Ring current decay rates of magnetic storms: A statistical study from 1957 to 1998

2002 ◽  
Vol 107 (A5) ◽  
Author(s):  
Sergio Dasso
Keyword(s):  
Ring Current ◽  
Statistical Study ◽  
Magnetic Storms ◽  
Decay Rates ◽  
Current Decay

scholarly journals Statistical Study of Selective Oxygen Increase in High‐Energy Ring Current Ions During Magnetic Storms

2019 ◽  
Vol 124 (5) ◽  
pp. 3193-3209 ◽  
Author(s):  
K. Mitani ◽  
K. Seki ◽  
K. Keika ◽  
M. Gkioulidou ◽  
L. J. Lanzerotti ◽  
...  
Keyword(s):  
Ring Current ◽  
Statistical Study ◽  
High Energy ◽  
Magnetic Storms

scholarly journals Ionospheric storm effects in the nighttime E region caused by neutralized ring current particles

1997 ◽  
Vol 15 (3) ◽  
pp. 300-305 ◽  
Author(s):  
R. Bauske ◽  
S. Noël ◽  
G. W. Prölss
Keyword(s):  
Ring Current ◽  
Magnetic Storms ◽  
Ionospheric Storm ◽  
Anomalous Increase ◽  
Storm Effects ◽  
Current Decay ◽  
Middle Latitudes ◽  
Ionization Density ◽  
Ionosphere Model ◽  
E Region

Abstract. During magnetic storms an anomalous increase in the ionization density of the nighttime E region is observed at low and middle latitudes. It has been suggested that this effect is caused by the precipitation of neutralized ring current particles. Here a coupled ring current decay-ionosphere model is used to confirm the validity of this explanation.

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

scholarly journals Another way of deriving the ring current decay time during disturbed periods

1995 ◽  
Vol 38 (2) ◽  
Author(s):  
M. M. Zossi de Artigas ◽  
J. R. Manzano
Keyword(s):  
Ring Current ◽  
Coupling Parameter ◽  
Life Time ◽  
Recovery Phase ◽  
Main Phase ◽  
Physical Analysis ◽  
Inner Magnetosphere ◽  
Current Decay ◽  
The Many ◽  
Energy Dissipated

Coupling parameter, E, and the total energy dissipated by the magnetosphere, UT, are determined for six disturbed periods, following three known criteria for UT computation. It is observed that UT exceeds E for Dst < -90 nT, for alI models. Differences between models reside on the estimated valnes for the particles' life time il1 the equatorial ring current. The values of TR, used in the models, are small during the main phase of the di."turbance, in disagreement with the charge exchange life time of the majority species, H+ and O'-. Based on this conclusion, a different criterion to calculate TR is proposed, differentiating the different stages of the perturbation. TR is calculated, for the main phase of the storm, from the rate of energy deposition estimation, Q, in the ring current. For Dst recovery phase, the vallles are obtained from a ring current decay law computation. The UTvu calculated, physically more coherent with the processes occurring during the event, is now smaller than expected. In this sense, it is understood that the power generated by the solar wind-magnetosphere dy- namo, should also be distributed in the inner magnetosphere, auroral zones and equatorial ring current, as in the outer magnetosphere, plasmoids in the tail shot in antisolar direction. A further adjustment of E, with the Chapman-Ferraro distance, 10' variable, has been made. Although the reslllts, improve the estimation of E, they are sti!l smaller than UT, except UTNU, for some disturbed periods. This result indicates the uncertainty in the computation of the input energy, by using the many expressions proposed in the literature, which are always presented as laws proportional to a given group of parameters, with an unknown factor of proportionality, which deserves more detailed physical analysis.

Ring current decay

2020 ◽  
pp. 181-223
Author(s):  
Vania K. Jordanova
Keyword(s):  
Ring Current ◽  
Current Decay

Unusually high thermospheric hydrogen density prior to severe storm of September 8, 2017 and its impact on the storm manifestations

2020 ◽  
Author(s):  
Dmytro Kotov ◽  
Philip Richards ◽  
Oleksandr Bogomaz ◽  
Maryna Shulha ◽  
Naomi Maruyama ◽  
...  
Keyword(s):  
Atomic Hydrogen ◽  
Primary Source ◽  
Recovery Phase ◽  
Magnetic Storms ◽  
Geophysical Research ◽  
High Hydrogen ◽  
Severe Storm ◽  
Hydrogen Density ◽  
Quick Recovery ◽  
Current Decay

&lt;p&gt;Atomic hydrogen plays a key role for the plasmasphere, exosphere, and the nighttime ionosphere. It directly impacts the rate of plasmasphere refilling after strong magnetic storms as atomic hydrogen is the primary source of hydrogen ions. It is the source of the geocorona, which significantly affects ring current decay during the recovery phase of magnetic storms.&lt;/p&gt;&lt;p&gt;Our previous studies with the Kharkiv incoherent scatter radar (49.6 N, 36.3&amp;#160;E), Arase and DMSP satellite missions, and FLIP physical model showed that during magnetically quiet periods of 2016&amp;#8211;2018 the hydrogen density was generally a factor of 2 higher than from the NRLMSIS00-E model (Kotov et al., 2018).&lt;/p&gt;&lt;p&gt;Even larger values of thermospheric hydrogen density were detected prior to the severe storm of September 8, 2017. With Kharkiv IS radar, AWDANet whistler receivers, Arase satellite, and TEC data we found that during the nights of September 5 to 6 and September 6 to 7, the thermospheric hydrogen density had to be at least a factor of 4 higher than the values from NRLMSIS00-E model i.e. ~100% higher than expected from our previous studies. We discuss the possible mechanisms that could lead to the increased hydrogen density.&lt;/p&gt;&lt;p&gt;Such high hydrogen densities may be the reason for very quick recovery of inner plasmasphere after the severe depletion by the storm of September 8, 2017 (Obana et al., 2019).&lt;/p&gt;&lt;p&gt;&lt;strong&gt;References:&lt;/strong&gt;&lt;/p&gt;&lt;p&gt;1. Kotov, D. V., Richards, P. G., Truhl&amp;#237;k, V., Bogomaz, O. V., Shulha, M. O., Maruyama, N., et al. ( 2018). Coincident observations by the Kharkiv IS radar and ionosonde, DMSP and Arase (ERG) satellites, and FLIP model simulations: Implications for the NRLMSISE&amp;#8208;00 hydrogen density, plasmasphere, and ionosphere. Geophysical Research Letters, 45, 8062&amp;#8211; 8071. https://doi.org/10.1029/2018GL079206&lt;/p&gt;&lt;p&gt;2. Obana, Y., Maruyama, N., Shinbori, A., Hashimoto, K. K., Fedrizzi, M., Nos&amp;#233;, M., et al. (2019). Response of the ionosphere&amp;#8208;plasmasphere coupling to the September 2017 storm: What erodes the plasmasphere so severely? Space Weather, 17, 861&amp;#8211;876. https://doi.org/10.1029/2019SW002168&lt;/p&gt;

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
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