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  • English  (2)
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  • English  (2)
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  • 1
    Publication Date: 2020-12-11
    Description: We investigate the forces and atmosphere‐ionosphere coupling that create atmospheric dynamo currents using two rockets launched nearly simultaneously on 4 July 2013 from Wallops Island (USA), during daytime Sq conditions with ΔH of −30 nT. One rocket released a vapor trail observed from an airplane which showed peak velocities of 〉160 m/s near 108 km and turbulence coincident with strong unstable shear. Electric and magnetic fields and plasma density were measured on a second rocket. The current density peaked near 110 km exhibiting a spiral pattern with altitude that mirrored that of the winds, suggesting the dynamo is driven by tidal forcing. Such stratified currents are obscured in integrated ground measurements. Large electric fields produced a current opposite to that driven by the wind, believed created to minimize the current divergence. Using the observations, we solve the dynamo equation versus altitude, providing a new perspective on the complex nature of the atmospheric dynamo.
    Language: English
    Type: info:eu-repo/semantics/article
    Format: application/pdf
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  • 2
    Publication Date: 2023-07-07
    Description: Questions addressing Arctic change span earthquakes, meteorology, climate, sea ice, glaciers, permafrost, and wildfire. Many change-based research questions require consistent and continuous long-term data. By co-locating a wide variety of geophysical instruments, the Alaska Geophysics Network lends itself to enhancing cross-disciplinary research. Our stations co-locate: a 3-component broadband seismometer (Nanometrics T120PH or Kinemetrics STS-4B/5A); a Vaisala WXT weather station; a MEMS state-of-health barometer; a NCPA infrasound sensor; a SETRA microbarograph; and an Onset HOBO soil temperature profile. The stations were originally part of 192 multi-sensor platforms installed across Alaska between 2014 and 2017 by the USArray seismic project, managed by the Incorporated Research Institutions for Seismology (IRIS) as part of the NSF EarthScope program. These stations vastly expanded the amount of data available in Alaska and marked the first time seismic instruments were installed in some remote locations. Following the commencement of the USArray project, the Alaska Earthquake Center adopted the best-performing stations to become part of our permanent monitoring network. Data collected by the Alaska Geophysics Network can help explore questions related to climate, earthquakes, landslides, glaciers, sea ice, weather, wildfire, and more. All data is available for public use. In this presentation, we show the extent of the network and data and examples of cross-disciplinary cryoseismology findings from the Alaska Earthquake Center using this data.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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