Highlights To study the D-region response during July 22 2009 total solar eclipse. A decrease of ∼6.2dB in VLF signal strength in D-region electron density. D-region electron density estimated from model shows 95% depletion at 71km. Results show a change of ∼7km and 0.055km−1 in h′ and β parameters.

    Abstract In this paper, we analyze VLF signals received at Busan to study the the D-region changes linked with the solar eclipse event of 22 July 2009 for very short (∼390km) transmitter–receiver great circle path (TRGCP) during local noon time 00:36–03:13UT (09:36–12:13KST). The eclipse crossed south of Busan with a maximum obscuration of ∼84%. Observations clearly show a reduction of ∼6.2dB in the VLF signal strength at the time of maximum solar obscuration (84% at 01:53UT) as compared to those observed on the control days. Estimated values of change in Wait ionospheric parameters: reflection height (h′) in km and inverse scale height parameter (β) in km−1 from Long Wave Propagation Capability (LWPC) model during the maximum eclipse phase as compared to unperturbed ionosphere are 7km and 0.055km−1, respectively. Moreover, the D-region electron density estimated from model computation shows 95% depletion in electron density at the height of ∼71km. The reflection height is found to increase by ∼7km in the D-region during the eclipse as compared to those on the control days, implying a depletion in the Lyman-α flux by a factor of ∼7. The present observations are discussed in the light of current understanding on the solar eclipse induced D-region dynamics.


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    Titel :

    Response of the mid-latitude D-region ionosphere to the total solar eclipse of 22 July 2009 studied using VLF signals in South Korean peninsula


    Beteiligte:
    Phanikumar, D.V. (Autor:in) / Kwak, Y.-S. (Autor:in) / Patra, A.K. (Autor:in) / Maurya, A.K. (Autor:in) / Singh, Rajesh (Autor:in) / Park, S.-M. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 54 , 6 ; 961-968


    Erscheinungsdatum :

    2014-06-02


    Format / Umfang :

    8 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch