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The impact of CMEs on the critical frequency of F2-layer ionosphere (foF2)

Published online by Cambridge University Press:  29 January 2021

Alene Seyoum ,
Nat Gopalswamy ,
Melessew Nigussie  and
Nigusse Mezgebe
Alene Seyoum
Affiliation:
Ethiopian Space Science and Technology Institute (ESSTI), Addis Ababa, Ethiopia Dire Dawa University, College of Natural and Computational Science, Physics Department, Dire Dawa, Ethiopia
Nat Gopalswamy
Affiliation:
NASA Goddard Space Flight Center, Greenbelt, MD20771, USA email: [email protected].
Melessew Nigussie
Affiliation:
Washera Geospace and Radar Science Laboratory, College of Science, Physics Department, Bahir Dar University, Bahir Dar, Ethiopia
Nigusse Mezgebe
Affiliation:
Ethiopian Space Science and Technology Institute (ESSTI), Addis Ababa, Ethiopia
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Abstract

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The ionospheric critical frequency (foF2) from ionosonde measurements at geographic high, middle, and low latitudes are analyzed with the occurrence of coronal mass ejections (CMEs) in long term variability of the solar cycles. We observed trends of monthly maximum foF2 values and monthly averaged values of CME parameters such as speed, angular width, mass, and kinetic energy with respect to time. The impact of CMEs on foF2 is very high at high latitudes and low at low latitudes. The time series for monthly maximum foF2 and monthly-averaged CME speed are moderately correlated at high and middle latitudes.

Keywords

CME impactcritical frequencyionospheremaximum foF2geographic latitudes
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 400 - 402
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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