Ramazan Atıcı | Muş Alparslan Üniversitesi (original) (raw)

Papers by Ramazan Atıcı

Research paper thumbnail of Prediction of the Ionospheric foF2 Parameter Using R Language Forecasthybrid Model Library Convenient Time Series Functions

Wireless Personal Communications

Research paper thumbnail of The effect of solar and geomagnetıc parameters on total electron content over Ankara, Turkey

Advances in Space Research

Research paper thumbnail of Global investigation of the ionospheric irregularities during the severe geomagnetic storm on September 7–8, 2017

Research paper thumbnail of Forecasting Sunspot Time Series Using Deep Learning Methods

Research paper thumbnail of Lower ionospheric electron density changes following lightning discharges

Research paper thumbnail of Comparison of the QBO and F10.7 Solar Flux Effects on Total Mass Density

Geomagnetism and Aeronomy

Research paper thumbnail of The assessment in terms of QBO of NeQuick 2 model

The Egyptian Journal of Remote Sensing and Space Science

Research paper thumbnail of Comparison of GPS TEC with modelled values from IRI 2016 and IRI-PLAS over Istanbul, Turkey

Astrophysics and Space Science

Research paper thumbnail of The Effect of IMF-Bz and F10.7 Solar Flux on Neutral Molecule Density of Ionospheric E-Region

Journal of Physical Science and Application

In this study, the relationship between the neutral components (N 2 and O 2) in the E-region of t... more In this study, the relationship between the neutral components (N 2 and O 2) in the E-region of the ionosphere (at 110 km altitude) for the Singapore (01.23 N; 103.55 E) station in the equatorial region and the F10.7 solar flux and z-component of Interplanetary Magnetic Field (IMF-Bz) was investigated. This relationship was determined by means of statistical multiple regression model. As a result, it was observed that the changes in F10.7 solar flux and IMF-Bz were inversely proportional to the changes in N 2 and O 2. 92% and 83% of changes in N 2 and O 2 were found to be explained by F10.7 solar flux and IMF-Bz, respectively. When the F10.7 solar flux is changed by 1 s.f.u., it causes a decrease of 2.61×10 14 m-3 in N 2 and 2.96×10 14 m-3 in O 2. Change of 1 nT in IMF-Bz causes a decrease of 9.95×10 15 m-3 in N 2 and 1.69×10 15 m-3 in O 2 .

Research paper thumbnail of The Investigation of Relationship between Solar Parameters and Total Electron Content over Mid-Latitude Ionosphere

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

In this study, the relationship with solar parameters (F10.7 index, proton density and proton spe... more In this study, the relationship with solar parameters (F10.7 index, proton density and proton speed) of the Total Electron Content (TEC) values obtained from IONOLAB and IRI-2012 models is statistically examined during equinox months (March and September) of 2009 over mid-latitude ionosphere for night and day time. As a statistical tool, a multiple regression model is used to determine the relationship between solar parameters and TEC values. At Universal Time (UT) 1200, the explainable rates by solar parameters of TEC changes are calculated as 58% and 55% for IONOLAB TEC values in March and September equinox months, on the other hand these rates are obtained as 99% and 57% for IRI-2012 TEC values. At 2400UT, 57 % and 39 % of changes in IONOLAB and 51 % and 59 % of changes in IRI-2012 TEC values during equinox months could be explainable by solar parameters, respectively. It is observed that the IONOLAB-TEC values are higher than IRI-2012 TEC values on both equinox months. Also, IONOLAB-TEC values on September 2009 are greater than ones on March 2009. When compared to the two models, we concluded that IONOLAB model is more sensitive than IRI-2012 model to the changes occurring in the sun over mid-latitude.

Research paper thumbnail of The relationship between the Quasi Biennial Oscillation and Sunspot Number

Advances in Space Research, 2015

ABSTRACT In this study, the relationship between the monthly mean values of the Quasi Biennial Os... more ABSTRACT In this study, the relationship between the monthly mean values of the Quasi Biennial Oscillation (QBO) measured at 10 hPa and 70 hPa altitudes and Sunspot Number (SSN) for solar maxima and solar minima conditions is analyzed. Before applying the model for the statistical analysis of the study, the stationary of the variables is investigated by using the unit root test. Existence of a long-term relationship between the variables is also investigated by using the co-integration test. Positive and negative relationships between SSN and QBO obtained for 10 hPa and 70 hPa are observed for the solar maxima and the solar minima, respectively. The explainable effects of the SSN on the QBO at 10 hPa altitude are greater than those at 70 hPa. When the calculated coefficients are analyzed, it is observed that the variation of QBO up to 16 m/s is due to SSN. The rest of at least 34 m/s are seen to be based on the other variables.

