Modeling Stable Auroral Red (SAR) Arcs at Geomagnetic Conjugate Points: Implications for Hemispheric Asymmetries in Heat Fluxes
Modeling Stable Auroral Red (SAR) Arcs at Geomagnetic Conjugate Points: Implications for Hemispheric Asymmetries in Heat Fluxes
复制标题
对地磁共轭点处的稳定极光红 (SAR) 弧进行建模:对热通量中半球不对称性的影响
DOI:
10.1029/2019ja026904
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Wroten, Joei
中科院分区:
文献类型:
--
作者:
Mendillo, Michael;Wroten, Joei
Stable auroral red (SAR) arcs provide opportunities to study inner magnetosphere‐ionosphere coupling at midlatitudes. An imaging system at a single‐site obtains evidence of seasonal variations in SAR arc brightness and occurrence rates using events widely separated in time, as observed during different geomagnetic storms. The first SAR arc observed using two all‐sky imagers at geomagnetic conjugate points described seasonal effects at the same time for the same storm (Martinis, Mendillo, et al., 2019, https://doi.org/10.1029/2018JA026018). Here we report on modeling studies that enable specification of the roles of local “receptor conditions” in each hemisphere, plus the division of driving energy from a single source region into conjugate ionospheres. The geomagnetic storm of 1 June 2013 produced SAR arcs observed by conjugate all‐sky imagers yielding 73 Rayleighs (R) at Millstone Hill (L= 2.64) in the summer hemisphere, and 300 R during local winter at Rothera (L= 2.92). With incoherent scatter radar data not available to specify input conditions, we offer a new simulation approach using non‐incoherent scatter radar observations to specify local receptor conditions. These include a combination of semiempirical models (International Reference Ionosphere and MSIS) calibrated by local ionosonde and DMSP satellite data. We find that the driving mechanism (heat conduction entering the ionosphere) is not an equal partition of energy from the ring current source region, but one that is weaker in the summer hemisphere where the local receptor conditions are poised to produce fainter SAR arcs. The relationship between SAR arcs and recently discovered STEVE events are discussed and require further study.
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影响因子:
1.9
作者:
J. Baumgardner;J. Wroten;J. Semeter;J. Kozyra;M. Buonsanto;P. Erickson;M. Mendillo
通讯作者:
M. Mendillo
DOI:
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发表时间:
1975
期刊:
影响因子:
--
作者:
M. Rees;R. Roble
通讯作者:
R. Roble
DOI:
10.1002/2015ja021722
发表时间:
2016
期刊:
Journal of Geophysical Research: Space Physics
影响因子:
--
作者:
M. Mendillo;J. Baumgardner;J. Wroten
通讯作者:
J. Wroten
DOI:
--
发表时间:
1991
期刊:
影响因子:
--
作者:
M. Fok;J. Kozyra;L. H. Brace
通讯作者:
L. H. Brace
DOI:
10.1029/2018ja026018
发表时间:
2019
期刊:
Journal of Geophysical Research: Space Physics
影响因子:
--
作者:
Martinis, Carlos;Baumgardner, Jeffrey;Mendillo, Michael;Wroten, Joei;MacDonald, Timothy;Kosch, Michael;Lazzarin, Monica;Umbriaco, Gabriele
通讯作者:
Umbriaco, Gabriele