A study of the precipitation of energetic electrons from the geomagnetic field during magnetic storms

1962 ◽  
Vol 67 (10) ◽  
pp. 3717-3736 ◽  
Author(s):  
J. R. Winckler ◽  
P. D. Bhavsar ◽  
K. A. Anderson
Keyword(s):  
Geomagnetic Field ◽  
Magnetic Storms ◽  
Energetic Electrons

Models of the geomagnetic field and characteristics of magnetic storms

2006 ◽  
Vol 12 (1) ◽  
pp. 64-69
Author(s):  
O.I. Maksimenko ◽  
◽  
L.N. Yaremenko ◽  
O.Ya. Shenderovskaya ◽  
G.V. Melnyk ◽  
...  
Keyword(s):  
Geomagnetic Field ◽  
Magnetic Storms

scholarly journals On the radiation belt location during the 23rd and 24th solar cycles

2019 ◽  
Vol 37 (4) ◽  
pp. 719-732
Author(s):  
Alexei V. Dmitriev
Keyword(s):  
North American ◽  
Geomagnetic Field ◽  
Radiation Belt ◽  
Occurrence Rate ◽  
Solar Cycles ◽  
Geomagnetic Jerk ◽  
Outer Radiation Belt ◽  
Energetic Electrons ◽  
Eastern Hemisphere

Abstract. Within the last two solar cycles (from 2001 to 2018), the location of the outer radiation belt (ORB) was determined using NOAA/Polar-orbiting Operational Environmental Satellite (POES) observations of energetic electrons with energies above 30 keV. It was found that the ORB was shifted a little (∼1∘) in the European and North American sectors, while in the Siberian sector the ORB was displaced equatorward by more than 3∘. The displacements corresponded qualitatively to the change in the geomagnetic field predicted by the IGRF-12 model. However, in the Siberian sector, the model has a tendency to underestimate the equatorward shift of the ORB. The shift became prominent after 2012, which might have been related to a geomagnetic “jerk” that occurred in 2012–2013. The displacement of the ORB to lower latitudes in the Siberian sector can contribute to an increase in the occurrence rate of midlatitude auroras observed in the Eastern Hemisphere.

scholarly journals Observation of Intermittency-Induced Critical Dynamics in Geomagnetic Field Time Series Prior to the Intense Magnetic Storms of March, June, and December 2015

2018 ◽  
Vol 123 (6) ◽  
pp. 4594-4613 ◽  
Author(s):  
Georgios Balasis ◽  
Ioannis A. Daglis ◽  
Yiannis Contoyiannis ◽  
Stelios M. Potirakis ◽  
Constantinos Papadimitriou ◽  
...  
Keyword(s):  
Time Series ◽  
Geomagnetic Field ◽  
Magnetic Storms ◽  
Critical Dynamics

TEMPORAL VARIATIONS OF OUTER RADIATION ZONE ELECTRON INTENSITIES AT 1 000 km

1966 ◽  
Vol 44 (7) ◽  
pp. 1361-1379 ◽  
Author(s):  
I. B. McDiarmid ◽  
J. R. Burrows
Keyword(s):  
Magnetic Storm ◽  
Equatorial Plane ◽  
Temporal Variations ◽  
Particle Energy ◽  
Magnetic Storms ◽  
Particle Detectors ◽  
Time Constants ◽  
Energetic Electrons ◽  
Radiation Zone ◽  
Magnetic Disturbances

The intensities of electrons in the outer Van Allen radiation zone are examined as a function of time using particle detectors on the Alouette 1 satellite. The study covers the period December 1962 to May 1963, during which several moderately large magnetic storms occurred. It is shown that within a few hours after the onset of a magnetic storm the intensity of electrons above 40 keV increases consistently, while the intensity of electrons above 3.9 MeV may decrease and remain low for about a day, or it may remain at prestorm levels for about a day, after which an increase in intensity usually follows. During magnetically quiet periods, electron intensities decay with time constants τ which depend on the particle energy. Typical values of τ are as follows: electrons E > 40 keV at L ~ 6, τ = 4 ± 1 days; E > 250 keV at L ~ 4.7, τ = 6 ± 2 days; E > 3.9 MeV at L ~ 4.3, τ = 14 ± 2 days. Some of the measurements are compared with Explorer 14 measurements which were made at the same time, and significant differences are observed in the behavior of energetic electrons on the same L shells at 1 000 km and near the equatorial plane. For electrons above 40 keV an attempt is made first to relate intensity increases at times of magnetic disturbances to an influx of particles from the "tail" of the magnetosphere and secondly to relate the intensity decreases at magnetically quiet times to a loss of particles into the atmosphere.

