scholarly journals Reduction in field-aligned currents preceding and local to auroral substorm onset

2012 ◽  
Vol 39 (15) ◽  
Author(s):  
Kyle R. Murphy ◽  
Ian R. Mann ◽  
I. Jonathan Rae ◽  
Colin L. Waters ◽  
Brian J. Anderson ◽  
...  
Keyword(s):  
Substorm Onset ◽  
Auroral Substorm

scholarly journals Distinction between auroral substorm onset and traditional ground magnetic onset signatures

2013 ◽  
Vol 118 (7) ◽  
pp. 4080-4092 ◽  
Author(s):  
L. R. Lyons ◽  
Y. Nishimura ◽  
E. Donovan ◽  
V. Angelopoulos
Keyword(s):  
Substorm Onset ◽  
Auroral Substorm ◽  
Ground Magnetic

scholarly journals Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images

2018 ◽  
Vol 70 (1) ◽  
Author(s):  
Akimasa Ieda ◽  
Kirsti Kauristie ◽  
Yukitoshi Nishimura ◽  
Yukinaga Miyashita ◽  
Harald U. Frey ◽  
...  
Keyword(s):  
Substorm Onset ◽  
Simultaneous Observation ◽  
Auroral Substorm ◽  
Polar Satellite

scholarly journals Correction to: Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images

2019 ◽  
Vol 71 (1) ◽  
Author(s):  
Akimasa Ieda ◽  
Kirsti Kauristie ◽  
Yukitoshi Nishimura ◽  
Yukinaga Miyashita ◽  
Harald U. Frey ◽  
...  
Keyword(s):  
Substorm Onset ◽  
Simultaneous Observation ◽  
Auroral Substorm ◽  
Polar Satellite

Observation of IMF and seasonal effects in the location of auroral substorm onset

2001 ◽  
Vol 106 (A4) ◽  
pp. 5799-5810 ◽  
Author(s):  
K. Liou ◽  
P. T. Newell ◽  
D. G. Sibeck ◽  
C.-I Meng ◽  
M. Brittnacher ◽  
...  
Keyword(s):  
Substorm Onset ◽  
Seasonal Effects ◽  
Auroral Substorm

Relation of auroral substorm onset to local AL index and dispersionless particle injections

2008 ◽  
Vol 70 (18) ◽  
pp. 2336-2345 ◽  
Author(s):  
James M. Weygand ◽  
R.L McPherron ◽  
K. Kauristie ◽  
H.U. Frey ◽  
T.-S. Hsu
Keyword(s):  
Substorm Onset ◽  
Auroral Substorm

scholarly journals Observations of magnetic field dipolarization during auroral substorm onset

2000 ◽  
Vol 105 (A7) ◽  
pp. 15897-15912 ◽  
Author(s):  
L. A. Frank ◽  
W. R. Paterson ◽  
J. B. Sigwarth ◽  
S. Kokubun
Keyword(s):  
Magnetic Field ◽  
Substorm Onset ◽  
Auroral Substorm

scholarly journals Variations of auroral hydrogen emission near substorm onset

2005 ◽  
Vol 23 (5) ◽  
pp. 1623-1635 ◽  
Author(s):  
L. P. Borovkov ◽  
B. V. Kozelov ◽  
L. S. Yevlashin ◽  
S. A. Chernouss
Keyword(s):  
Energy Flux ◽  
Average Energy ◽  
Auroral Oval ◽  
Substorm Onset ◽  
Balmer Line ◽  
Hydrogen Emission ◽  
Auroral Substorm ◽  
Evening Sector ◽  
Angle Scattering ◽  
Different Populations

Abstract. The results of coordinated optical ground-based observations of the auroral substorm on 26 March 2004 in the Kola Peninsula are described. Imaging spectrograph data with high spectral and temporal resolution recorded the Doppler profile of the Hα hydrogen emission; this allows us to estimate the average energy of precipitating protons and the emission intensity of the hydrogen Balmer line. Two different populations of precipitating protons were observed during an auroral substorm. The first of these is associated with a diffuse hydrogen emission that is usually observed in the evening sector of the auroral oval and located equatorward of the discrete electron arcs associated with substorm onset. The average energy of the protons during this precipitation was ~20–35 keV, and the energy flux was ~3x10–4Joule/m2s. The second proton population was observed 1–2min after the breakup during 4–5min of the expansion phase of substorm into the zone of bright, discrete auroral structures (N-S arcs). The average energy of the protons in this population was ~60 keV, and the energy flux was ~2.2x10–3Joule/m2s. The observed spatial structure of hydrogen emission is additional evidence of the higher energy of precipitated protons in the second population, relative to the protons in the diffuse aurora. We believe that the most probable mechanism of precipitation of the second population protons was pitch-angle scattering of particles due to non-adiabatic motion in the region of local dipolarization near the equatorial plane.Keywords. Auroral ionosphere; Particle precipitation; Storms and substorms

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