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  1. ; ; ; ; ; ; ( , Proceedings of the 24th International Congress on Acoustics (ICA))
    Choi, Jee Woong ; Cho, Wan-Ho (Ed.)
    A. Chang*, S.R.V. Chabot, J. Mathews*, S. Briggs, T. Strzalkowski, M. Si, J. Braasch (2022) A spatially-aware companion system for language learning and foreign-language dialogue, In: Proceedings of the 24th International Congress on Acoustics (ICA), October 24–28, Gyeongju, Korea, Paper No. ABS-0631 (A-21, Virtual Acoustics), p. 67–76, https://www.ica2022korea.org/data/Proceedings_A21.pdf Full program -- see: https://www.ica2022korea.org/sub_proceedings.php 
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    Accepted Manuscript Full Text Available
  2. ; ; ; ( , Journal of Environmental Engineering)
    Full Text Available 
  3. ; ; ; ; ; ; ( , Physical Review B)
  4. ; ; ; ; ; ; ( , Geophysical Research Letters)
    Abstract

    This paper presents the first high‐resolution resonance lidar measurements of calcium ion (Ca+) layers in theFregion valley (140–180 km) over Arecibo. Unique, simultaneous Ca+, neutral sodium (Na), and potassium (K) lidar observations, along with incoherent scatter radar electron concentration (Ne) covering 80‐ to 180‐km altitudes for three consecutive nights, are reported here. AtEregion altitudes, the Ca+distribution follows sporadicEactivity on these nights. Thin Ca+layers (widths < 150 m) imply wind reversals to be occurring over this short height range. Ca+above 140 km do not always correspond to Nelayers but are detected only during presunrise hours. The average Ca+column abundance below 120 km is highly variable but during high‐altitude Ca+event decreases by a factor of 2 above 120 km. Both Neand Ca+display similar descent rates of ~7 m/s at altitudes >150 km during these events.

     
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  5. ; ; ; ; ; ; ( , Physical Review B)