Research paper thumbnail of The Investigation of Relationship between Solar Parameters and Total Electron Content over Mid-Latitude Ionosphere

Celal Bayar Üniversitesi Fen Bilimleri Dergisi, Sep 30, 2017

In this study, the relationship with solar parameters (F10.7 index, proton density and proton spe... more In this study, the relationship with solar parameters (F10.7 index, proton density and proton speed) of the Total Electron Content (TEC) values obtained from IONOLAB and IRI-2012 models is statistically examined during equinox months (March and September) of 2009 over mid-latitude ionosphere for night and day time. As a statistical tool, a multiple regression model is used to determine the relationship between solar parameters and TEC values. At Universal Time (UT) 1200, the explainable rates by solar parameters of TEC changes are calculated as 58% and 55% for IONOLAB TEC values in March and September equinox months, on the other hand these rates are obtained as 99% and 57% for IRI-2012 TEC values. At 2400UT, 57 % and 39 % of changes in IONOLAB and 51 % and 59 % of changes in IRI-2012 TEC values during equinox months could be explainable by solar parameters, respectively. It is observed that the IONOLAB-TEC values are higher than IRI-2012 TEC values on both equinox months. Also, IONOLAB-TEC values on September 2009 are greater than ones on March 2009. When compared to the two models, we concluded that IONOLAB model is more sensitive than IRI-2012 model to the changes occurring in the sun over mid-latitude.

Research paper thumbnail of ACTA PHYSICA POLONICA A The Eect of Earth's Magnetic Field on the HF Radio Wave Modes at the Heated Subionosphere

In this study, the eect of the actual geometry of the magnetic eld on the electron temperature ha... more In this study, the eect of the actual geometry of the magnetic eld on the electron temperature has been investigated daily and seasonally for the electromagnetic wave travelling at subionosphere. The electron energy balance equation has been obtained by using the ideal gas approximation. The results show that there are notable dierences between the two situations (B k z and B real, z). According to our theoretical study, the maximum changes are shown at L-and R-mode, small eect on X-mode and no variation on O-mode due to the real geometry of the magnetic eld. Besides, the heights of the maximum points are changeable daily and seasonally for all modes at the subionosphere.

Research paper thumbnail of Prediction of the Ionospheric foF2 Parameter Using R Language Forecasthybrid Model Library Convenient Time Series Functions

Wireless Personal Communications

Research paper thumbnail of The effect of solar and geomagnetıc parameters on total electron content over Ankara, Turkey

Advances in Space Research

Research paper thumbnail of Global investigation of the ionospheric irregularities during the severe geomagnetic storm on September 7–8, 2017

Research paper thumbnail of Forecasting Sunspot Time Series Using Deep Learning Methods

Research paper thumbnail of Lower ionospheric electron density changes following lightning discharges

Research paper thumbnail of Comparison of the QBO and F10.7 Solar Flux Effects on Total Mass Density

Geomagnetism and Aeronomy

Research paper thumbnail of The assessment in terms of QBO of NeQuick 2 model

The Egyptian Journal of Remote Sensing and Space Science

Research paper thumbnail of Comparison of GPS TEC with modelled values from IRI 2016 and IRI-PLAS over Istanbul, Turkey

Astrophysics and Space Science

Research paper thumbnail of The Effect of IMF-Bz and F10.7 Solar Flux on Neutral Molecule Density of Ionospheric E-Region

Journal of Physical Science and Application

In this study, the relationship between the neutral components (N 2 and O 2) in the E-region of t... more In this study, the relationship between the neutral components (N 2 and O 2) in the E-region of the ionosphere (at 110 km altitude) for the Singapore (01.23 N; 103.55 E) station in the equatorial region and the F10.7 solar flux and z-component of Interplanetary Magnetic Field (IMF-Bz) was investigated. This relationship was determined by means of statistical multiple regression model. As a result, it was observed that the changes in F10.7 solar flux and IMF-Bz were inversely proportional to the changes in N 2 and O 2. 92% and 83% of changes in N 2 and O 2 were found to be explained by F10.7 solar flux and IMF-Bz, respectively. When the F10.7 solar flux is changed by 1 s.f.u., it causes a decrease of 2.61×10 14 m-3 in N 2 and 2.96×10 14 m-3 in O 2. Change of 1 nT in IMF-Bz causes a decrease of 9.95×10 15 m-3 in N 2 and 1.69×10 15 m-3 in O 2 .

