Blar i forfatter "Rideout, William"

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    • 2022 Tonga Volcanic Eruption Induced Global Propagation of Ionospheric Disturbances via Lamb Waves 

      Zhang, Shun-Rong; Vierinen, Juha; Aa, Ercha; Goncharenko, Larisa P.; Erickson, Philip J.; Rideout, William; Coster, Anthea J.; Spicher, Andres (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-23)
      The Tonga volcano eruption at 04:14:45 UT on 2022-01-15 released enormous amounts of energy into the atmosphere, triggering very significant geophysical variations not only in the immediate proximity of the epicenter but also globally across the whole atmosphere. This study provides a global picture of ionospheric disturbances over an extended period for at least 4 days. We find traveling ionospheric ...

    • Conjugate ionospheric perturbation during the 2017 solar eclipse 

      Zhang, Shunrong; Erickson, Philip J.; Vierinen, Juha; Aa, Ercha; Rideout, William; Coster, Anthea; Goncharenko, Larisa (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-16)
      We report new findings of total electron content (TEC) perturbations in the southern hemisphere at conjugate locations to the northern eclipse on August 21, 2017. We identified a persistent conjugate TEC depletion by 10%–15% during the eclipse time, elongating along magnetic latitudes with at least ∼5° latitudinal width. As the Moon's shadow swept southward, this conjugate depletion moved northward ...

    • GNSS Observations of Ionospheric Variations During the 21 August 2017 Solar Eclipse 

      Coster, A. J.; Goncharenko, Larisa; Zhang, Shun-Rong; Erickson, P. J.; Rideout, William; Vierinen, Juha (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-20)
      On 21 August 2017, during daytime hours, a total solar eclipse with a narrow ∼160 km wide umbral shadow occurred across the continental United States. Totality was observed from the Oregon coast at ∼9:15 local standard time (LST) (17:20 UT) to the South Carolina coast at ∼13:27 LST (18:47 UT). A dense network of Global Navigation Satellite Systems (GNSS) receivers was utilized to produce total ...

    • Ionospheric bow waves and perturbations induced by the 21 August 2017 solar eclipse 

      Zhang, Shun-Rong; Erickson, Philip j.; Goncharenko, Larisa; Coster, Anthea; Rideout, William; Vierinen, Juha (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-12-04)
      During solar eclipses, the Moon's shadow causes a large reduction in atmospheric energy input, including not only the stratosphere but also the thermosphere and ionosphere. The eclipse shadow has a supersonic motion which is theoretically expected to generate atmospheric bow waves, similar to a fast‐moving river boat, with waves starting in the lower atmosphere and propagating into the ionosphere. ...

    • Significant ionospheric hole and equatorial plasma bubbles after the 2022 Tonga volcano eruption 

      Aa, Ercha; Zhang, Shunrong; Erickson, Philip J.; Vierinen, Juha; Coster, Anthea J.; Goncharenko, Larisa P.; Spicher, Andres; Rideout, William (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-28)
      This paper investigates the local and global ionospheric responses to the 2022 Tonga volcano eruption, using ground-based Global Navigation Satellite System total electron content (TEC), Swarm in situ plasma density measurements, the Ionospheric Connection Explorer (ICON) Ion Velocity Meter (IVM) data, and ionosonde measurements. The main results are as follows: (a) A significant local ionospheric ...

    • Subauroral and polar traveling ionospheric disturbances during 7-9 September 2017 storms 

      Zhang, Shunrong; Erickson, Philip j.; Coster, Anthea; Rideout, William; Vierinen, Juha; Jonah, Olusegun; Goncharenko, Larisa (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-12-25)
      This study provides new scenarios for storm time traveling ionospheric disturbance excitation and subsequent propagation at subauroral and polar latitudes. We used ground‐based total electron content observations from Global Navigation Satellite System receivers combined with wide field, subauroral ionospheric plasma parameters measured with the Millstone Hill Incoherent Scatter Radar during strong ...

    • Traveling ionospheric disturbances and ionospheric perturbations associated with solar flares in September 2017 

      Zhang, Shun-Rong; Coster, Anthea; Erickson, Philip j.; Goncharenko, Larisa; Rideout, William; Vierinen, Juha (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-07-10)
      Solar flares provide strong impulsive radiation and energy injection to the sunlit upper atmosphere. The impact on the ionosphere is immense in spatial scale, and therefore, it is not immediately evident if dramatically elevated neutral heating can lead to excitation of acoustic gravity waves. Using primary observations from Global Navigation Satellite System differential TEC (total electron ...

    • Traveling Ionospheric Disturbances in the Vicinity of Storm-Enhanced Density at Midlatitudes 

      Zhang, Shunrong; Nishimura, Yukitoshi; Erickson, Philip J.; Aa, Ercha; Kil, Hyosub; Deng, Yue; Thomas, Evan; Rideout, William; Coster, Anthea J.; Kerr, Robert; Vierinen, Juha (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-08)
      This study provides first storm time observations of the westward-propagating medium-scale traveling ionospheric disturbances (MSTIDs), particularly, associated with characteristic subauroral storm time features, storm-enhanced density (SED), subauroral polarization stream (SAPS), and enhanced thermospheric westward winds over the continental US. In the four recent (2017–2019) geomagnetic storm ...