Interannual variation of a 12,760 km transequatorial ionospheric - PowerPoint PPT Presentation

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Interannual variation of a 12,760 km transequatorial ionospheric channel availability and its dependence on ionization Ferran Orga 1 , David Altadill 2 , Marcos Hervs 1 and Rosa Ma Alsina-Pags 1 1 GTM Grup de Recerca en Tecnologies Mdia,

Interannual variation of a 12,760 km transequatorial ionospheric channel availability and its dependence on ionization Ferran Orga 1 , David Altadill 2 , Marcos Hervás 1 and Rosa Ma Alsina-Pagès 1 1 GTM – Grup de Recerca en Tecnologies Mèdia, La Salle – Universitat Ramon Llull; forga@salleurl.edu, mhervas@salleurl.edu, ralsina@salleurl.edu 2 Observatori de l'Ebre, CSIC – Universitat Ramon Llull; david_altadill@obsebre.es
Index 1. Description of the link and the antennas 2. Goals of our paper are presented 3. Sounding diagram 4. General dependence study for the last four surveys 5. Detailed interday dependence for the 2012-13 survey 6. Conclusions 2 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016
Our HF long-haul link La Salle and the Observatori de l’Ebre have been sounding the 12,760 km ionospheric channel from Antarctica (62.7ºS, 299.6ºE) to Spain (41.0ºN, 1.0ºE) during the last 11 years. 3 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016
System Antennas 4 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016
Goals ➔ To prove the relation between the channel availability and the Sun phenomena afgecting the ionization in four consecutive sounding campaigns ➔ To demonstrate the importance of the Sunspot Number index concerning the ionization of the channel ➔ To study a first comparison between the four surveys and to focus in some specific transmissions as examples 5 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016
Diagram of the sounding 6 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016
A Narrowband-Sounding Frame 7 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016
Availability and FLA for the last four surveys 8 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016
Frequencies of Large Availability 9 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016
Two examples of covariance in 2012-13 survey 10 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016
Conclusions ➔ The narrowband propagation has strong dependence on the solar variations due to its influence in the ionospheric performance ➔ 1 st study: the higher the SSN, the higher the Sun activity and the better the performance of our channel in general terms ➔ 2 nd study: when analyzing the interday variation, a strong inverse dependency of the SNR and SSN is shown, delayed around 6 days 11 F. Orga, D. Altadill, M. Hervás and R.M. Alsina-Pagès ECAS 2016

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