Accounting for interhemispheric asymmetries in geospace models
Abstract
Hemispheric asymmetries in the Magnetosphere-Ionosphere-Thermosphere system are due to a myriad of factors with important impacts throughout the entire system. These asymmetries can be due to the solar wind By effect, asymmetries in precipitation, seasonal effects on conductance, asymmetric neutral winds, and asymmetric ion outflows. While some of these asymmetries are captured in current global models, many are not. In this presentation we will describe efforts as part of the Center for the Unified Study of Interhemispheric Asymmetries (CUSIA) to quantify the extent to which existing models capture the sources and impacts of asymmetry, and document new model developments to incorporate previously missing consequences of hemispheric asymmetry. The new model developments discussed include expanded coupling of the ring current to include the ionospheric potential from different hemispheres, the effect of asymmetric outflows on magnetotail and ring current composition, and the effect of asymmetric neutral winds on convection. Existing and newly improved codes are tested with both idealized and real event simulations with data comparisons to illustrate the extent to interhemispheric asymmetries impact the magnetosphere, and determine what is missing in in global models to fully capture these effects.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMSM037..04G
- Keywords:
-
- 2730 Magnetosphere: inner;
- MAGNETOSPHERIC PHYSICS;
- 2736 Magnetosphere/ionosphere interactions;
- MAGNETOSPHERIC PHYSICS;
- 2772 Plasma waves and instabilities;
- MAGNETOSPHERIC PHYSICS;
- 2778 Ring current;
- MAGNETOSPHERIC PHYSICS