electromagnetic ion cyclotron waves in the magnetosphere.

NASA’s Mars Atmosphere and Volatile Evolution spacecraft orbits Mars and samples electrons behind the Martian bow shock in this artist’s rendition.
Posted inResearch Spotlights

Explaining the Missing Energy in Mars’s Electrons

by Mark Zastrow 11 November 201910 March 2022

Electrons energized and trapped at Mars were thought to lose energy inside the planet’s magnetosheath, but new research suggests a different explanation of spacecraft data.

Plots of average wave electric field power spectral densities on the nightside
Posted inEditors' Highlights

Human-made Emissions Modify Electron Space Environment

by Viviane Pierrard 2 August 201916 July 2019

Very Low Frequency transmitters used for communications with submarines modify the dynamics of energetic electrons in the inner radiation belt and the slot region.

Measurements of electron density from the COSMIC satellite
Posted inEditors' Highlights

Holistic Views of the Nighttime Ionosphere

by M. Liemohn 22 July 201916 July 2019

The nightside ionosphere, at latitudes away from the auroral zone, should have very little charged particle density, but it doesn’t. A new comprehensive study of satellite data explains why.

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