, Volume 32, Issue 1, pp 59–65 | Cite as

Dependence of Coherence Scales of Ionospheric Scintillation Patterns on Magnetic Activity

  • G. A. Chavan
  • A. K. Sharma
  • O. B. Gurav
  • H. P. Gaikwad
  • D. P. Nade
  • S. S. Nikte
  • R. N. Ghodpage
  • P. T. Patil
Short Communication


The amplitude scintillation data, recorded at 251 MHz by two spaced receivers at low latitude station Kolhapur [16.42oN, 74.2oE] are used. We have considered data of magnetically disturbed days (Ap > 20) to investigate the effect of magnetic activity on the ionospheric irregularities by observing the coherence scales of the scintillation pattern produced by the irregularities. The coherence scales are calculated using the method introduced by Bhattacharyya et al. (2003). Coherence scale lengths on magnetically disturbed days are higher than that of on quiet days. During magnetically disturbed period the coherence scales in the post midnight period are greater than that of in the pre midnight period. This suggests that magnetospheric electric field generated in storm time causes increase in coherence scales but shows large increase after midnight.


Ionospheric irregularity Magnetic activity Coherence scale length Amplitude scintillation 



We thank the Director, Indian Institute of Geomagnetism (IIG), Navi Mumbai, for prividing the amplitude scintillation data under scientific collaboration programme (MoU) between IIG and Shivaji University, Kolhapur. Thanks are also due to Dr. S. Sripathi (IIG) for providing data of ionosonde. Authors wish to thank the anonymous reviewers for their suggestions, which has helped to improve the paper.


