Now showing items 1-15 of 15

    • Determining F2 layer parameters via optimization using IRI model and IONOLAB TEC estimations 

      Şahin, O.; Sezen, U.; Arıkan, F.; Arıkan, Orhan (IEEE, 2011)
      We know that F2 layer of the ionosphere is most important layer in the progaration of high frequency (HF) waves. In this study, The relation of the height (HmF2) and the critical frequency (FoF2) of F2 layer-among the ...
    • Dynamo equation solution using Finite Volume Method for midlatitude ionosphere 

      Arikan, F.; Sezen, U.; Arıkan, Orhan (KeAi Communications Co., 2018)
      Ionosphere is the layer of atmosphere which plays an important role both in space based navigation, positioning and communication systems and HF signals. The structure of the electron density is a function of spatio-temporal ...
    • Estimation of hmF2 and foF2 communication parameters of ionosphere F2-layer üsing GPS data and IRI-plas model 

      Sezen, U.; Sahin, O.; Arikan, F.; Arıkan, Orhan (IEEE, 2013-10)
      F2-layer is the most important and characteristic layer of the ionosphere in the propagation of high frequency (HF) waves due to the highest level of conductivity in the propagation path. In this study, the relation of ...
    • Estimation of single station interfrequency receiver bias using GPS-TEC 

      Arikan, F.; Nayir, H.; Sezen, U.; Arıkan, Orhan (Wiley-Blackwell Publishing, Inc., 2008)
      Dual-frequency Global Positioning System (GPS) receivers present a plausible and cost-effective way of computing Total Electron Content (TEC). For accurate estimates of TEC, frequency-dependent satellite and receiver ...
    • Investigation of ionospheric precursors of 23 October 2011 Mw=7.2 earthquake in Van, Turkey 

      Deviren, M. N.; Arıkan, F.; Sezen, U.; Arıkan, Orhan (EGU, 2012-04)
      In recent years, a strong coupling between ionospheric disturbances and seismic activity has been observed through the increase of ion temperatures, critical frequencies of ionospheric layers and Total Electron Content ...
    • Ionolab grubunun iyonküre uzaktan algılama ve 2-b görüntüleme çalışmaları 

      Arıkan, F.; Toker, C.; Sezen, U.; Deviren, M. N.; Çilibaş, O.; Arıkan, Orhan (IEEE, 2014-04)
      Bu çalışmada, IONOLAB grubunun son 10 yıldır iyonküre uzaktan algılaması ve 2-B görüntüleme çalışmaları özetlenecektir. TÜBİTAK EEEAG 105E171 ve 109E055 projelerinde, çift frekanslı Yerküresel Konumlama Sistemi (YKS) ...
    • NVIS HF signal propagation in ionosphere using calculus of variations 

      Sezen, U.; Arikan, F.; Arıkan, Orhan (KeAi Communications Co., 2018)
      Modeling Near Vertical Incidence Sounding (NVIS) High Frequency (HF) signal propagation in the ionosphere is important. Because, ionosondes which are special types of radars probing the ionosphere with certain HF frequencies ...
    • Observed Ionospheric Effects of 23 October 2011 Van, Turkey Earthquake 

      Arikan, F.; Deviren, M.N.; Lenk, O.; Sezen, U.; Arıkan, Orhan (Taylor and Francis, 2012-01-17)
      On 23 October 2011, a very strong earthquake with a magnitude of Mw = 7.2 shook Eastern Anatolia, and tremors were felt up to 500 km from the epicentre. In this study, we present an early analysis of ionospheric disturbance ...
    • Online user‐friendly slant total electron content computation from IRI‐Plas: IRI‐Plas‐STEC 

      Tuna, H.; Arıkan, Orhan; Arikan, F.; Gulyaeva, T. L.; Sezen, U. (Wiley-Blackwell Publishing, Inc., 2014-01)
      Slant total electron content (STEC), the total number of free electrons on a ray path, is an important space weather observable. STEC is the main input for computerized ionospheric tomography (CIT). STEC can be estimated ...
    • Online, automatic, near-real time estimation of GPS-TEC: IONOLAB-TEC 

      Sezen, U.; Arikan, F.; Arıkan, Orhan; Ugurlu, O.; Sadeghimorad, A. (IEEE, 2013)
      The variability of space weather can best be captured using total electron content (TEC), which corresponds to total number of electrons on a ray path. The dual-frequency ground based GPS receivers provide a cost-effective ...
    • Optimization of F2 layer parameters using IRI-Plas and IONOLAB-TEC 

      Şahin O.; Sezen, U.; Arikan F.; Arıkan, Orhan (IEEE, 2011)
      In this study, the relation of the maximum ionization height (HmF2) and the critical frequency (FoF2) of F2 layer is examined within their parametric range through the International Reference Ionosphere extended towards ...
    • Optimization of F2 layer parameters using IRI-Plas model and IONOLAB Total Electron Content 

      Sahin O.; Sezen, U.; Arikan F.; Arıkan, Orhan; Aktug, B. (IEEE, 2011)
      In this study, the relation of the maximum ionization height (HmF2) and the critical frequency (FoF2) of F2 layer is examined within their parametric range through the International Reference Ionosphere extended towards ...
    • Space weather activities of IONOLAB group using TNPGN GPS Network 

      Aktug, B.; Lenk O.; Kurt, M.; Parmaksiz, E.; Ozdemir, S.; Arikan F.; Sezen, U.; Toker, C.; Arıkan, Orhan (IEEE, 2011)
      Characterization and constant monitoring of variability of the ionosphere is of utmost importance for the performance improvement of HF communication, Satellite communication, navigation and guidance systems, Low Earth ...
    • Space weather studies of IONOLAB group 

      Arıkan, F.; Sezen, U.; Toker, C.; Artuner, H.; Bulu, G.; Demir, U.; Erdem, E.; Arıkan, Orhan; Tuna, Hakan; Gulyaeva, T. L.; Karatay, S.; Mosna, Z. (IEEE, 2016)
      IONOLAB is an interdisciplinary research group dedicated for handling the challenges of near earth environment on communication, positioning and remote sensing systems. IONOLAB group contributes to the space weather studies ...
    • Space-time interpolation and automatic mapping of TEC using TNPGN-active 

      Arıkan, F.; Arıkan, Orhan; Sezen, U.; Toker, C.; Aktug, B.; Lenk, O.; Kurt ,M.; Parmaksız, E. (2011-08)
      Turkish National Permanent GPS Network (TNPGN) is the Reference Station Network of 146 continuously-operating GNSS stations o which are distributed uniformly across Turkey and North Cyprus Turkish Republic since May 2009. ...