J. M. Weygand
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View article: Thermospheric Density Disturbances During the 2015 St. Patrick's Day Geomagnetic Storm: Model–Observation Comparisons and Analysis of Intense Polar Density Spikes
Thermospheric Density Disturbances During the 2015 St. Patrick's Day Geomagnetic Storm: Model–Observation Comparisons and Analysis of Intense Polar Density Spikes Open
Drag affecting satellites in low Earth orbit varies significantly during geomagnetic storms due to changes in thermospheric density. While neutral density can be inferred from satellite measurements, such data sets are limited and restrict…
View article: Evaluating the geomagnetic response to the May 2024 super storm – observations and interpretations
Evaluating the geomagnetic response to the May 2024 super storm – observations and interpretations Open
On 10 May 2024, a series of coronal mass ejections were detected at Earth followed by one of the most powerful geomagnetic storms since November 2003. Leveraging a multi–technique approach, this paper provides an account of the ground geom…
View article: Observations of traveling ionospheric disturbances driven by gravity waves from sources in the upper and lower atmosphere
Observations of traveling ionospheric disturbances driven by gravity waves from sources in the upper and lower atmosphere Open
The observed traveling ionospheric disturbances (TIDs) are attributed to atmospheric gravity waves generated by auroral sources in the lower thermosphere or gravity waves generated in the troposphere by midlatitude weather systems. TIDs ar…
View article: A Geographic Comparison of the Medical Physics Job Market and Accredited Residency Program Distribution
A Geographic Comparison of the Medical Physics Job Market and Accredited Residency Program Distribution Open
View article: All-Sky Imager and Geosynchronous Spacecraft Analysis of Nighttime Magnetic Perturbation Events Observed in Arctic Canada
All-Sky Imager and Geosynchronous Spacecraft Analysis of Nighttime Magnetic Perturbation Events Observed in Arctic Canada Open
View article: On the Swarm satellite thermosphere density observations during the 2015 St Patrick's Day geomagnetic storm
On the Swarm satellite thermosphere density observations during the 2015 St Patrick's Day geomagnetic storm Open
View article: Observation of Chaotic fluctuations in Turbulent Plasma
Observation of Chaotic fluctuations in Turbulent Plasma Open
Turbulence is a prevalent phenomenon in space and astrophysical plasmas, often characterized by stochastic fluctuations. While laboratory experiments and numerical simulations have revealed chaotic behavior, in-situ observations of turbule…
View article: Observations of traveling ionospheric disturbances driven by gravity waves from sources in the upper and lower atmosphere
Observations of traveling ionospheric disturbances driven by gravity waves from sources in the upper and lower atmosphere Open
Traveling ionospheric disturbances (TIDs) are observed by the Super Dual Auroral Radar Network (SuperDARN), the Poker Flat Incoherent Scatter Radar (PFISR), the multipoint and multifrequency continuous Doppler sounders, and the GNSS total …
View article: Occurrence of Large Geomagnetically Induced Currents Within the EPRI SUNBURST Monitoring Network
Occurrence of Large Geomagnetically Induced Currents Within the EPRI SUNBURST Monitoring Network Open
Space weather, a natural hazard, can adversely impact human technological assets. High‐voltage electric power transmission grids constitute one of the most critical technological systems vulnerable to space weather driven geomagnetically i…
View article: Signatures of Dipolarizing Flux Bundles in the Nightside Auroral Zone
Signatures of Dipolarizing Flux Bundles in the Nightside Auroral Zone Open
Dipolarizing flux bundles (DFBs) have been suggested to transport energy and momentum from regions of reconnection in the magnetotail to the high latitude ionosphere, where they can generate localized ionospheric currents that can produce …
View article: The Response of Ionospheric Currents to External Drivers Investigated Using a Neural Network‐Based Model
The Response of Ionospheric Currents to External Drivers Investigated Using a Neural Network‐Based Model Open
A predictive model for the variation of ionospheric currents is of great scientific and practical importance to our modern industrial society. To study the response of ionospheric currents to external drivers including geomagnetic indices …
View article: A Strategic Vision for Understanding Inter-Hemispheric Asymmetries
A Strategic Vision for Understanding Inter-Hemispheric Asymmetries Open
Whitepaper #438 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: space weather research/operations/research loop; ground-based missions/…
View article: Global Networks of Ground-Based Magnetometers Enable Cutting-Edge Heliophysics Research, Education, and Space Weather Operations
Global Networks of Ground-Based Magnetometers Enable Cutting-Edge Heliophysics Research, Education, and Space Weather Operations Open
Whitepaper #162 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: space weather research/operations/research loop; space weather research…
View article: Ground-based and additional science support for SMILE
Ground-based and additional science support for SMILE Open
The joint European Space Agency and Chinese Academy of Sciences Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) mission will explore global dynamics of the magnetosphere under varying solar wind and interplanetary magnetic field …
View article: Interhemispheric Asymmetry Due To IMF By Within the Cusp Spherical Elementary Currents
Interhemispheric Asymmetry Due To IMF By Within the Cusp Spherical Elementary Currents Open
Observations of interhemispheric asymmetry in the cusp region due to the interplanetary magnetic field (IMF) By component have been performed for years, but those observations typically are not simultaneous in both hemispheres and represen…
