Solar wind temperature–velocity relationship over the last five solar cycles and Forbush decreases associated with different types of interplanetary disturbance
| العنوان: | Solar wind temperature–velocity relationship over the last five solar cycles and Forbush decreases associated with different types of interplanetary disturbance |
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| المؤلفون: | A. A. Abunin, Maria Abunina, E. A. Eroshenko, A. V. Belov, A. A. Melkumyan, V. A. Oleneva, Victor Yanke |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 500:2786-2797 |
| بيانات النشر: | Oxford University Press (OUP), 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Methods statistical, Physics, Solar wind, Disturbance (geology), 010504 meteorology & atmospheric sciences, Space and Planetary Science, 0103 physical sciences, Astronomy and Astrophysics, Interplanetary spaceflight, Atmospheric sciences, 010303 astronomy & astrophysics, 01 natural sciences, 0105 earth and related environmental sciences |
| الوصف: | The behaviour of the solar wind (SW) proton temperature and velocity and their relationship during Forbush decreases (FDs) associated with various types of solar source – coronal mass ejections (CMEs) and coronal holes (CHs) – have been studied. Analysis of cosmic ray variations, SW temperature, velocity, density, plasma beta, and magnetic field (from 1965–2019) is carried out using three databases: the OMNI database, Variations of Cosmic Rays database (IZMIRAN) and Forbush Effects & Interplanetary Disturbances database (IZMIRAN). Comparison of the observed SW temperature (T) and velocity (V) for the undisturbed SW allows us to derive a formula for the expected SW temperature (Texp, the temperature given by a T–V formula, if V is the observed SW speed). The results reveal a power-law T–V dependence with a steeper slope for low speeds (V < 425 km s−1, exponent = 3.29 ± 0.02) and flatter slope for high speeds (V > 425 km s−1, exponent = 2.25 ± 0.02). A study of changes in the T–V dependence over the last five solar cycles finds that this dependence varies with solar activity. The calculated temperature index KT = T/Texp can be used as an indicator of interplanetary and solar sources of FDs. It usually has abnormally large values in interaction regions of different-speed SW streams and abnormally low values inside magnetic clouds (MCs). The results obtained help us to identify the different kinds of interplanetary disturbance: interplanetary CMEs, sheaths, MCs, corotating interaction regions, high-speed streams from CHs, and mixed events. |
| تدمد: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staa3366 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::0dcc61ea17fc555b3a2bc003862b249a https://doi.org/10.1093/mnras/staa3366 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........0dcc61ea17fc555b3a2bc003862b249a |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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| DOI: | 10.1093/mnras/staa3366 |