Recurrence-Based Quantification of Multi-Scale Dynamical Complexity in the Earth’s Magnetosphere

2021 ◽  
Author(s):  
Reik Donner
Keyword(s):  
Network Analysis ◽  
Space Weather ◽  
Geomagnetic Field ◽  
Magnetic Storms ◽  
Temporal Organization ◽  
Geophysical Research ◽  
Multi Scale ◽  
Dynamical Complexity ◽  
The Earth ◽  
Relevant Effect

<p>The Earth’s magnetosphere is characterized by a considerable degree of dynamical complexity resulting from the interaction of different multiscale processes, which can be both directly driven/triggered by changes of the interplanetary medium condition, and due to internal processes of the magnetosphere. This complexity can be characterized by following both “classical” and “new” dynamical system tools. Recent work has demonstrated that recurrence plot based techniques may play a pivotal role in such an assessment.</p><p>In this presentation, I will summarize some recent results on applications of recurrence quantification analysis and recurrence network analysis to different geomagnetic indices (Dst, SYM-H, ASY-H, AE) reflecting the variability of the Earth’s electromagnetic environment at different time-scales and magnetic latitudes. In addition, the same techniques are applied to some essential properties of the solar wind which are likely to have a relevant effect on geomagnetic field fluctuations and might serve as triggers of instability leading to geospace magnetic storms and/or magnetospheric substorms. The obtained findings underline that dynamical fluctuations of the geomagnetic field during periods of magnetospheric quiescence and storminess indeed exhibit distinctively different levels of dynamical complexity. Moreover, they provide additional evidence for a time-scale separation in magnetospheric dynamics that is further characterized by employing some multi-scale version of recurrence analysis utilizing a continuous wavelet transform of the signals of interest. The corresponding results can be of potential relevance for the development of improved approaches for space weather modelling and forecasting.</p><p> </p><p>References:</p><p>R.V. Donner, V. Stolbova, G. Balasis, J.F. Donges, M. Georgiou, S. Potirakis, J. Kurths: Temporal organization of magnetospheric fluctuations unveiled by recurrence patterns in the Dst index. Chaos, 28, 085716 (2018)</p><p>R.V. Donner, G. Balasis, V. Stolbova, M. Georgiou, M. Wiedermann, J. Kurths: Recurrence based quantification of dynamical complexity in the Earth's magnetosphere at geospace storm timescales. Journal of Geophysical Research - Space Physics, 124, 90-108 (2019)</p><p>J. Lekscha, R.V. Donner: Areawise significance tests for windowed recurrence network analysis. Proceedings of the Royal Society A, 475 (2228), 20190161 (2019)</p><p>T. Alberti, J. Lekscha, G. Consolini, P. De Michelis, R.V. Donner: Disentangling nonlinear geomagnetic variability during magnetic storms and quiescence by timescale dependent recurrence properties. Journal of Space Weather and Space Climate, 10, 25 (2020)</p>

scholarly journals Analysis of geomagnetic disturbances dynamics during increased solar activity and magnetic storms (according to the measurements of INTERMAGNET station network)

2019 ◽  
Vol 127 ◽  
pp. 02003
Author(s):  
Oksana Mandrikova ◽  
Anastasia Rodomanskay ◽  
Alexander Zaitsev
Keyword(s):  
Geomagnetic Activity ◽  
Geomagnetic Field ◽  
Auroral Zone ◽  
Magnetic Storms ◽  
Magnetic Data ◽  
Field Variation ◽  
Geomagnetic Disturbances ◽  
Station Network ◽  
Ground Station ◽  
Automated Method

We present and describe an automated method for analysis of magnetic data and for detection of geomagnetic disturbances based on wavelet transformation. The parameters of the computational algorithms allow us to estimate the characteristics of non-uniformly scaled peculiar properties in the variations of geomagnetic field that arise during increasing geomagnetic activity. The analysis of geomagnetic data before and during magnetic storms was carried out on the basis of the method according to ground station network. Periods of increasing geomagnetic activity, which precede and accompany magnetic storms, are highlighted. The dynamic of geomagnetic field variation in the auroral zone is considered in detail.

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