  1. [1]
    A. Bhattacharyya and R.G. Rastogi, Structure of Ionospheric Irregularities From Amplitude and Phase Scintillation Observations, Radio Sci., 26 (1991) 439–449.ADSCrossRefGoogle Scholar
  2. [2]
    S. Basu, S. Basu, J. Aarons, J.P. Mcclure and A.D. Cousins, On the Coexistence of Kilometer and Meter-Scale Irregularities in the Night Time Equatorial F Region, J. Geophys. Res., 83 (1978) 4219–4226.ADSCrossRefGoogle Scholar
  3. [3]
    B.M. Pathan and D.R.K. Rao, Seasonal and Solar Cycle Association of Zonal Drifts of Ionospheric Plasma Irregularities in the Indian Equatorial Region, Ann. Geophys., 14 (1996) 297–303.ADSCrossRefGoogle Scholar
  4. [4]
    B.G. Fejer, L. Scherliess and E.R. de Paula, Effects of the Vertical Plasma Drift Velocity on the Generation and Evolution of Equatorial Spread F, J. Geophys. Res., 104 (1999) 859–869.CrossRefGoogle Scholar
  5. [5]
    H. Kil and R.A. Heelis, Global Distribution of Density Irregularities in the Equatorial Ionosphere, J. Geophys. Res., 103 (1998) 407–417.ADSCrossRefGoogle Scholar
  6. [6]
    R.S. Lynn, K. Gardiner-Garden and A. Heitmann, The Observed Compression and Expansion of the F2 Ionosphere as a Major Component of Ionospheric Variability, Radio Sci., 51 (2016) 538–552.ADSCrossRefGoogle Scholar
  7. [7]
    M. Abdullah, J.S. Mandeep, S. Zainuddin, S. Abdullah and A.F.M. Zain, Variations of foF2 Prior to Earthquakes, MAPAN-J. Metrol. Soc. India, 27(1), (2011), 13–22.Google Scholar
  8. [8]
    B.G. Fejer, Low Latitude Electrodynamic Plasma Drifts: A Review, J. Atmos. Terr. Phys., 53 (1991) 677–693.ADSCrossRefGoogle Scholar
  9. [9]
    B.G. Fejer and L. Scherliess, Time Dependent Response of Equatorial Ionospheric Electric Fields to Magnetospheric Disturbances. Geophys. Res. Lett., 22 (1995) 851–854.ADSCrossRefGoogle Scholar
  10. [10]
    Su. Basu, S. Basu, C.E. Valladares, H.C. Yeh, S.Y. Su, E. MacKenzie, P.J. Sultan, J. Aarons, F. J. Rich, P. Doherty, K.M. Groves and T.W. Bullett, Ionospheric Effects of Major Magnetic Storms During the International Space Weather Period of September and October 1999: GPS Observations, VHF/UHF Scintillations, and In Situ Density Structures at Middle and Equatorial Latitudes, J. Geophys. Res., 106 (2001) 389–413.Google Scholar
  11. [11]
    A. Bhattacharyya, S. Basu and K.M. Groves, C.E. Valladares and R. Sheehan, Effect of Magnetic Activity on the Dynamics of Equatorial F Region Irregularities, J. Geophys. Res., 107 (2002) 1489–1495.Google Scholar
  12. [12]
    J. Hanumath Sastri, N. Jyoti, V.V. Somayajulu, H. Chandra and C.V. Devasia, Ionospheric Storm of Early November 1993 in the Indian Equatorial Region, J. Geophys. Res., 105 (2000) 443–455.CrossRefGoogle Scholar
  13. [13]
    B. Engavale, K. Jeeva, K.U. Nair and A. Bhattacharyya, Solar Flux Dependence of Coherence Scales in Scintillation Patterns Produced by ESF Irregularities, Ann. Geophys., 23 (2005) 3261–3266.ADSCrossRefGoogle Scholar
  14. [14]
    A.K. Singh, R.P. Patel and R.P. Singh, Statistical Features of Overhead Ionospheric Irregularities and Its Generation Mechanism at Low Latitude, J. Atmos. Terr. Phys., 68 (2006) 1116–1124.ADSCrossRefGoogle Scholar
  15. [15]
    M.J. Keskinen, S.L. Ossakow and B.G. Fejer, Three-Dimensional Nonlinear Evolution of Equatorial Ionospheric Spread-F Bubbles, Geophys. Res. Lett., 30 (2003) 1855–1858.ADSCrossRefGoogle Scholar
  16. [16]
    P.T. Patil1, R.N. Ghodpage, A. Taori, R.P. Patil, S. Gurubaran, S. Nikte, D.P. Nade, A.K. Sharma, S. Banola,V. LakshmiNarayanan and D. Siingh, The Study of Equatorial Plasma Bubble During January to April 2012 Over Kolhapur (India), Ann. Geophys., 59(2), (2016), 1–20.Google Scholar
  17. [17]
    A.W. Wernik, L. Alfonsi and M. Materassi, Ionospheric Irregularities, Scintillation and Its Effect on Systems, Acta Geophys. Pol., 52 (2004) 237–249.Google Scholar
  18. [18]
    A. Bhattacharyya, B. Kakad, S. Sripathi, K. Jeeva and K.U. Nair, Development of Intermediate Scale Structure Near the Peak of the F Region Within an Equatorial Plasma Bubble, J. Geophys. Res., 119 (2014) 3066–3076.CrossRefGoogle Scholar
  19. [19]
    A. Bhattacharyya, K.M. Groves, S. Basu and H. Kuenzler, C.E. Valladares and R. Sheehan, L-Band Scintillation Activity and Space-Time Structure of Low-Latitude UHF Scintillations, Radio Sci., 38 (2003) 1004–1012.ADSCrossRefGoogle Scholar
  20. [20]
    B.H. Briggs, The Analysis of Spaced Sensor Records by Correlation Techniques, Middle Atmosphere Program: Handbook for MAP, Ground-Based Techniques, (ed. Vincent, R. A.), 13 (1984) 166–186.Google Scholar
  21. [21]
    B. Kakad, K. Jeeva, K.U. Nair and A. Bhattacharyya, Magnetic Activity Linked Generation of Night Time Equatorial Spread F Irregularities, J. Geophys. Res., 112 (2007) 1–11.CrossRefGoogle Scholar
  22. [22]
    B. Kakad, C.K. Nayak and A. Bhattacharyya, Power Spectral Characteristics of ESF Irregularities During Magnetically Quiet and Disturbed Days, J. Atmos. Sol-Terr. Phy., 8182 (2012) 41–49.CrossRefGoogle Scholar
  23. [23]
    R.P. Singh, R.P. Patel and A.K. Singh, Effect of Solar and Magnetic Activity on VHF Scintillations Near the Equatorial Anomaly Crest, Ann. Geophys., 22 (2004) 2849–2860.ADSCrossRefGoogle Scholar
  24. [24]
    N. Jyoti, C.V. Devasia, R. Sridharan and D. Tiwari, Threshold Height (h0F)c for the Meridional Wind to Play a Deterministic Role in the Bottom Side Equatorial Spread F and Its Dependence on Solar Activity, Geophys. Res. Lett., 31 (2004) 1–4.CrossRefGoogle Scholar

Copyright information

© Metrology Society of India 2016

Authors and Affiliations

  • G. A. Chavan
    • 1
  • A. K. Sharma
    • 1
  • O. B. Gurav
    • 1
  • H. P. Gaikwad
    • 1
  • D. P. Nade
    • 2
  • S. S. Nikte
    • 3
  • R. N. Ghodpage
    • 4
  • P. T. Patil
    • 4
  1. 1.Space and Earth Science Laboratory, Department of PhysicsShivaji UniversityKolhapurIndia
  2. 2.Department of Basic Sciences and Humanities, Sou Sushila Danchand Ghodawat Charitable Trust’sSanjay Ghodawat Group of InstitutionsAtigre, KolhapurIndia
  3. 3.Department of Basic Sciences and HumanitiesVishveshwarya Technical Campus Patgaon-MirajMirajIndia
  4. 4.Medium Frequency Radar, Indian Institute of GeomagnetismShivaji University CampusKolhapurIndia

Personalised recommendations