Role of plasma instabilities driven by oxygen ions during magnetic storms and substorms

2003 ◽  
pp. 131-141 ◽  
Author(s):  
G.S. Lakhina ◽  
S.V. Singh
Keyword(s):  
Magnetic Storms ◽  
Plasma Instabilities ◽  
Oxygen Ions ◽  
Storms And Substorms

scholarly journals Role of Plasma Instabilities in Auroral Phenomena

Nature ◽  
1965 ◽  
Vol 205 (4975) ◽  
pp. 998-998 ◽  
Author(s):  
BRUNO COPPI
Keyword(s):  
Plasma Instabilities ◽  
Auroral Phenomena

Effect of magnetic storms and substorms on GPS slips at high latitudes

2016 ◽  
Vol 54 (1) ◽  
pp. 20-30 ◽  
Author(s):  
V. I. Zakharov ◽  
Yu. V. Yasyukevich ◽  
M. A. Titova
Keyword(s):  
Magnetic Storms ◽  
High Latitudes ◽  
Storms And Substorms

Role of microscopic plasma instabilities on shock dissipation process

2009 ◽  
Author(s):  
N. Shimada ◽  
M. Hoshino ◽  
Masfumi Hirahara ◽  
Yoshizumi Miyoshi ◽  
Naoki Terada ◽  
...  
Keyword(s):  
Plasma Instabilities ◽  
Dissipation Process ◽  
Shock Dissipation

scholarly journals Geosynchronous magnetopause crossings and their relationships with magnetic storms and substorms

Space Weather ◽  
2021 ◽  
Author(s):  
A. A. Samsonov ◽  
Y. V. Bogdanova ◽  
G. Branduardi‐Raymont ◽  
L. Xu ◽  
J. Zhang ◽  
...  
Keyword(s):  
Magnetic Storms ◽  
Storms And Substorms

Role of Oxygen Potential and Oxygen Ions on Phosphorus Removal from Silicon via Addition of FeO into Slag

Silicon ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 1145-1156
Author(s):  
Nan Zhang ◽  
Guoyu Qian ◽  
Zhi Wang ◽  
Kuixian Wei ◽  
Wenhui Ma ◽  
...  
Keyword(s):  
Phosphorus Removal ◽  
Oxygen Potential ◽  
Oxygen Ions

scholarly journals High-latitude propagation studies using a meridional chain of LF/MF/HF receivers

2004 ◽  
Vol 22 (5) ◽  
pp. 1705-1718 ◽  
Author(s):  
J. LaBelle
Keyword(s):  
High Latitude ◽  
Auroral Zone ◽  
Magnetic Storms ◽  
Dartmouth College ◽  
Propagation Characteristics ◽  
Radio Science ◽  
Ionospheric Physics ◽  
Ionospheric Propagation ◽  
Latitude Range ◽  
Storms And Substorms

Abstract. For over a decade, Dartmouth College has operated programmable radio receivers at multiple high-latitude sites covering the frequency range 100-5000kHz with about a 1-s resolution. Besides detecting radio emissions of auroral origin, these receivers record characteristics of the ionospheric propagation of natural and man-made signals, documenting well-known effects, such as the diurnal variation in the propagation characteristics of short and long waves, and also revealing more subtle effects. For example, at auroral zone sites in equinoctial conditions, the amplitudes of distant transmissions on MF/HF frequencies are often enhanced by a few dB just before they fade away at dawn. The polarization and/or direction of the arrival of ionospherically propagating signals in the lower HF range (3-5MHz) show a consistent variation between pre-midnight, post-midnight, and pre-dawn conditions. As is well known, magnetic storms and substorms dramatically affect ionospheric propagation; data from multiple stations spanning the invariant latitude range 67-79° reveal spatial patterns of propagation characteristics associated with magnetic storms and substorms. For example, in the hours preceding many isolated substorms, favorable propagation conditions occur at progressively lower latitudes as a function of time preceding the substorm onset. For some of these effects, explanations follow readily from elementary ionospheric physics, but understanding others requires further investigation.Key words. Magnetospheric physics (annual phenomena) – Radio science (ionosphere propagation; radio-wave propagation)6

scholarly journals Possible role of auroral oval-related currents in two intense magnetic storms recorded by old mid-latitude observatories Clementinum and Greenwich

2019 ◽  
Vol 9 ◽  
pp. A11 ◽  
Author(s):  
Fridrich Valach ◽  
Pavel Hejda ◽  
Miloš Revallo ◽  
Josef Bochníček
Keyword(s):  
Ring Current ◽  
Historical Data ◽  
Auroral Oval ◽  
Magnetic Storms ◽  
Local Times ◽  
The North ◽  
Positive Variation ◽  
Modern Knowledge ◽  
Different Parts

Some recent studies point out that currents related to the auroral oval, electrojets and field aligned currents (FACs), are serious candidates for the mechanism of the intense mid-latitude magnetic storms. It is interesting to re-analyse historical data under the light of this modern knowledge. In this aim, we analysed two intense magnetic storms that were recorded by observatories Clementinum (Prague) and Greenwich on 17 November 1848 and 4 February 1872, respectively. The latter has been marked as an extraordinary event by several authors, in particular in connection with auroras. The former, however, has been little known in the space weather community. Both these events possessed swift and extensive variations of the horizontal (H) component (>400 nT and >500 nT, respectively) and were accompanied by auroras sighted at very low magnetic latitudes. This implies that the auroral oval on the north hemisphere was vastly extended southward. The variations of the magnetic declination also indicate that during these events the auroral oval was situated at magnetic latitudes lower than those of the observatories. The storms studied in this paper occurred at different magnetic local times (MLTs), ~23 MLT and ~19 MLT. Therefore, they might represent mid-latitude events related to different parts of the auroral oval. In this paper, the H-variation recorded at Clementinum in 1848 is interpreted to be a substorm due to the ionospheric substorm electrojet. The Greenwich event registered in 1872 then seems to be a combination of the ring-current storm with a positive variation of the H-component caused by the eastward electrojet. Both the events of 1848 and 1872 appear to exemplify phenomena that are common in high magnetic latitudes but which may occasionally happen also at mid-latitudes.

Measurement of Partial Conductivities in Mixed Conductors Using Blocking Electrodes

1994 ◽  
Vol 369 ◽  
Author(s):  
Al Quoc Pham ◽  
Allan J. Jacobson
Keyword(s):  
Mixed Conductor ◽  
Ac Impedance Spectroscopy ◽  
Bulk Resistance ◽  
Oxygen Ions ◽  
Electronic Current ◽  
Mixed Ionic Electronic Conductor ◽  
Electrode Method ◽  
Gold Metal

AbstractThe blocking electrode method commonly used for the determination of the partial conductivities in a mixed ionic-electronic conductor has been suspected by several authors to give incorrect results in some cases. Experimental evidence illustrating the limitations of this method are presented. The resistance of three pellets of YSZ, the middle one playing the role of a “mixed” conductor, was studied by ac impedance spectroscopy. The imperfect contacts on a microscopic scale formed at the interface between the blocking electrodes and the sample were shown to give rise to additional resistances which cannot be separated from the total bulk resistance. The method was also used to study the conductivity of gold metal. Despite the presence of the ionically blocking electrodes an electronic current is observed. This electronic leakage current is due to the interaction with the gaseous environment, the mixed conductor playing the role of an electrode for the conversion of oxygen ions to electrons.

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