Relative contributions of large-scale and wedgelet currents in the substorm current wedge
Abstract
We examined how much large-scale and localized upward and downward currents contribute to the substorm current wedge (SCW), and how they evolve over time, using the THEMIS all-sky imagers (ASIs) and ground magnetometers. One type of events is dominated by a single large-scale wedge, with upward currents over the surge and broad downward currents poleward-eastward of the surge. The other type of events is a composite of large-scale wedge and wedgelets associated with streamers, with each wedgelet having comparable intensity to the large-scale wedge currents. Among 17 auroral substorms with wide ASI coverage, the composite current type is more frequent than the single large-scale wedge type. The dawn–dusk size of each wedgelet is ~ 600 km in the ionosphere (~ 3.2 RE in the magnetotail, comparable to the flow channel size). We suggest that substorms have more than one type of SCW, and the composite current type is more frequent.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 20, 2020
- Source ID
- 10.1186/s40623-020-01234-x
Entities
People
- Christine Gabrielse
- E. F. Donovan
- J. M. Weygand
- L. R. Lyons
- V. Angelopoulos
- Yukitoshi Nishimura
Organizations
- National Aeronautics and Space Administration
- National Science Foundation
- United States Air Force