The Influence of Field-Aligned Currents on Electron Density in the Ionosphere: Combined Observations of SWARM Satellites and ESR Radar

IF 0.6 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Cosmic Research Pub Date : 2023-11-24 DOI:10.1134/s0010952523700454

R. Yu. Lukianova

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Abstract

The results are presented of combined measurements by the SWARM spacecraft (SC) and European incoherent scatter radar on Svalbard for two events of simultaneous observations: in the nighttime ionosphere during substorm activation on January 9, 2014, and in the daytime ionosphere under quiet conditions on February 5, 2017. Onboard magnetometers of the SWARM SC provide measurements of field-aligned current density over the ionosphere. The radar, which is under the flyby trajectory at this time, measures the vertical distribution of the electron density (Ne). Experiments have shown that, under disturbed nighttime conditions, at the location of the field-aligned current flowing from the ionosphere, the plasma density increases throughout the entire slab of the ionosphere and the change in Ne is in agreement with theoretical estimates. In the daytime quiet ionosphere, Ne increases only in the F layer, but practically does not change in the E layer. The differences may be due to the fact that, in the first case, the carriers of the upward directed current are represented by the entire energy spectrum of auroral electrons of 1–10 keV, and in the second case only by the low-energy part.

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场向电流对电离层电子密度的影响:SWARM卫星和ESR雷达的联合观测

摘要介绍了2014年1月9日亚暴激活期间夜间电离层和2017年2月5日安静条件下白天电离层两个同步观测事件的SWARM卫星和欧洲非相干散射雷达联合观测结果。SWARM SC的机载磁力计提供电离层上场对准电流密度的测量。此时位于飞越轨迹下方的雷达测量电子密度(Ne)的垂直分布。实验表明，在夜间受到干扰的条件下，在电离层流出的磁场对准电流的位置，整个电离层的等离子体密度增加，Ne的变化与理论估计一致。在白天安静电离层，Ne仅在F层增加，而在E层几乎没有变化。差异可能是由于在第一种情况下，向上定向电流的载流子由1-10 keV的极光电子的整个能谱表示，而在第二种情况下仅由低能量部分表示。

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来源期刊

Cosmic Research 地学天文-工程：宇航

CiteScore

1.10

自引率

33.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Cosmic Research publishes scientific papers covering all subjects of space science and technology, including the following: ballistics, flight dynamics of the Earth’s artificial satellites and automatic interplanetary stations; problems of transatmospheric descent; design and structure of spacecraft and scientific research instrumentation; life support systems and radiation safety of manned spacecrafts; exploration of the Earth from Space; exploration of near space; exploration of the Sun, planets, secondary planets, and interplanetary medium; exploration of stars, nebulae, interstellar medium, galaxies, and quasars from spacecraft; and various astrophysical problems related to space exploration. A chronicle of scientific events and other notices concerning the main topics of the journal are also presented.