Two-Step Acceleration of Auroral Particles at Substorm Onset as Derived From Auroral Kilometric Radiation Spectra

2012 ◽  
pp. 279-286 ◽  
Author(s):  
Akira Morioka ◽  
Yoshizumi Miyoshi
Keyword(s):  
Substorm Onset ◽  
Auroral Kilometric Radiation ◽  
Radiation Spectra ◽  
Auroral Particles

Auroral kilometric radiation at substorm onset

2000 ◽  
Vol 105 (A11) ◽  
pp. 25325-25331 ◽  
Author(s):  
K. Liou ◽  
C.-I. Meng ◽  
A. T. Y. Lui ◽  
P. T. Newell ◽  
R. R. Anderson
Keyword(s):  
Substorm Onset ◽  
Auroral Kilometric Radiation

Dual structure of auroral acceleration regions at substorm onsets as derived from auroral kilometric radiation spectra

2007 ◽  
Vol 112 (A6) ◽  
pp. n/a-n/a ◽  
Author(s):  
A. Morioka ◽  
Y. Miyoshi ◽  
F. Tsuchiya ◽  
H. Misawa ◽  
T. Sakanoi ◽  
...  
Keyword(s):  
Dual Structure ◽  
Auroral Kilometric Radiation ◽  
Radiation Spectra ◽  
Substorm Onsets

scholarly journals Vertical evolution of auroral acceleration at substorm onset

2009 ◽  
Vol 27 (2) ◽  
pp. 525-535 ◽  
Author(s):  
A. Morioka ◽  
Y. Miyoshi ◽  
F. Tsuchiya ◽  
H. Misawa ◽  
K. Yumoto ◽  
...  
Keyword(s):  
Substorm Onset ◽  
Acceleration Process ◽  
Acceleration Region ◽  
Auroral Kilometric Radiation ◽  
Auroral Breakup ◽  
Auroral Substorms ◽  
Vertical Evolution ◽  
Field Aligned Current ◽  
Low Altitude ◽  
Two Stages

Abstract. This study describes the onset process of auroral substorms in connection with the vertical evolution of auroral particle acceleration, on the basis of auroral kilometric radiation (AKR) dynamics. We show that the auroral acceleration process at substorm onset basically consists of two stages: (1) appearance/intensification of a low-altitude acceleration region at 4000–5000 km accompanied by initial brightening and (2) breakout of high-altitude field-aligned acceleration above the pre-existing low-altitude acceleration region at 6000–12 000 km, which is followed by auroral breakup and poleward expansion. It is also revealed that this two-stage evolution of auroral acceleration corresponds to the two-step reinforcement of field-aligned current.

The Influence Of The Led Luminaires Electrical Parameters On Their Correlated Colour Temperature During Operation Mode

2020 ◽  
pp. 89-96
Author(s):  
Sergei S. Kapitonov ◽  
Alexei S. Vinokurov ◽  
Sergei V. Prytkov ◽  
Sergei Yu. Grigorovich ◽  
Anastasia V. Kapitonova ◽  
...  
Keyword(s):  
Operation Mode ◽  
Light Sources ◽  
Electrical Parameters ◽  
Colour Temperature ◽  
Radiation Spectra ◽  
Service Period ◽  
Close Proximity ◽  
Definition Of ◽  
Comprehensive Study

The article describes the results of comprehensive study aiming at increase of quality of LED luminaires and definition of the nature of changes in their correlated colour temperature (CCT) in the course of operation. Dependences of CCT of LED luminaires with remote and close location of phosphor for 10 thousand hours of operation in different electric modes were obtained; the results of comparison between the initial and final radiation spectra of the luminaires are presented; using mathematical statistics methods, variation of luminaire CCT over the service period claimed by the manufacturer is forecast; the least favourable electric operation modes with the highest CCT variation observed are defined. The obtained results have confirmed availability of the problem of variation of CCT of LED luminaires during their operation. Possible way of its resolution is application of more qualitative and therefore expensive LEDs with close proximity of phosphor or LEDs with remote phosphor. The article may be interesting both for manufacturers and consumers of LED light sources and lighting devices using them.

Radiation spectra of electric discharge in adenine vapors

2015 ◽  
Vol 38 (0) ◽  
pp. 33-37
Author(s):  
Юрій Юрійович Свида ◽  
Марія Іллівна Суховія ◽  
Микола Олексійович Маргітич ◽  
Мирослав Іванович Шафраньош ◽  
Іван Іванович Шафраньош
Keyword(s):  
Electric Discharge ◽  
Radiation Spectra

Monitoring of the Electron-Acceleration Region with Auroral Kilometric Radiation

2020 ◽  
Vol 60 (5) ◽  
pp. 538-546
Author(s):  
D. V. Chugunin ◽  
A. A. Chernyshov ◽  
I. L. Moiseenko ◽  
M. E. Viktorov ◽  
M. M. Mogilevsky
Keyword(s):  
Electron Acceleration ◽  
Acceleration Region ◽  
Auroral Kilometric Radiation

scholarly journals Decay of the Dst field of geomagnetic disturbance after substorm onset and its implication to storm-substorm relation

1996 ◽  
Vol 14 (6) ◽  
pp. 608-618 ◽  
Author(s):  
T. Iyemori ◽  
D. R. K. Rao
Keyword(s):  
Ring Current ◽  
Geomagnetic Storms ◽  
Sharp Decrease ◽  
Geomagnetic Disturbance ◽  
Substorm Onset ◽  
Significant Development ◽  
H Index ◽  
Magnetospheric Tail ◽  
Storms And Substorms ◽  
Substorm Onsets

Abstract. In order to investigate the causal relationship between magnetic storms and substorms, variations of the mid-latitude geomagnetic indices, ASY (asymmetric part) and SYM (symmetric part), at substorm onsets are examined. Substorm onsets are defined by three different phenomena; (1) a rapid increase in the mid-latitude asymmetric-disturbance indices, ASY-D and ASY-H, with a shape of so-called `mid-latitude positive bay\\'; (2) a sharp decrease in the AL index; (3) an onset of Pi2 geomagnetic pulsation. The positive bays are selected using eye inspection and a pattern-matching technique. The 1-min-resolution SYM-H index, which is essentially the same as the hourly Dst index except in terms of the time resolution, does not show any statistically significant development after the onset of substorms; it tends to decay after the onset rather than to develop. It is suggested by a simple model calculation that the decay of the magnetospheric tail current after substorm onset is responsible for the decay of the Dst field. The relation between the IMF southward turning and the development of the Dst field is re-examined. The results support the idea that the geomagnetic storms and substorms are independent processes; that is, the ring-current development is not the result of the frequent occurrence of substorms, but that of enhanced convection caused by the large southward IMF. A substorm is the process of energy dissipation in the magnetosphere, and its contribution to the storm-time ring-current formation seems to be negligible. The decay of the Dst field after a substorm onset is explained by a magnetospheric energy theorem.

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