Blar i Institutt for fysikk på forfatter "van Caspel, Willem Elias"
-
Atmospheric Tides in the Mesosphere and Lower Thermosphere: Meteor Radar Observations and Mechanistic Tidal Model Simulations
van Caspel, Willem Elias (Doctoral theses at NTNU;2022:131, Doctoral thesis, 2022)Atmospheric tides are global-scale waves whose periods are an integer fraction of a solar or lunar day. While the tides are primarily excited in the lower atmosphere, their amplitudes can become very large at high altitudes. ... -
Migrating tide climatologies measured by a high-latitude array of SuperDARN HF radars
van Caspel, Willem Elias; Espy, Patrick Joseph; Hibbins, Robert; McCormack, John (Peer reviewed; Journal article, 2020)This study uses hourly meteor wind measurements from a longitudinal array of 10 high-latitude SuperDARN high-frequency (HF) radars to isolate the migrating diurnal, semidiurnal, and terdiurnal tides at mesosphere–lower-t ... -
Transport of Nitric Oxide Via Lagrangian Coherent Structures Into the Top of the Polar Vortex
Harvey, Lynn V.; Datta-Barua, Seebany; Pedatella, Nicholas M.; Wang, Ningchao; Randall, Cora E.; Siskind, David E.; van Caspel, Willem Elias (Peer reviewed; Journal article, 2021)The energetic particle precipitation (EPP) indirect effect (IE) refers to the downward transport of reactive odd nitrogen (NOx = NO + NO2) produced by EPP (EPP-NOx) from the polar winter mesosphere and lower thermosphere ...