Scholarlink

In this paper, we analyze the ionospheric F2 layer critical frequency (foF2) and maximum height (hmF2) during the decline phase of solar cycle 24, for the years 2014–2019. The observed values are taken from the ionosonde, and the model values are from the IRI model. We took data for the northern hemisphere of Rome, Italy (Geog. Lat. 41.90° N, Geog. Long. 12.50° E) and the southern hemisphere of Hermanus, South Africa (Geog. Lat. –34.42° S, Geog. Long. 19.22° E). First, we study the annual and semiannual anomalies throughout the years 2014–2019. The results indicate the presence of an annual anomaly in the northern hemisphere throughout the years 2014–2019, while it was absent in the southern hemisphere. Furthermore, the semiannual analysis of foF2 and hmF2 data reveals that the average means of equinox months consistently had higher values compared to solstice months across all the years 2014–2019, and this finding shows the presence of a semiannual anomaly at mid-latitudes in both hemispheres. To assess the accuracy of the observed values, a comparison was made with the International Reference Ionospheric Model (IRI-2016), utilizing the Consultative Committee for International Radio (CCIR) option for foF2 values and the SHU-2015 option for hmF2 values. The results demonstrate a strong correlation above 0.90 for both hemispheres and parameters indicating a close agreement between the observed values and the model predictions.

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A Comparative Study of Ionospheric Parameters at Both Hemispheres During the Decline Phase of 24th Solar Cycle

  • 会议论文

  • 发表日期：

    2025年

查看全文
  • Pramod Purohit,
  • Rafi Ahmad,
  • Bhupendra Malvi,
  • Shivangi Bhardwaj

摘要

In this paper, we analyze the ionospheric F2 layer critical frequency (foF2) and maximum height (hmF2) during the decline phase of solar cycle 24, for the years 2014–2019. The observed values are taken from the ionosonde, and the model values are from the IRI model. We took data for the northern hemisphere of Rome, Italy (Geog. Lat. 41.90° N, Geog. Long. 12.50° E) and the southern hemisphere of Hermanus, South Africa (Geog. Lat. –34.42° S, Geog. Long. 19.22° E). First, we study the annual and semiannual anomalies throughout the years 2014–2019. The results indicate the presence of an annual anomaly in the northern hemisphere throughout the years 2014–2019, while it was absent in the southern hemisphere. Furthermore, the semiannual analysis of foF2 and hmF2 data reveals that the average means of equinox months consistently had higher values compared to solstice months across all the years 2014–2019, and this finding shows the presence of a semiannual anomaly at mid-latitudes in both hemispheres. To assess the accuracy of the observed values, a comparison was made with the International Reference Ionospheric Model (IRI-2016), utilizing the Consultative Committee for International Radio (CCIR) option for foF2 values and the SHU-2015 option for hmF2 values. The results demonstrate a strong correlation above 0.90 for both hemispheres and parameters indicating a close agreement between the observed values and the model predictions.