Relative contributions of large-scale and wedgelet currents in the substorm current wedge
| dc.contributor.author | Nishimura, Y. | |
| dc.contributor.author | Lyons, L. R | |
| dc.contributor.author | Gabrielse, C. | |
| dc.contributor.author | Weygand, J. M | |
| dc.contributor.author | Donovan, E. F | |
| dc.contributor.author | Angelopoulos, V. | |
| dc.date.accessioned | 2020-07-26T00:04:16Z | |
| dc.date.available | 2020-07-26T00:04:16Z | |
| dc.date.issued | 2020-07-20 | |
| dc.date.updated | 2020-07-26T00:04:15Z | |
| dc.description.abstract | 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. | |
| dc.identifier.citation | Earth, Planets and Space. 2020 Jul 20;72(1):106 | |
| dc.identifier.doi | https://doi.org/10.1186/s40623-020-01234-x | |
| dc.identifier.uri | http://hdl.handle.net/1880/112336 | |
| dc.identifier.uri | https://doi.org/10.11575/PRISM/44169 | |
| dc.language.rfc3066 | en | |
| dc.rights.holder | The Author(s) | |
| dc.title | Relative contributions of large-scale and wedgelet currents in the substorm current wedge | |
| dc.type | Journal Article |