2009 Workshop:Equatorial ionosphere at storms
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Ionospheric electrodynamics and disturbances at middle and low latitudes during magnetic storms
Anasazi North, 1300-1500, 30 June 2009
Conveners
Chaosong Huang
Naomi Maruyama
Tim Fuller-Rowell
Workshop Categories
Altitudes: IT - Latitudes: equatorial - Inst/Model: satellite - Other:
Format of the Workshop
Short Presentations
Estimated attendance
40
Special technology requests
none
Description
The equatorial ionosphere is greatly disturbed and becomes extremely turbulent during intense magnetic storms. The dayside ionospheric plasma density and TEC at middle latitudes can be increased by a factor of 5-10. The F-region plasma density in the evening sector can be greatly reduced over ±20 deg magnetic latitudes. Large-scale plasma bubbles with density decrease of 2-3 orders of magnitude occur in the evening equatorial ionosphere during the main phase of magnetic storms, and the occurrence of plasma bubbles is greatly suppressed during the storm recovery phase. Although significant progress has been achieved in recent years, the storm-time equatorial ionospheric electrodynamics has not been well understood. The ionospheric electric fields have two major sources: the dynamo electric field generated by disturbance neutral winds and the penetration electric field originating from the solar wind. The interplanetary magnetic field can be continuously southward for many hours during the storm main phase and produce strong penetration electric fields in the equatorial ionosphere. The dynamo electric fields become important in the equatorial region at later times. In this workshop, we will present the latest observational and simulation results and discuss the following topics:
- How long and how much can the interplanetary electric field penetrate into the equatorial ionosphere during magnetic storms?
- What are the response time and effect of the shielding process?
- What are the response time and characteristics of the storm-time dynamo eletric fields?
- What is the interplay between the penetration and dynamo electric fields?
- How can the sources of the low-latitude ionospheric electric fields be identified?
- How do magnetic storms affect the generation of equatorial plasma bubbles?
- How do magnetic storms cause the redistribition of the low-latitude ionospheric plasma?
- What is the solar cycle dependence of storm-time electric fields?
Speakers:
- Michael Kelley (Cornell): Local time dependence of prompt penetrating electric fields and its influence on Convective Ionospheric Storms,
- Chaosong Huang (BC): The maximum duration of penetration electric fields during intense magnetic storms,
- Art Richmond (NCAR): Modeling disturbed equatorial electric fields,
- Wenbin Wang (NCAR): Commonalities in the response of ionosphere to the initial phase of geomagnetic storms,
- Naomi Maruyama (NOAA): Numerical modeling of the storm time ionospheric electrodynamics,
- Dave Anderson (NOAA): Examining the effects of geomagnetic storms on the pre-reversal enhancement in ExB drift velocities and the occurrence of ionospheric bubbles,
- Cesar Valladares (BC): TEC observations in South America during super-storms,
- Hyosub Kil (JHU/APL): Storm-induced big bubbles during the 29–30 October 2003 storm,
- Gang Lu (NCAR): Thermospheric storm effects by neutral wind dynamo.
Workshop Summary
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