Impact of the Solar Activity Variations on the Low-Latitude Day-to-Day Variability of NmF2 During Geomagnetically Quiet Conditions Obtained from the Huancayo and Jicamarca Ionosonde Observations

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-06-10 DOI:10.1007/s00024-024-03503-2
A. V. Pavlov, N. M. Pavlova
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Abstract

The statistical characteristics of the day-to-day variability of the F2-layer peak electron number density, NmF2, measured by the low-latitude Huancayo and Jicamarca ionosondes are studied for each month, M, in a year for geomagnetically quiet conditions at low and moderate solar activity during the time period from 1957 to 2022. The NmF2 statistical parameters under study are the mathematical expectation NmF2E, the arithmetically average NmF2A, the standard deviations σE(UT,M), and the variation coefficient CVE(UT,M) of NmF2 relative to NmF2E, where UT is the universal time. It is found that the value of CVE(UT,M) that determines the relative day-to-day variability of NmF2 is changed in the intervals of 15–68% and 14–68% for the low and moderate solar activity conditions, respectively. The comparison of CVE(UT,M) for the low and moderate solar activity conditions under consideration shows for the first time that the increase in the solar activity level increases or decreases the relative day-to-day NmF2 variability in the range from − 24 to 15%. In the vast majority of cases the considered increase in the solar activity level decreases the relative day-to-day NmF2 variability while the longest periods of the corresponding increase in the relative day-to-day NmF2 variability occur in April.

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从万卡约和 Jicamarca 电离层观测获得的地磁静止条件下太阳活动变化对低纬度 NmF2 日间变化的影响
研究了 1957 年至 2022 年期间低纬度万卡约和 Jicamarca 电离探空仪测量的 F2 层峰值电子数密度 NmF2 的逐日变化统计特征。研究的 NmF2 统计参数包括数学期望 NmF2E、算术平均 NmF2A、标准偏差 σE(UT,M)和 NmF2 相对于 NmF2E 的变化系数 CVE(UT,M),其中 UT 为全球时间。结果发现,在低太阳活动和中太阳活动条件下,决定 NmF2 相对日变率的 CVE(UT,M) 值变化区间分别为 15-68% 和 14-68%。对低度和中度太阳活动条件下的 CVE(UT,M)进行比较后首次发现,太阳活动水平的增加会使 NmF2 的相对日变化率在-24%到 15%的范围内增大或减小。在绝大多数情况下,太阳活动水平的增加会降低 NmF2 的相对逐日变化率,而 NmF2 的相对逐日变化率相应增加的最长时期出现在 4 月份。
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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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