Low Latitude Plasma Blobs: A Review

  • Kim, Vitaly P. ;
  • Hegai, Valery V.
  • Received : 2015.12.22
  • Accepted : 2015.01.28
  • Published : 2016.03.15


In recent years, there has been renewed activity in the study of local plasma density enhancements in the low latitude F region ionosphere (low latitude plasma blobs). Satellite, all-sky airglow imager, and radar measurements have identified the characteristics of these blobs, and their coupling to Equatorial Plasma Bubbles (EPBs). New information related to blobs has also been obtained from the Communication/Navigation Outage Forecasting System (C/NOFS) satellite. In this paper, we briefly review experimental, theoretical and modeling studies related to low latitude plasma blobs.


plasma blobs;low latitude ionosphere;equatorial plasma bubbles


  1. Yokoyama T, Su SY, Fukao S, Plasma blobs and irregularities concurrently observed by ROCSAT-1 and Equatorial Atmosphere Radar, J. Geophys. Res. 112, A05311 (2007).
  2. Oya H, Takahashi T, Watanabe S, Observation of Low Latitude Ionosphere by the Impedance Probe on Board the Hinotori Satellite, J. Geomagn. Geoelectr. 38, 111–123 (1986).
  3. Park J, Min KW, Lee JJ, Kil H, Kim VP, et al., Plasma blob events observed by KOMPSAT-1 and DMSP F15 in the low latitude nighttime upper ionosphere, Geophys. Rev. Lett. 30, 2114 (2003).
  4. Park J, Min KW, Kim VP, Kil H, Kim HJ, et al., Statistical description of low-latitude plasma blobs as observed by DMSP F15 and KOMPSAT-1, Adv. Space Res. 41, 650–654 (2008a).
  5. Watanabe S, Oya H, Occurrence Characteristics of Low Latitude Ionosphere Irregularities Observed by Impedance Probe on Board the Hinotori Satellite, J. Geomagn. Geoelectr. 38, 125–149 (1986).
  6. Park J, Stolle C, Lühr H, Rother M, Su SY, et al., Magnetic signatures and conjugate features of low-latitude plasma blobs as observed by the CHAMP satellite, J. Geophys. Res. 113, A09313 (2008b).
  7. Pimenta AA, Sahai Y, Bittencourt JA, Abdu MA, Takahashi H, et al., Plasma blobs observed by ground-based optical and radio techniques in the Brazilian tropical sector, Geophys. Rev. Lett. 31, L12810 (2004).
  8. Pimenta AA, Sahai Y, Bittencourt JA, Rich FJ, Ionospheric plasma blobs observed by OI 630 nm all-sky imaging in the Brazilian tropical sector during the major geomagnetic storm of April 6–7, 2000, Geophys. Rev. Lett. 34, L02820 (2007).
  9. Woodman RF, Spread F – an old equatorial aeronomy problem finally resolved?, Ann. Geophys. 27, 1915–1934 (2009).
  10. Kil H, Choi HS, Heelis RA, Paxton LJ, Coley WR, et al., Onset conditions of bubbles and blobs: A case study on 2 March 2009, Geophys. Rev. Lett. 38, L06101 (2011).
  11. Kil H, Kwak YS, Lee WK, Miller ES, Oh SJ, et al., The causal relationship between plasma bubbles and blobs in the low-latitude F region during a solar minimum, J. Geophys. Res. 120, 3961–3969 (2015).
  12. Klenzing JH, Rowland DE, Pfaff RF, Le G, Freudenreich H, et al., Observations of low-latitude plasma density enhancements and their associated plasma drifts, J. Geophys. Res. 116, A09324 (2011).
  13. Martinis C, Baumgardner J, Mendillo M, Su SY, Aponte N, Brightening of 630.0 nm equatorial spread-F airglow depletions, J. Geophys. Res. 114, A06318 (2009).
  14. Krall J, Huba JD, Martinis CR, Three-dimensional modeling of equatorial spread F airglow enhancements, Geophys. Rev. Lett. 36, L10103 (2009).
  15. Krall J, Huba JD, Joyce G, Yokoyama T, Density enhancements associated with equatorial spread F, Ann. Geophys. 28, 327–337 (2010).
  16. Le G, Huang CS, Pfaff RF, Su SY, Yeh HC, et al., Plasma density enhancements associated with equatorial spread F: ROCSAT-1 and DMSP observations, J. Geophys. Res. 108, 1318 (2003).
  17. Miller ES, Kil H, Makela JJ, Heelis RA, Talaat ER, et al., Topside signature of medium-scale traveling ionospheric disturbances, Ann. Geophys. 32, 959–965 (2014).
  18. Choi HS, Kil H, Kwak YS, Park YD, Cho KS, Comparison of the bubble and blob distributions during the solar minimum, J. Geophys. Res. 117, A04314 (2012).
  19. Dashora N, Pandey R, Observations in equatorial anomaly region of total electron content enhancements and depletions, Ann. Geophys. 23, 2449–2456 (2005).
  20. de La Beaujardière O, the C/NOFS Science Definition Team, C/NOFS: a mission to forecast scintillations, J. Atmos. Sol.-Terr. Phys. 66, 1573–1591 (2004).
  21. Haaser RA, Earle GD, Heelis RA, Klenzing J, Stoneback R, et al., Characteristics of low-latitude ionospheric depletions and enhancements during solar minimum, J. Geophys. Res. 117, A10305 (2012).
  22. Kelley MC, Makela JJ, de La Beaujardière O, Retterer J, Convective ionospheric storms: A review, Rev. Geophys. 49, RG2003 (2011).
  23. Hanson WB, Moffett RJ, Ionization Transport Effects in the Equatorial F Region, J. Geophys. Res. 71, 5559–5572 (1966).
  24. Huang CS, Le G, de La Beaujardière O, Roddy PA, Hunton DE, et al., Relationship between plasma bubbles and density enhancements: Observations and interpretation, J. Geophys. Res. 119, 1325–1336 (2014).
  25. Huba JD, Krall J, Joyce G, Atomic and molecular ion dynamics during equatorial spread F, Geophys. Res. Lett., 36, L10106 (2009). http://10.1029/2009GL037675
  26. Kil H, The Morphology of Equatorial Plasma Bubbles – a review, J. Astron. Space Sci. 32, 13–19 (2015).
  27. Anderson DN, Haerendel G, The motion of depleted plasma regions in the equatorial ionosphere. J. Geophys. Res. 84, 9A0050 (1979).