UV Microbursts in the Auroral Zone Measured by a Multichannel Imaging Photometer

IF 0.6 4区物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS Cosmic Research Pub Date : 2024-06-17 DOI:10.1134/s0010952524600367

K. D. Shchelkanov, A. A. Belov, P. A. Klimov, V. D. Nikolaeva, R. E. Saraev, S. A. Sharakin

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Abstract

In the autumn of 2021, a multichannel imaging photometer of the Pulsating Aurora Imaging Photometer System was installed at the Verkhnetulomsky Observatory. During the first season of operation (2021/2022), measurements were made over the course of 163 nights in three modes of temporal resolution: 2.5 μs, 320 μs, and 41 ms. The high temporal resolution makes it possible to investigate the fine temporal structure of the emission, which are short (less than 1 s) bursts of UV radiation, so-called “microbursts” that can be single or follow in series. The long-term series of microbursts registered on November 27–29, 2021, were analyzed. It is shown that the series of bursts have a complex temporal structure, individual bursts have several peaks with intervals of 100–400 ms, the intervals between bursts are of the order of 1 s, and they appear in packs lasting from several seconds to minutes. The series appear both in quiet geomagnetic conditions and during substorms; the frequency and amplitude of bursts in the second case are significantly larger.

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用多通道成像光度计测量极光带的紫外线微爆

摘要 2021 年秋季，在上努洛姆斯基天文台安装了脉冲极光成像光度计系统的多通道成像光度计。在第一个运行季节（2021/2022 年），共进行了 163 个夜晚的测量，有三种时间分辨率模式：2.5 μs、320 μs 和 41 ms。高时间分辨率使得研究发射的精细时间结构成为可能，这些发射是紫外线辐射的短脉冲（小于 1 秒），即所谓的 "微爆"，可以是单个的，也可以是串联的。我们分析了 2021 年 11 月 27-29 日记录的长期系列微暴。结果表明，微暴系列具有复杂的时间结构，单个微暴有几个间隔为 100-400 毫秒的峰值，微暴之间的间隔为 1 秒，它们成群出现，持续时间从几秒到几分钟不等。这些脉冲串既出现在安静的地磁条件下，也出现在亚暴期间；在第二种情况下，脉冲串的频率和振幅要大得多。

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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.