Cosmic ray's Effect on Ionospheric Critical Frequencies and Heights - - PowerPoint PPT Presentation

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Cosmic ray's Effect on Ionospheric Critical Frequencies and Heights - - PowerPoint PPT Presentation

Oct 18, 2022 9 likes •180 views

Cosmic ray's Effect on Ionospheric Critical Frequencies and Heights Seray Sahin. (MSc Student) with Marismak, M., Kilcik, A. 1 Akdeniz University Faculty of Science, Department of Space Science and Technologies, Antalya, Turkey The

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Cosmic ray's Effect on Ionospheric Critical Frequencies and Heights

Seray Sahin.

(MSc Student)

with

Marismak, M., Kilcik, A.

1Akdeniz University Faculty of Science, Department of Space Science and Technologies,

Antalya, Turkey The International Space Weather Initiative 20 May – 24 May 2019 Trieste/ITALY

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OUTLINE

1.Introduction 2.Data 3.Method 4.Analysis & Results 5.Summary and Conclusion

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Ionospheric Layers Ionospheric Heights (km) D 50-90 E 90-140 Es 90-140 F 140-600

  • 1-

Ionospheric Layers

The ionosphere is the ionized component of the Earth's upper atmosphere.

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SLIDE 4
  • 2-

Electron density as a function of altitude, and various ionospheric layers

Ionospheric Layers

Solar activiy anti-correlate with the cosmic rays (Atac, 2009).

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SLIDE 5

Data

The investigated time interval covers from January 2006 to December 2017

  • 3-

The ionospheric critical frequency and heights data sets are taken from the Sodankylä Geophysical Observatory at 14:00 for each day. Cosmic ray data are also taken from the same station

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SLIDE 6
  • 4-

Method

Monthly median values of each ionospheric layer data was calculated. The temporal variations of the critical frequencies and heights of each ionospheric layer compared with cosmic ray count. To investigate possible relation between these data sets correlation analysis was applied. Fisher test was also applied to determine to confidence intervals of obtained correlation coefficients.

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Cosmic-Ray & foF2

Correlation Coefficient: -0.74

Difference Cosmic-Ray & foF2

Correlation Coefficient: -0.005

  • 5-

PART 1

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SLIDE 8
  • 6-

Cosmic-Ray & foF1

Correlation Coefficient: -0.45

Difference Cosmic-Ray & foF1

Correlation Coefficient: -0.14

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Cosmic-Ray & foE

Correlation Coefficient: -0.23

Difference Cosmic-Ray & foE

Correlation Coefficient: -0.12

  • 7-
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Cosmic-Ray & foEs

Correlation Coefficient: -0.26

Difference Cosmic-Ray & foEs

Correlation Coefficient: -0.15

  • 8-
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Cosmic-Ray & hF2

Correlation Coefficient: -0.53

Difference Cosmic-Ray & hF2

Correlation Coefficient: -0.22

  • 9-

PART 2

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Cosmic-Ray & hF1

Correlation Coefficient: -0.31

Difference Cosmic-Ray & hF1

Correlation Coefficient: -0.14

  • 10-
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Cosmic-ray & hE

Correlation Coefficient: 0.05

  • 11-
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Cosmic-ray & hES

  • 12-

Correlation Coefficient: -0.08

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SLIDE 15
  • 13-

Correlation C. foF1 foF2 foE foEs Cosmic Rays

  • 0.45
  • 0.73
  • 0.23
  • 0.26

Confidence Intervals ± 0.09 ± 0.17 ± 0.17 ± 0.17 Correlation C. Detrend-foF1 Detrend-foF2 Detrend-foE Detrend-foEs Cosmic Rays

  • 0.14
  • 0.005
  • 0.12
  • 0.15

Correlation C. hF1 hF2 hE hEs Cosmic Rays

  • 0.31
  • 0.53

0.05

  • 0.08

Confidence Intervals ± 0.14 ± 0.16 ± 0.17 ± 0.17 Correlation C. Detrend-hF1 Detrend-hF2 Detrend-hE Detrend-hEs Cosmic Rays

  • 0.22
  • 0.14
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Summary and Conclusion

  • We investigated the possible relation between cosmic rays and

ionospheric critical frequencies and heights.

  • We may conclude that correlations between these data sets

mainly come from the general trend.

  • 14-
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Thank You…

Study is in still progress..