New Characteristics of Quasi-6-Day Wave Modulations in Ionosphere during the 2019 Antarctic Sudden Stratospheric Warming by Using Global Ionosphere Specification
Abstract
This study investigates new characteristics of ionospheric variations driven by quasi-6-day wave (Q6DW) burst following a rare and intense Antarctic sudden stratospheric warming (SSW) in September 2019. Local-time and vertical variations of amplitude and phase of Q6DW modulations of ionosphere during SSW are examined for the first time by using data-assimilated three-dimensional Global Ionosphere Specification (GIS) electron density. The GIS assimilates both FORMOSAT-7 radio occultation and ground-based GPS slant total electron content (TEC) to construct hourly electron density. The results show maximum amplitudes of Q6DW sit symmetrically ±20° off the magnetic equator ~12 LT followed a secondary peak at 17 LT. At 15 LT, the weakened amplitude and sudden phase shift of Q6DW suggests the ionosphere variations driven by multiple dynamo processes. Altitude-latitude structure shows Q6DW modulations extending beyond equatorial ionization anomaly, which indicates the dynamo effect should occur at higher latitudes off the equator. A plausible explanation is discussed based on interactions between Q6DW and other tidal winds leading to the phase differences and dynamo modulation.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMSA037..10L
- Keywords:
-
- 3369 Thermospheric dynamics;
- ATMOSPHERIC PROCESSES;
- 2411 Electric fields;
- IONOSPHERE;
- 7974 Solar effects;
- SPACE WEATHER