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Comparison of Solar Wind Speed Estimates from Nearly Simultaneous IPS Observations at 327 and 111 MHz
Solar Physics ( IF 2.8 ) Pub Date : 2021-04-09 , DOI: 10.1007/s11207-021-01804-6
I. V. Chashei , V. R. Lukmanov , S. A. Tyul’bashev , M. Tokumaru

Results are presented of a comparison between solar-wind speed estimates made using the time delays between three pairs of 327 MHz antennas at the Institute for Space-Earth Environmental Research (ISEE) of Nagoya University and by modeling the temporal power spectra observed with the 111 MHz Big Scanning Array (BSA) antenna at the Lebedev Physical Institute (LPI). The observations were made for 6 years in the descending phase of Solar Cycle 24. More than 100 individual records were obtained for the compact source 3C48 and the extended and anisotropic source 3C298. The correlation between the daily speed estimates from 3C48 is 50%. Their annual averages agree within the error estimates and show the expected solar cycle variation. However, the correlation between speeds from 3C298 is only 25% and their annual averages do not agree well. We investigate possible causes of this bias in the 3C298 estimated speeds.



中文翻译:

根据327和111 MHz的几乎同时进行的IPS观测值对太阳风速估算值的比较

给出了结果的比较结果,这些结果是由名古屋大学空间地球环境研究所(ISEE)使用三对327 MHz天线之间的时间延迟进行的太阳风速估算值之间的比较,以及通过对111观测到的瞬时功率谱进行建模而得出的。列别捷夫物理研究所(LPI)的MHz MHz大扫描阵列(BSA)天线。在太阳周期24的下降阶段进行了6年的观测。对于紧凑型源3C48和扩展的各向异性源3C298,获得了100多个单独的记录。根据3C48估算的每日速度之间的相关性为50%。他们的年度平均值在误差估计范围内,并显示出预期的太阳周期变化。但是,从3C298开始的速度之间的相关性仅为25%,并且它们的年度平均值不一致。

更新日期:2021-04-09
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