Asian Journal of Physical and Chemical Sciences

Submit Manuscript


Subscription



Variability of f_o E in Relation to the Solar Indices (R_z and F_(10.7) ) at the Equatorial Ionosphere (Ouagadougou Station)

Asian Journal of Physical and Chemical Sciences, Page 35-41
DOI: 10.9734/ajopacs/2022/v10i2179

Abstract


The correlation coefficients between the critical frequency of the ionosphere E-layer ( foE )and the solar radio flux have not been formally evaluated at the Ouagadougou station. The purpose of this paper is to conduct a study on the variability of the critical frequency of ionosphere E-layer with the solar radio flux (F10.7) and sunspot number (Rz) at the Ouagadougou station. The Ouagadougou station is located at the equatorial ionosphere whose coordinates are: lat: 12.5°N; long: 358.5°E; dip 1.5. Moreover, the local time is equal to the universal time (LT=UT). We worked on the solar cycles 21 and 22 (SC21 and SC22) considering their different phases (minimum, increasing, maximum, and decreasing). The values of foE taken into account are those measured at noon (12:00 LT). The results show a good correlation between foE and Rz, and between foE and F10.7. Thus, the correlation coefficient evaluated between  foE and Rz is 0.96 at SC21 and 0.93 at SC22, and between foE and F10.7 is 0.95 at SC21 and 0.93 at SC22. We subsequently compared foE of the two solar cycles for the same phase. The calculated deviation between the minimum of SC21 and SC22 is 4.46%.  We then find a very small variation of foE from a solar cycle to another at the minimum phase, and this is also verified at the other phases.

Keywords:
  • Critical frequency of E-layer (foE)
  • correlation
  • solar radio flux (F10.7)
  • solar cycle (SC)
  • sunspot number (Rz)

How to Cite

Gédéon, S., Moustapha, K., Roger, N., & Emmanuel, N. (2022). Variability of f_o E in Relation to the Solar Indices (R_z and F_(10.7) ) at the Equatorial Ionosphere (Ouagadougou Station). Asian Journal of Physical and Chemical Sciences, 10(2), 35-41. https://doi.org/10.9734/ajopacs/2022/v10i2179

References

Maris G, Adrian Oncica, Popescu MD. The 22-Year Solar Magnetic Cycle. I. Sunspot and Radio Activity. Romanian Astronomical Journal. 2001;11:13-25.

Clette F, Svalgaard L, Vaquero JM, Cliver EW. Revisiting the Sunspot Number. A 400-Year Perspective on the Solar Cycle. Space Science Reviews. 2014;186:35-103.

Available: https://doi.org/10.1007/s11214-014-0074-2

Kruger A. Introduction to solar radio astronomy and radio physics, Geophys and Astrophys. 1979;16.

Tapping KF. The 10.7 cm solar radio flux (F_10.7). Space weather. 2013;11:394-406.

DOI:10.1002/swe.2006.

Afraimovich EL. Ionospheric effects of the solar flares of September 23, 1998 and July 29, 1999 as deduced from global GPS network data. J. Atmos. Sol. Terr. Phys. 2000;63:1841-1849.

Le H, Liu L, Ren Z, Chen Y, Zhang H, Wan W. A modeling study of global ionospheric and thermospheric responses to extreme solar flare. J. Geophys. Res. Space Physics. 2016;121:832-840.

DOI:10.1002/2015JA021930

Leonovich LA, Afraimovich EL, Romanova EB, Taschilin AV. Estimating the contribution from different ionospheric regions to the TEC response to the solar flares using data from the international GPS network. Ann. Geophys. 2002;20:1935-1941.

Liu JY, Lin CH, Tsai HF, Liou YA. Ionospheric solar flare effects monitored by the ground-based GPS receivers: Theory and observation. J. Geophys. Res. 2004;109:A01307.

DOI:10.1029/2003JA009931

Nogueira PAB. Modeling the equatorial and low-latitude ionospheric response to an intense X-class solar flare. J. Geophys. Res. Space Physics. 2015;120:3021-3032.

DOI:10.1002/2014JA020823.

Tsurutani BT. The October 28, 2003 extreme EUV solar flare and resulting extreme ionospheric effects: Comparison to other Halloween events and the Bastille Day event. Geophys. Res. Lett. 2005; 32:L03S09.

DOI:10.1029/2004GL021475.

Wan W, Liu L, Yuan H, Ning B, Zhang S. The GPS measured SITEC caused by the very intense solar flare on July 14, 2000. Adv. Space Res. 2005;36:2465-2469.

Atulkar A, Mansoori A, Khan PA, Purohit PK. Solar cycle variation and its impact on critical frequency of F layer. Indian Journal of Radio & Space Physics. 2018;47:20-29.

Ouattara F, Amory-Mazaudier C, Fleury R, Lassudrie Duchesne P, Vila P, Petitdidier M. West African equatorial ionospheric parameters climatology based on Ouagadougou ionosonde station data from June 1966 to February 1998. Ann. Geophys. 2009;27:2503–2514

Gédéon S, Roger N, Moustapha K, Emmanuel N. Seasonal Variability of f_o E and Nocturnal Winter Anomaly in E-layer during Solar Cycles 21 and 22 at the Ouagadougou Station. Physical Science International Journal. 2022; 26(2):1-10.

Available:https://doi.org/10.9734/psij/2022/v26i230307

Abe OE, Rabiu AB, Adeniyi JO. Variation of f_o E in the equatorial ionosphere with solar activity. Adv. Space Res. 2013;51: 69-75

Wongcharoen P, Kenpankho P, Sepsirisuk K, Supnithi P, Noppanakeepong S, Lerkvaranyu S, Tsugawa T, Nagatsuma T. International Conference on Space Science and Communication. 2013:978-1-4673-5233-8/13/$31.00 ©2013 IEEE

Yue X, Wan W, Liu W, Ning L, B. An empirical model of ionospheric f_o E over Wuhan, Earth Planets Space. 2006, 58, 323-330.

Kouris, S.S. Muggleton, L.M. Diurnal variation in E-layer ionization. J. Atmos. Terr. Phys. 1973a;35:133-139.

Kouris SS, Muggleton LM. World morphology of Appleton E-layer seasonal anomaly. J. Atmos. Terr. Phys. 1973b;35:141-151.

Muggleton LM. A method of predicting f_o E at any time and place. Telecommunications Journal. 1975; 42:413-418

Danilov AD, Konstantinova AV. Geomagnetism and Aeronomy. 2018; 58(5):629-637.

Karim G, Zerbo JL, M'Bi Kaboré, Ouattara F. Critical Frequency foF2 Variations at Korhogo Station from 1992 to 2001 Prediction with IRI-2012, International Journal of Geophysics. 2019;Article ID 2792101:11.

Available:https://doi.org/10.1155/2019/2792101
  • 67 times
    PDF Download: 32 times

Download Statistics

Make a Submission / Login
Information
Current Issue