ROLE OF ALPHA PARTICLES IN PENETRATION OF SOLAR WIND DIAMAGNETIC STRUCTURES INTO THE MAGNETOSPHERE
Journal Title: Solar-Terrestrial Physics - Year 2023, Vol 9, Issue 3
Abstract
We present the results of studies showing the presence of simultaneous jumps in the density of protons (N2/N1)p and alpha particles (N2/N1)α at the boundaries of diamagnetic structures (DS) of various types both in the quasi-stationary slow solar wind (SW) and in sporadic SW. For DS of quasi-stationary slow SW, associated with streamer belt or chains, in the statistics considered in the paper there is a single linear dependence of (N2/N1)α on (N2/N1)p. This means that these jumps have the same physical nature and are related to diamagnetism at the boundaries of DS of quasi-stationary SW streams of various types. At the front of interplanetary shock waves (ISW), the (N2/N1)α jump is approximately twice as large as the (N2/N1)p jump. This reflects the features of the collective collisionless plasma heating at ISW fronts and requires further studies. A maximum excess (almost 3 times) of the increase in the alpha-particle density (N2/N1)α over the increase in the proton density (N2/N1)p is observed in eruptive prominences. The magnetospheric response in such phenomena as auroras, proton and alpha particle fluxes, geomagnetic field, and geomagnetic pulsations is similar under the influence of DS of various types and ISW. The detected features of the magnetospheric response to the contact with DS of different types and ISW can be interpreted as impulsive passage of the DS matter (plasmoid) into the magnetosphere. The results of studies of the (N2/N1)α jumps can be used as an additional important argument in identifying cases of impulsive penetration of DS into the magnetosphere and in examining the physical nature of these penetrations.
Authors and Affiliations
Eselevich V. G. , Parhomov V. A.
Keywords
Related Articles
- EP ID EP722175
- DOI 10.12737/stp-93202302
- Views 48
- Downloads 0
Ionospheric response over the high and middle latitude regions of Eurasia according to ionosonde data during the severe magnetic storm in March 2015
We have analyzed spatial and temporal variations in ionospheric parameters over high and middle latitudes of Eurasia, using data from chains of high- and mid-latitude ionosondes during a severe magnetic storm in March 20...
NUMERICAL ANALYSIS OF THE SPATIAL STRUCTURE OF ALFVÉN WAVES IN A FINITE PRESSURE PLASMA IN A DIPOLE MAGNETOSPHERE
We have carried out a numerical analysis of the spatial structure of Alfvén waves in a finite pressure inhomogeneous plasma in a dipole model of the magnetosphere. We have considered three magnetosphere models differing...
SOLAR ACTIVITY CYCLE 25: THE FIRST THREE YEARS
We analyze features of current solar activity cycle 25 for the first three years of its development (2020–2022). Compared to cycle 24, the current cycle is shown to exceed the previous one in the number of sunspot groups...
WAVE ACTIVITY OF THE MESOSPHERE IN THE PLANETARY WAVE RANGE ACCORDING TO OH (3-1) EMISSION OBSERVATIONS AT MAIMAGA AND TIKSI STATIONS FOR 2015–2020
The article compares the interannual variability of the atmosphere at the OH glow height, which can be associated with planetary wave propagation, at stations spaced in latitude. As a characteristic reflecting planetary...
CALIBRATION OF SIBERIAN RADIOHELIOGRAPH ANTENNA GAINS USING REDUNDANCY
The paper describes application of standard gain calibration using redundancy for a 48-antenna prototype of Siberian Radioheliograph. Traditionally, for calibration, the visibilities were measured only between adjacent a...