Research output: Contribution to journal › Article › peer-review
Continent-Wide R1/R2 Current System and Ohmic Losses by Broad Dipolarization-Injection Fronts. / Panov, E. V.; Baumjohann, W.; Nakamura, R.; Weygand, J. M.; Giles, B. L.; Russell, C. T.; Reeves, G.; Kubyshkina, M. V.
In: Journal of Geophysical Research: Space Physics, Vol. 124, No. 6, 06.2019, p. 4064-4082.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Continent-Wide R1/R2 Current System and Ohmic Losses by Broad Dipolarization-Injection Fronts
AU - Panov, E. V.
AU - Baumjohann, W.
AU - Nakamura, R.
AU - Weygand, J. M.
AU - Giles, B. L.
AU - Russell, C. T.
AU - Reeves, G.
AU - Kubyshkina, M. V.
N1 - Publisher Copyright: ©2019. American Geophysical Union. All Rights Reserved.
PY - 2019/6
Y1 - 2019/6
N2 - We employ Magnetospheric Multiscale, Geostationary Operational Environmental and Los Alamos National Laboratory satellites, as well as the ground magnetometer networks over Greenland and North America to study a substorm on 9 August 2016 between 9 and 10 UT. We found that during the substorm two earthward flows, whose dipolarization-injection fronts exceeded 6.5 and 4 Earth's radii (RE) in YGSM, impinged and rebounded from Earth's dipolar field lines at L=6–7 downtail, where L is the McIlwain number. The impingements and rebounds ended with a substorm current system of downward R1 and upward R2 currents which grew to azimuthally cover the whole North American continent. At the fronts, regions of enhanced negative j·E′ were formed and peaked toward the end of the impingements. These regions appeared to be conjugate with eastward moving aurora (along the growth phase arc and together with eastward drifting energetic electrons at geosynchronous equatorial orbit), which manifests ionospheric Ohmic losses.
AB - We employ Magnetospheric Multiscale, Geostationary Operational Environmental and Los Alamos National Laboratory satellites, as well as the ground magnetometer networks over Greenland and North America to study a substorm on 9 August 2016 between 9 and 10 UT. We found that during the substorm two earthward flows, whose dipolarization-injection fronts exceeded 6.5 and 4 Earth's radii (RE) in YGSM, impinged and rebounded from Earth's dipolar field lines at L=6–7 downtail, where L is the McIlwain number. The impingements and rebounds ended with a substorm current system of downward R1 and upward R2 currents which grew to azimuthally cover the whole North American continent. At the fronts, regions of enhanced negative j·E′ were formed and peaked toward the end of the impingements. These regions appeared to be conjugate with eastward moving aurora (along the growth phase arc and together with eastward drifting energetic electrons at geosynchronous equatorial orbit), which manifests ionospheric Ohmic losses.
KW - dipolarization
KW - injection
KW - ionosphere
KW - Joule heating
KW - M-I coupling
KW - substorm
KW - EARTHS MAGNETOSPHERE
KW - SPACECRAFT OBSERVATION
KW - PARTICLE INJECTIONS
KW - CURRENT DISRUPTION
KW - ION FLOWS
KW - SUBSTORM CURRENT WEDGE
KW - EXPANSION
KW - OSCILLATORY FLOW BRAKING
KW - PLASMA SHEET
KW - MAGNETOTAIL
UR - http://www.scopus.com/inward/record.url?scp=85067416021&partnerID=8YFLogxK
UR - http://www.mendeley.com/research/continentwide-r1r2-current-system-ohmic-losses-broad-dipolarizationinjection-fronts
U2 - 10.1029/2019JA026521
DO - 10.1029/2019JA026521
M3 - Article
AN - SCOPUS:85067416021
VL - 124
SP - 4064
EP - 4082
JO - Journal of Geophysical Research: Biogeosciences
JF - Journal of Geophysical Research: Biogeosciences
SN - 0148-0227
IS - 6
ER -
ID: 43183276