RELATIONSHIP BETWEEN GEOMAGNETIC STORM DEVELOPMENT AND THE SOLAR WIND PARAMETER ß
Journal Title: Solar-Terrestrial Physics - Year 2021, Vol 7, Issue 4
Abstract
We have analyzed the dynamics of solar wind and interplanetary magnetic field (IMF) parameters during the development of 933 isolated geomagnetic storms, observed over the period from 1964 to 2010. The analysis was carried out using the epoch superposition method at intervals of 48 hrs before and 168 hrs after the moment of Dst minimum. The geomagnetic storms were selected by the type of storm commencement (sudden or gradual) and by intensity (weak, moderate, and strong). The dynamics of the solar wind and IMF parameters was compared with that of the Dst index, which is an indicator of the development of geomagnetic storms. The largest number of storms in the solar activity cycle is shown to occur in the years of minimum average values (close in magnitude to 1) of the solar wind parameter β (β is the ratio of plasma pressure to magnetic pressure). We have revealed that the dynamics of the Dst index is similar to that of the β parameter. The duration of the storm recovery phase follows the characteristic recovery time of the β parameter. We have found out that during the storm main phase the β parameter is close to 1, which reflects the maximum turbulence of solar wind plasma fluctuations. In the recovery phase, β returns to background values β~2‒3.5. We assume that the solar wind plasma turbulence, characterized by the β parameter, can play a significant role in the development of geomagnetic storms.
Authors and Affiliations
Kurazhkovskaya N. A. , Zotov O. D. , Klain B. I.
Keywords
Related Articles
- EP ID EP700038
- DOI 10.12737/stp-74202104
- Views 89
- Downloads 0
RECURRENT AND SPORADIC FORBUSH DECREASES DURING SOLAR CYCLES 23–24
A comparison has been made between recurrent (associated with high-speed streams from coronal holes) and sporadic (caused by interplanetary coronal mass ejections (ICMEs)) Forbush decreases (FDs) in solar cycles 23 and 2...
INVERSION OF BACKSCATTER IONOGRAMS INTO QUASIPARABOLIC IONOSPHERIC LAYER PARAMETERS
We present an inversion scheme of the backscatter signal leading edge into parameters of the quasi-parabolic electron density profile, which is based on the comparison of experimental and calculated minimum delays of sca...
SECOND-ORDER PERTURBATIONS IN ALFVÉN WAVES IN COLD PLASMA APPROXIMATION
The second-order amplitude perturbations driven by Alfvén waves are studied. Equations for such second-order perturbations are derived and their solutions are found. The second-order perturbations are shown to be generat...
OBSERVING THE NEUTRON COMPONENT DURING THUNDERSTORM ACTIVITY AT A MOUNTAIN CR STATION
During three summer months in 2015, the Cosmic Ray (CR) station Irkutsk-3000, located at 3000 m above sea level, measured the CR neutron component intensity with the 6NM64 neutron monitor, as well as the atmospheric elec...
INFLUENCE OF STRONG SOLAR PROTON EVENTS ON PROPAGATION OF RADIO SIGNALS IN THE VLF RANGE IN A HIGH-LATITUDE REGION
In this paper, we examine the features of RSDN-20 signal propagation in a high-latitude Earth–ionosphere waveguide during solar proton events, using computational experiment methods. We have analyzed two proton ground-le...