VARIATIONS OF FLOW DIRECTION IN SOLAR WIND STREAMS OF DIFFERENT TYPES

Journal Title: Solar-Terrestrial Physics - Year 2021, Vol 7, Issue 4

Abstract

Studying the direction of the solar wind flow is a topical problem of space weather forecasting. As a rule, the quiet and uniform solar wind propagates radially, but significant changes in the solar wind flow direction can be observed, for example, in compression regions before the interplanetary coronal mass ejections (Sheath) and Corotating Interaction Regions (CIR) that precede high-speed streams from coronal holes. In this study, we perform a statistical analysis of the longitude (φ) and latitude (θ) flow direction angles and their variations on different time scales (30 s and 3600 s) in solar wind large-scale streams of different types, using WIND spacecraft data. We also examine the relationships of the value and standard deviations SD of the flow direction angles with various solar wind parameters, regardless of the solar wind type. We have established that maximum values of longitude and latitude angle modulus, as well as their variations, are observed for Sheath, CIR, and Rare, with the probability of large deviations from the radial direction (>5°) increasing. The dependence on the solar wind type is shown to decrease with scale. We have also found that the probability of large values of SD(θ) and SD(φ) increases with increasing proton temperature (Tp) in the range 5–10 eV and with increasing proton velocity (Vp) in the range 400–500 km/s.

Authors and Affiliations

Moskaleva A. V. , Riazantseva M. O. , Yermolaev Yu. I. , Lodkina I. G.

Keywords

Related Articles

COHERENT MICROWAVE EMISSION AS AN INDICATOR OF NON-THERMAL ENERGY RELEASE AT A CORONAL X-RAY POINT

A response has been found in a narrow band 5–7 GHz of microwave emission to the appearance of a coronal X-ray point. The emission source is a short X-ray loop located in the tail part of an active region and occurring wh...

SPACE WEATHER: RISK FACTORS FOR GLOBAL NAVIGATION SATELLITE SYSTEMS

Extreme space weather events affect the stability and quality of the global navigation satellite systems (GNSS) of the second generation (GPS, GLONASS, Galileo, BeiDou/Compass) and GNSS augmentation. We review the theory...

On possible relation of earthquakes with the sign change of the interplanetary magnetic field radial component

This work is devoted to an experimental study of the possible relationship between earthquakes and interplanetary magnetic field (IMF) variations. For the analysis, we use world and regional catalogs of earthquakes and a...

ASTROCLIMATIC STATISTICS AT THE SAYAN SOLAR OBSERVATORY

The paper analyzes meteorological and optical characteristics of the atmosphere at the Sayan Solar Observatory (SSO) and the future 3 m Large Solar Telescope (LST-3). We examine spatial features of changes in astroclimat...

DAYTIME ELECTRON DENSITY AT IONOSPHERIC F1-LAYER HEIGHTS DURING GEOMAGNETIC STORMS (IRKUTSK)

We have examined variations in electron density Ne at ionospheric F1-layer heights during geomagnetic storms at the Irkutsk ionospheric station (52° N, 104° E). We have selected geomagnetic storms of varying intensity as...

Download PDF file
  • EP ID EP700036
  • DOI 10.12737/stp-74202102
  • Views 84
  • Downloads 0

How To Cite

Moskaleva A. V. , Riazantseva M. O. , Yermolaev Yu. I. , Lodkina I. G. (2021). VARIATIONS OF FLOW DIRECTION IN SOLAR WIND STREAMS OF DIFFERENT TYPES. Solar-Terrestrial Physics, 7(4), -. https://europub.co.uk/articles/-A-700036