Table 1 Cause and effect relationship for substorm-associated aurora as suggested by the global MHD simulation
From: Simulation study of near-Earth space disturbances: 2. Auroral substorms
Substorm phase | Characteristics of aurora | Possible cause |
|---|---|---|
Growth phase | Quiet arc | Flow shear at off-equator (Tanaka et al., 2017a) |
High-latitude aurora within main auroral oval | Non-linear interaction between magnetosphere and ionosphere (Ebihara and Tanaka 2016) | |
Onset | Initial brightening | Enhanced flow shear at off-equator (Ebihara and Tanaka 2015b) |
Expansion | Westward traveling surge | Coupling of partial blockage of Hall current and MHD magnetosphere (Ebihara and Tanaka 2015a; Ebihara and Tanaka 2018) |