Letter | Published:

Infrasonic Waves of the Auroral Zone

Naturevolume 207pages848849 (1965) | Download Citation



INFRASONIC waves of the auroral zone have been observed1,2 using a suitable microphone system. These waves are thought to originate in the joule heating by the electrojet currents1 or in the corpuscular heating during ionization and excitation processes2 in the auroral ionosphere—at about the 100-km level. Periodic influx of electrons at this level due to processes, which may be solar, magnetospheric or extra-magnetospheric, could cause periodic fluctuations in the current systems and the heating processes; hence the observed periods (in the range 20–80 sec and, at times, upwards of 100 sec). Time-scales of this order are known in auroral pulsations. It is suggested here that it is also possible to account for the energy fluctuations from the atmospheric dynamics, specifically turbulence near 100 km, which can generate these waves via the pressure fluctuations.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    Campbell, W. H., and Young, J. M., J. Geophys. Res., 68, 5909 (1963).

  2. 2

    Maeda, K., and Watanabe, T., J. Atmos. Sci., 21, 15 (1964).

  3. 3

    Iyengar, R. S., Phys. Letters, 13, 297 (1964).

  4. 4

    Iyengar, R. S., Phys. Letters, 15, 135 (1965).

  5. 5

    Iyengar, R. S., Nature, 195, 792 (1962).

  6. 6

    Omholt, A., Planet. Space Sci., 9, 285 (1962).

  7. 7

    Davies, T. N., and Hicks, G. T., J. Geophys. Res., 69, 1931 (1964).

  8. 8

    Blamont, J. E., Planet. Space Sci., 10, 89 (1963).

  9. 9

    Campbell, W. H., and Rees, M. H., J. Geophys. Res., 66, 41 (1961).

  10. 10

    Iyengar, R. S., and Shepherd, G. G., Canad. J. Phys., 39, 1911 (1961).

Download references

Author information


  1. Mount Allison University, Sackville, New Brunswick, Canada

    • R. S. IYENGAR


  1. Search for R. S. IYENGAR in:

About this article

Publication history

Issue Date



Further reading


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.