The role of the ring current in the generation or inhibition of equatorialFlayer irregularities during magnetic storms

Radio Science ◽  
1991 ◽  
Vol 26 (4) ◽  
pp. 1131-1149 ◽  
Author(s):  
J. Aarons
Keyword(s):  
Ring Current ◽  
Magnetic Storms

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.

Survey of Ring Current Composition During Magnetic Storms

1998 ◽  
Author(s):  
M. Grande ◽  
C. H. Perry ◽  
A. Hall ◽  
J. Fennell ◽  
B. Wilken
Keyword(s):  
Ring Current ◽  
Magnetic Storms

Analysis of Magnetic Storms withDRIndices for Equatorial Ring-Current Field

Radio Science ◽  
1971 ◽  
Vol 6 (2) ◽  
pp. 277-278 ◽  
Author(s):  
Yohsuke Kamide ◽  
Naoshi Fukushima
Keyword(s):  
Ring Current ◽  
Magnetic Storms ◽  
Current Field

scholarly journals Dominant role of the asymmetric ring current in producing the stormtimeDst*

2001 ◽  
Vol 106 (A6) ◽  
pp. 10883-10904 ◽  
Author(s):  
M. W. Liemohn ◽  
J. U. Kozyra ◽  
M. F. Thomsen ◽  
J. L. Roeder ◽  
G. Lu ◽  
...  
Keyword(s):  
Ring Current ◽  
Dominant Role

scholarly journals Assessing the role of oxygen on ring current formation and evolution through numerical experiments

2015 ◽  
Vol 120 (6) ◽  
pp. 4656-4668 ◽  
Author(s):  
R. Ilie ◽  
M. W. Liemohn ◽  
G. Toth ◽  
N. Yu Ganushkina ◽  
L. K. S. Daldorff
Keyword(s):  
Numerical Experiments ◽  
Ring Current ◽  
Formation And Evolution
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