太阳日冕分米辐射吸收的探测

V. Bogod, M. Lebedev, N. Ovchinnikova, A. Ripak, E. A. Kurochkin
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摘要

本文介绍了RATAN-600在1 ~ 3ghz范围内对日冕射电辐射的新观测结果。在这一范围内观测的特点是存在来自移动通信、GPS、微波炉、飞机雷达等的强烈工业干扰。与此同时,与磁能转化为耀斑能、日冕加热、窄带现象的作用以及日冕中的准周期脉动有关的问题仍然是研究热点。改变RATAN-600射电望远镜接收光谱设备的概念已成为当务之急。因此,目前正在创建一系列新一代频谱复合体,覆盖RATAN-600从1 GHz到40 GHz的整个工作范围。在本文中,我们介绍了在1-3 GHz (PAS 1-3 GHz)范围内使用全景频谱分析仪进行低对比度日冕结构研究的第一系列观测结果。该设备具有良好的频谱分辨率(超过8000通道/GHz),宽频率范围(超过一个倍频程),高时间分辨率(高达8ms /频谱)和宽动态范围(约90 dB)。从强大的耀斑现象到微弱的结构,再到射电颗粒级,各种物体都可以使用多目标观测模式。为了实时分离有用信号和干扰,开发并实现了一种用于接收、数字化和处理信息的高速管道。这些特点,加上RATAN-600在有效面积和宽频率覆盖方面的能力,使得在1-3 GHz范围内观察弱日冕结构成为可能。结果,日冕等离子体的新特性被发现。这些观测的第一个结果之一是在1520-1630 MHz频段内的窄带吸收登记,靠近OH吸收线(1612-1720 MHz)。讨论了解释日冕中这种吸收性质的可能方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Detection of absorption in the decimeter radio emission of solar corona
The results of new observations of the radio emission of the solar corona in the range of 1– 3 GHz with the RATAN-600 are presented. Observations in this range are characterized by a presence of strong industrial interference from mobile communications, GPS, microwave ovens, aircraft radars, etc. At the same time, problems related to the conversion of magnetic energy into flare energy, coronal heating, the role of narrow-band phenomena, and quasi-periodic pulsations in the solar corona remain topical. Change in the concept of receiving spectral equipment for the RATAN-600 radio telescope has become an urgency. Thus, work is now underway on the creation of a series of new generation spectral complexes covering the entire operating range of RATAN-600 from 1 GHz to 40 GHz. In this article, we present the results of the first series of observations with the Panoramic Analyzer of Spectrum in the range of 1–3 GHz (PAS 1–3 GHz) for studies of low-contrast coronal structures. This equipment has fine spectral resolution (more than 8000 channels/GHz), a wide frequency range (more than an octave), high time resolution (up to 8 ms/spectrum), and a wide dynamic range (about 90 dB). A multi-object observation mode becomes available for various objects, from powerful flare phenomena to faint structures down to the radio granulation level. A high-speed pipeline for receiving, digitizing, and processing information has been developed and implemented in order to separate useful signals and interference in real time. These features, together with the capabilities of the RATAN-600 in terms of effective area and wide frequency coverage, made it possible to observe weak coronal structures in the 1–3 GHz range. As a result, new properties of the coronal plasma were discovered. One of the first results of these observations was the registration of narrow-band absorption in the frequency band 1520–1630 MHz, near the OH absorption line (1612–1720 MHz). Possible ways of explaining the nature of such absorption in the solar corona are discussed.
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