Seasonal Dependence of Equatorial Electrodynamic Effects During Stratospheric Warming Periods

Details Seasonal Dependence of Equatorial Electrodynamic Effects During Stratospheric Warming Periods Seasonal Dependence of Equatorial Electrodynamic Effects During Stratospheric Warming Periods

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa23a1787o&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA23A-1787

Other

[2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2437] Ionosphere / Ionospheric Dynamics, [2494] Ionosphere / Instruments And Techniques, [3369] Atmospheric Processes / Thermospheric Dynamics

Scientific paper

Sudden stratospheric warming (SSW) events are known to give rise to large global equatorial electrodynamic perturbations. These effects have been studied mostly during December solstices. We study the equatorial electrodynamic response to SSW events during December solstice winter and equinoctial periods using Jicamarca vertical plasma drifts and equatorial electrojet current densities derived from CHAMP satellite measurements. During December solstice, our data typically show largely enhanced morning upward drifts and eastward electrojet currents along with afternoon downward drifts and westward currents. This perturbation pattern occurs near new and full moons and shifts to later local times with increasing lunar age. On the other hand, the morning and early afternoon upward drifts and eastward currents are enhanced during equinoctial warmings following new and full moons, but there are no noticeable decreases in the afternoon drifts and electrojet currents. This pattern also shifts to later local times with increasing lunar age. Arctic and Antarctic warming equinoctial warming events seem to give rise to nearly identical equatorial electrodynamic perturbation patterns. The CHAMP satellite data show that solstice and equinoctial SSW perturbations occur first in the western hemisphere. The satellite data also show strong two-day wave activity that generally occurs before and during both solstice and equinoctial warming events.

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