View article: Extreme Geomagnetic Disturbances (GMDs) Observed in Eastern Arctic Canada: Occurrence Characteristics and Solar Cycle Dependence
Extreme Geomagnetic Disturbances (GMDs) Observed in Eastern Arctic Canada: Occurrence Characteristics and Solar Cycle Dependence Open
Extreme (≥ 20 nT/s) geomagnetic disturbances (GMDs, also denoted as MPEs - magnetic perturbation events) – impulsive nighttime disturbances with time scale ~5-10 min, have sufficient amplitude to cause bursts of geomagnetically induced cur…
View article: Atmospheric gravity waves generated by solar wind high-speed stream Alfvén waves
Atmospheric gravity waves generated by solar wind high-speed stream Alfvén waves Open
Solar wind Alfvén waves in high-speed streams from coronal holes modulate dayside ionospheric convection and currents, including auroral electrojets [1]. They generate large- to medium-scale atmospheric gravity waves (AGWs) propagatin…
View article: Multiple Auroral Streamer Bundles in Conjugate Hemispheres and Multiple Near‐Earth Injections
Multiple Auroral Streamer Bundles in Conjugate Hemispheres and Multiple Near‐Earth Injections Open
The auroral streamer is a type of auroral form commonly observed during geomagnetic substorms. Previous studies suggested a coupling between auroral streamers and channels of bursty bulk flows in the plasma sheet. However, whether one flow…
View article: The 2021 Antarctic Total Eclipse: Ground Magnetometer and GNSS Wave Observations from the 40 Degree Magnetic Meridian
The 2021 Antarctic Total Eclipse: Ground Magnetometer and GNSS Wave Observations from the 40 Degree Magnetic Meridian Open
On December 04, 2021, a total solar eclipse occurred over west Antarctica. Nearly an hour beforehand, a geomagnetic substorm onset was observed in the northern hemisphere. Eclipses are suggested to influence magnetosphere-ionosphere (MI) c…
View article: Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere
Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere Open
During minor to moderate geomagnetic storms, caused by corotating interaction regions (CIRs) at the leading edge of high-speed streams (HSSs), solar wind Alfvén waves modulated the magnetic reconnection at the dayside magnetopause. The Res…
View article: Comment on egusphere-2022-850
Comment on egusphere-2022-850 Open
Abstract. We have examined the most intense external (magnetospheric and ionospheric) and internal (induced) |dH/dt| (amplitude of the 10 s time derivative of the horizontal geomagnetic field) eve…
View article: Comment on egusphere-2022-850
Comment on egusphere-2022-850 Open
Abstract. We have examined the most intense external (magnetospheric and ionospheric) and internal (induced) |dH/dt| (amplitude of the 10 s time derivative of the horizontal geomagnetic field) eve…
View article: Review of Environmental Monitoring by Means of Radio Waves in the Polar Regions: From Atmosphere to Geospace
Review of Environmental Monitoring by Means of Radio Waves in the Polar Regions: From Atmosphere to Geospace Open
The Antarctic and Arctic regions are Earth's open windows to outer space. They provide unique opportunities for investigating the troposphere–thermosphere–ionosphere–plasmasphere system at high latitudes, which is not as well understood as…
View article: Persistent pressure gradient as a driver of the substorm current wedge: A statistical study
Persistent pressure gradient as a driver of the substorm current wedge: A statistical study Open
The substorm current wedge (SCW) is believed to be driven by pressure gradients and vortices associated with fast flows. Therefore, it is expected that relevant observations are organized by the SCW’s central meridian, which cannot be dete…
View article: Reply on AC1
Reply on AC1 Open
Abstract. During minor to moderate geomagnetic storms, caused by corotating interaction regions at the leading edge of high-speed streams, solar wind Alfvén waves modulated the magnetic reconnection at the dayside magnetop…
View article: Reply on AC2
Reply on AC2 Open
During minor to moderate geomagnetic storms, caused by corotating interaction regions at the leading edge of high-speed streams, solar wind Alfvén waves modulated the magnetic reconnection at the dayside magnetopause. The Resolute Bay Inco…
View article: Investigation of the Differences in Onset Times for Magnetically Conjugate Magnetometers
Investigation of the Differences in Onset Times for Magnetically Conjugate Magnetometers Open
We have identified nearly 1,000 onsets using two pairs of hemispheric conjugate ground magnetometers where the onset is defined based on a sharp decline in the H component of the magnetic field at a ground magnetometer station. Specificall…
View article: Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere
Multi-instrument observations of polar cap patches and traveling ionospheric disturbances generated by solar wind Alfvén waves coupling to the dayside magnetosphere Open
During minor to moderate geomagnetic storms, caused by corotating interaction regions at the leading edge of high-speed streams, solar wind Alfvén waves modulated the magnetic reconnection at the dayside magnetopause. The Resolute Bay Inco…
View article: Multi-instrument observations of polar cap patches and traveling ionospheric disturbances during geomagnetic storms
Multi-instrument observations of polar cap patches and traveling ionospheric disturbances during geomagnetic storms Open
<p>Solar wind Alfvén waves [1] coupling to the magnetosphere-ionosphere-thermosphere (MIT) have been associated with high-intensity long-duration continuous auroral electrojet activity [2] and shown to modulate ionospheric c…
View article: Comment on angeo-2022-3
Comment on angeo-2022-3 Open
The magnetotail earthward fast flow bursts can transport most of the magnetic flux and energy into the inner magnetosphere. These fast flow bursts are generally an order of magnitude higher than the typical convection speeds, that are azim…