Research paper thumbnail of The Investigation of Relationship between Solar Parameters and Total Electron Content over Mid-Latitude Ionosphere

Celal Bayar Üniversitesi Fen Bilimleri Dergisi

In this study, the relationship with solar parameters (F10.7 index, proton density and proton spe... more In this study, the relationship with solar parameters (F10.7 index, proton density and proton speed) of the Total Electron Content (TEC) values obtained from IONOLAB and IRI-2012 models is statistically examined during equinox months (March and September) of 2009 over mid-latitude ionosphere for night and day time. As a statistical tool, a multiple regression model is used to determine the relationship between solar parameters and TEC values. At Universal Time (UT) 1200, the explainable rates by solar parameters of TEC changes are calculated as 58% and 55% for IONOLAB TEC values in March and September equinox months, on the other hand these rates are obtained as 99% and 57% for IRI-2012 TEC values. At 2400UT, 57 % and 39 % of changes in IONOLAB and 51 % and 59 % of changes in IRI-2012 TEC values during equinox months could be explainable by solar parameters, respectively. It is observed that the IONOLAB-TEC values are higher than IRI-2012 TEC values on both equinox months. Also, IONOLAB-TEC values on September 2009 are greater than ones on March 2009. When compared to the two models, we concluded that IONOLAB model is more sensitive than IRI-2012 model to the changes occurring in the sun over mid-latitude.

Research paper thumbnail of The relationship between the Quasi Biennial Oscillation and Sunspot Number

Advances in Space Research, 2015

ABSTRACT In this study, the relationship between the monthly mean values of the Quasi Biennial Os... more ABSTRACT In this study, the relationship between the monthly mean values of the Quasi Biennial Oscillation (QBO) measured at 10 hPa and 70 hPa altitudes and Sunspot Number (SSN) for solar maxima and solar minima conditions is analyzed. Before applying the model for the statistical analysis of the study, the stationary of the variables is investigated by using the unit root test. Existence of a long-term relationship between the variables is also investigated by using the co-integration test. Positive and negative relationships between SSN and QBO obtained for 10 hPa and 70 hPa are observed for the solar maxima and the solar minima, respectively. The explainable effects of the SSN on the QBO at 10 hPa altitude are greater than those at 70 hPa. When the calculated coefficients are analyzed, it is observed that the variation of QBO up to 16 m/s is due to SSN. The rest of at least 34 m/s are seen to be based on the other variables.

Research paper thumbnail of The Investigation of Relationship between Solar Parameters and Total Electron Content over Mid-Latitude Ionosphere

Celal Bayar Üniversitesi Fen Bilimleri Dergisi, Sep 30, 2017

In this study, the relationship with solar parameters (F10.7 index, proton density and proton spe... more In this study, the relationship with solar parameters (F10.7 index, proton density and proton speed) of the Total Electron Content (TEC) values obtained from IONOLAB and IRI-2012 models is statistically examined during equinox months (March and September) of 2009 over mid-latitude ionosphere for night and day time. As a statistical tool, a multiple regression model is used to determine the relationship between solar parameters and TEC values. At Universal Time (UT) 1200, the explainable rates by solar parameters of TEC changes are calculated as 58% and 55% for IONOLAB TEC values in March and September equinox months, on the other hand these rates are obtained as 99% and 57% for IRI-2012 TEC values. At 2400UT, 57 % and 39 % of changes in IONOLAB and 51 % and 59 % of changes in IRI-2012 TEC values during equinox months could be explainable by solar parameters, respectively. It is observed that the IONOLAB-TEC values are higher than IRI-2012 TEC values on both equinox months. Also, IONOLAB-TEC values on September 2009 are greater than ones on March 2009. When compared to the two models, we concluded that IONOLAB model is more sensitive than IRI-2012 model to the changes occurring in the sun over mid-latitude.

Research paper thumbnail of ACTA PHYSICA POLONICA A The Eect of Earth's Magnetic Field on the HF Radio Wave Modes at the Heated Subionosphere

In this study, the eect of the actual geometry of the magnetic eld on the electron temperature ha... more In this study, the eect of the actual geometry of the magnetic eld on the electron temperature has been investigated daily and seasonally for the electromagnetic wave travelling at subionosphere. The electron energy balance equation has been obtained by using the ideal gas approximation. The results show that there are notable dierences between the two situations (B k z and B real, z). According to our theoretical study, the maximum changes are shown at L-and R-mode, small eect on X-mode and no variation on O-mode due to the real geometry of the magnetic eld. Besides, the heights of the maximum points are changeable daily and seasonally for all modes at the subionosphere.