Simultaneous storm time equatorward and poleward large‐scale TIDs on a global scale
Abstract
We report on the first simultaneous observations of poleward and equatorward traveling ionospheric disturbances (TIDs) during the same geomagnetic storm period on a global scale. While poleward propagating TIDs originate from the geomagnetic equator region, equatorward propagating TIDs are launched from the auroral regions. On a global scale, we use total electron content observations from the Global Navigation Satellite Systems to show that these TIDs existed over South American, African, and Asian sectors. The American and African sectors exhibited predominantly strong poleward TIDs, while the Asian sector recorded mostly equatorward TIDs which crossed the geomagnetic equator to either hemisphere on 9 March 2012. However, both poleward and equatorward TIDs are simultaneously present in all three sectors. Using a combination of ground‐based magnetometer observations and available low‐latitude radar (JULIA) data, we have established and confirmed that poleward TIDs of geomagnetic equator origin are due to ionospheric electrodynamics, specifically changes in E × B vertical drift after the storm onset.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 02, 2016
- Source ID
- 10.1002/2016gl069740
Entities
People
- Endawoke Yizengaw
- Gopi K Seemala
- John Bosco Habarulema
- Yosuke Yamazaki
- Zama Thobeka Katamzi
Organizations
- Air Force Office of Scientific Research
- Boston College
- Indian Institute of Geomagnetism
- National Science Foundation
- Rhodes University
- South African National Space Agency
- University of Lancaster