Comment on “Formation of substorm Pi2: A coherent response to auroral streamers and currents” by Y. Nishimura et al.

Rae, I. J.; Murphy, K. R.; Miles, David M.; Watt, Clare E. J.; Mann, I. R.

doi:10.1002/jgra.50336

Cited by 5 publications

(16 citation statements)

References 30 publications

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“…The FSIM imager keogram (Figure 2b of N12) mainly detected the surge whose intensity slowly increased and decreased in time without quasiperiodic auroral intensifications. The intensity evolution in this keogram is similar to that of Figure f of R13, which contains the moonlight‐contaminated meridians of FSMI. Thus, this surge brightness dominated their keogram and masked the quasiperiodic streamer intensifications.…”

Section: Introductionsupporting

confidence: 63%

“…The keogram from the FSMI imager data covers the streamer meridians and identified quasiperiodic auroral intensifications as indicated by the red arrows (Figure 2c). R13 successfully reproduced the quasiperiodic activity in their Figure a and gave us confidence that the quasiperiodic auroral intensifications do exist in this event. Their Figure 2 (left) demonstrates that the quasiperiodic intensifications can be seen as brightness increases starting from the vertical lines.…”

Section: Introductionmentioning

confidence: 59%

“…Rae et al . [, hereinafter R13] reanalyzed one of N12 events and made the following claims: Their keograms that include all usable data points do not show quasiperiodic auroral intensifications in the Pi2 frequency range. Thus, the conclusions of N12 could be affected by the data selection. Their keograms and magnetograms do not show a clear phase relationship between maximum auroral brightness and ground magnetic field changes.…”

Section: Introductionmentioning

confidence: 99%

“…The first two of the above claims result from R13 not considering one of the most important, and fundamental properties of streamers, that being they are localized in both latitude and longitude. Expansion‐phase auroral streamers often form in a somewhat localized region that is typically the eastern edge of an auroral surge [ Nakamura et al ., ].…”

Section: Introductionmentioning

confidence: 99%

“…N12 removed the meridians that are contaminated by moonlight, which is the eastern portion of each imager field of view (FOV). R13 created their Figure f by including imager data poleward of the moonlight contamination FSMI imager FOV. This region contains the surge that is also covered by eastern portion of the FSIM imager FOV.…”

Section: Introductionmentioning

confidence: 99%

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et al. 2013

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Section: Introductionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Reply to comment by Rae et al. on “Formation of substorm Pi2: A coherent response to auroral streamers and currents”

et al. 2013

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Field line resonances as a trigger and a tracer for substorm onset

et al. 2014

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In this paper, we show that periodic auroral arc structures are seen at the location of one particular auroral substorm onset for the 15 min preceding onset, suggesting that field line resonances should be considered a strong candidate for triggering substorm onset. Irrespective of whether this field line resonance is coincidentally or causally linked to this substorm onset, the characteristics of the field line resonance can be used to remote sense the characteristics of the geomagnetic field line that supports substorm onset. In this instance, the eigenfrequency of this resonance is around 12 mHz. Interestingly, however, there is no evidence of this field line resonance in a seven satellite major Time History of Events and Macroscale Interactions during Substorms (THEMIS)-GOES conjunction, ranging from geosynchronous orbit to~30 R E . However, using space-based cross-phase measurements of the local field line eigenfrequency at the inner THEMIS locations, we find that the local field line eigenfrequency is 6-10 mHz. Hence, we can reliably say that this 12 mHz Field Line Resonance (FLR) must lie inside of THEMIS locations. Our conclusion is that a high-m field line resonance can both represent a strong candidate for a trigger for substorm onset, as first proposed by Samson et al. (1992), and that its characteristics can provide invaluable information as to where substorm onset occurs in the magnetosphere.

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Large‐Scale Structure and Dynamics of the Magnetosphere

Sibeck

Murphy

2021

Geophysical Monograph Series

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Comment on “Formation of substorm Pi2: A coherent response to auroral streamers and currents” by Y. Nishimura et al.

Cited by 5 publications

References 30 publications

Reply to comment by Rae et al. on “Formation of substorm Pi2: A coherent response to auroral streamers and currents”

Reply to comment by Rae et al. on “Formation of substorm Pi2: A coherent response to auroral streamers and currents”

Field line resonances as a trigger and a tracer for substorm onset

Large‐Scale Structure and Dynamics of the Magnetosphere

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