A Statistical Study of the CME Properties Based on Angular Width during the Solar Cycle 24

IF 0.5 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS

Kinematics and Physics of Celestial Bodies Pub Date : 2024-08-27 DOI:10.3103/s0884591324040032

Hemlata Dharmashaktu, N. K. Lohani

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Abstract

The present work is carried out in order to analyze the data for more than 15 000 coronal mass ejections (CMEs) during solar cycle 24, spanning the period of 2009–2017. We investigated, the properties of two categories of CMEs, narrow (W ≤ 20°) and normal (W > 20°), including angular width, linear speed, acceleration and their location. Based on statistical analysis, it is found the following. (1) 45% of the CMEs found in the angular range of W ∼ 10° and 30° with peak at 15°. (2) 70% of the narrow and 60% normal CMEs speed lies in the range of 150–400 km/s. The occurrence rate of both categories of CMEs declines sharply at linear speeds > 400 km/s and 0.1% narrow while 1.95% are of normal category, having the speeds above than 1000 km/s. (3) The 99% of narrow and 82% of normal CMEs are biased towards deceleration whereas small portion of normal CMEs do move with positive acceleration. We observed a low correlation between linear speed and acceleration –0.13 and –0.24 for narrow and normal CMEs respectively. (4) The latitudinal distribution of almost all narrow and normal CMEs were observed from equatorial regions during solar minimum, while during solar maximum, the distribution becomes wider and appears at all latitudes for both catagories. Despite of the fact that, solar cycle 24 is a weaker one in terms of geoeffectivity, but we observe a greater number of CMEs than solar cycle 23 throughout the solar maximum.

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基于太阳周期 24 期间角宽度的 CME 特性统计研究

摘要本研究分析了2009-2017年太阳周期24期间15 000多次日冕物质抛射（CMEs）的数据。我们研究了两类日冕物质抛射的特性，窄日冕物质抛射（W ≤ 20°）和正常日冕物质抛射（W > 20°），包括角宽度、线速度、加速度及其位置。根据统计分析，可以发现以下几点。(1）45%的 CMEs 发现于 W ∼ 10° 和 30° 的角度范围内，峰值在 15°。(2）70%的窄CME和60%的正常CME速度在150-400千米/秒之间。(3) 99%的窄型和82%的正常型CME都偏向于减速，而小部分正常型CME则以正加速度运动。我们观察到窄加速度和正常加速度的线速度和加速度之间的相关性很低，分别为-0.13和-0.24。(4) 在太阳最小期间，几乎所有的窄向和正常 CME 的纬度分布都是在赤道地区观测到的，而在太阳最大期间，这两类 CME 的纬度分布变得更广，出现在所有纬度地区。尽管就地球效应而言，太阳周期 24 是一个较弱的周期，但在整个太阳极大期，我们观测到的 CMEs 数量要多于太阳周期 23。

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来源期刊

Kinematics and Physics of Celestial Bodies ASTRONOMY & ASTROPHYSICS-

CiteScore

0.90

自引率

40.00%

发文量

审稿时长

>12 weeks

期刊介绍： Kinematics and Physics of Celestial Bodies is an international peer reviewed journal that publishes original regular and review papers on positional and theoretical astronomy, Earth’s rotation and geodynamics, dynamics and physics of bodies of the Solar System, solar physics, physics of stars and interstellar medium, structure and dynamics of the Galaxy, extragalactic astronomy, atmospheric optics and astronomical climate, instruments and devices, and mathematical processing of astronomical information. The journal welcomes manuscripts from all countries in the English or Russian language.