Abstract This paper attempts to analyze the occurrence of ionospheric irregularities using RINEX data obtained from the UNAVCO GNSS station BDMT located in Bahir Dar, Ethiopia ( 11.5998 ° N, 37.3597 ° E) from January to December, 2015 based on the Rate of Change of Total Electron Content(ROTI) values. Large values of ROTI 0.5 are observed in April followed by March and May, but in the remaining months of the year, the values of ROTI are small. April has shown the highest occurrence of ionospheric irregularities, but June shows the lowest occurrence of irregularities. Generally, for seasonal variation, the highest occurrence of ionospheric irregularities occurs during April, March and May and other months show relatively low ionospheric irregularities. We also observed that the occurrence of ionospheric irregularity varies from day to day and is more frequent during the post-sunset hours 18:00UT to 20:00UT(21:00LT to 23:00LT) for both quiet and disturbed days at low latitudes, Bahir Dar, Ethiopia. Finally, from the ROTI values, we have confirmed that ionospheric irregularities that are responsible for ionospheric scintillation are usually nighttime phenomena.


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    Title :

    Nighttime ionospheric irregularities inferred from Rate of Total Electron Content Index (ROTI) values over Bahir Dar, Ethiopia


    Contributors:

    Published in:

    Advances in Space Research ; 67 , 4 ; 1261-1266


    Publication date :

    2020-11-28


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English