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ionospheres

Posted inEditors' Highlights

Origin of Dawnside Subauroral Plasma Flows in Geomagnetic Storms

by Susan Trumbore 12 September 202218 October 2022

Geomagnetic storms induce fast plasma flows next to the aurora and affect space weather. Lin et al. explain the origin of a special “dawnside” plasma stream that occurs only during extreme storm events.

Global ROTI map focusing on the Asia-Oceania sector and two graphs showing Swarm C and Swarm B paths.
Posted inEditors' Highlights

Tonga Volcanic Eruption Produced Ionospheric Hole and ‘Bubbles’

by Huixin Liu 10 August 20229 September 2022

The 2022 Tonga volcano eruption altered the global ionosphere, creating a huge ionospheric hole locally near the epicenter and large-amplitude plasma bubbles remotely over the Asia-Oceania area.

NASA卫星拍摄到南太平洋汤加火山
Posted inResearch Spotlights

汤加火山引发电离层扰动

by Jack Lee 3 June 202230 November 2022

汤加火山喷发产生了影响深远的电离层扰动,其中一次扰动的初始速度高达950米每秒。

Figure 2 from the paper, showing a time series graph of amateur radio observations over the Continental United States and four maps showing data at selected universal times.
Posted inEditors' Highlights

Amateur Radio Observations Help Monitor Space Weather

by Gang Lu 17 May 20227 September 2022

Amateur radio observations provide a new method for studying large-scale ionospheric disturbances and HF communication impacts, and are important applications in ionospheric space weather monitoring.

Figures showing global distributions of calculated height-integrated Pedersen conductance and Hall conductance.
Posted inEditors' Highlights

Meteoric Ions Influence Conductance in the Jovian Ionosphere

by Viviane Pierrard 29 April 20227 September 2022

Meteoric ions dominate the Jovian lower ionosphere due to their long lifetimes. Due to the large densities of the meteoric ions, conductance is enhanced independently of local time.

The explosive eruption of Hunga Tonga–Hunga Ha’apai in the South Pacific
Posted inResearch Spotlights

Tonga Eruption Made Waves in Earth’s Ionosphere

by Jack Lee 21 April 202230 November 2022

The blast from Hunga Tonga–Hunga Ha’apai produced far-reaching ionospheric disturbances, including one with an initial speed up to 950 meters per second.

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 202111 August 2022

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.

Graphic showing the path of GOLD over the Americas measuring the emission from atomic oxygen in an excited state at nighttime.
Posted inEditors' Highlights

GOLD Sees Quasi-Stationary Waves in the Nighttime Ionosphere

by Astrid Maute 12 March 202111 March 2021

The wave-like features in the pre-midnight ionosphere are not moving, vary strongly from day-to-day, and are often associated with the equatorial plasma bubbles, but their origin is still unknown.

Posted inEditors' Highlights

Citizen Scientists Observe Mysterious Green Streaks Below STEVE

by Mary Hudson 9 November 202015 March 2023

Citizen scientists provided images of sub-auroral STEVE (Strong Thermal Emission Velocity Enhancements) showing fine-scale green features with narrow streaks propagating poleward toward STEVE.

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Inside Volcanic Clouds: Where Tephra Goes and Why It Matters

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