Letter | Published:

Anomalous Dielectric Constant of Artificial Ionosphere

Nature volume 140, pages 586587 (02 October 1937) | Download Citation

Subjects

Abstract

SINCE the earliest experiments of Barton and Kilby1 in 1913 on the dielectric properties of ionized air, there have been many attempts by investigators to record experimentally the depression of the dielectric constant of an artificial ionosphere (as the ionized air in a discharge tube may more properly be called) to a value less than unity. It has, however, been found by almost every investigator that the reduced value of the dielectric constant could be obtained only under very special experimental conditions such as low value of ionization in the experimental discharge tube or ultra-high frequency of the exciting wave ; while, more often than not, the value of the dielectric constant recordeol was greater than unity. This latter result is usually believed to be contradictory to the theory, and various explanations have been put forward to explain the apparent anomaly.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

References

  1. 1.

    , and , Phil. Mag., 26, 567 (1913).

  2. 2.

    , “Electro-magnetic Waves” (Methuen and Co., 1934), p. 58.

  3. 3.

    , and , Proc. Phys. Soc., 44, 253 (1932). (The remark quoted is for the case of no external magnetic field.)

  4. 4.

    , and , NATURE, 136, 512 (1935).

Download references

Author information

Affiliations

  1. University College of Science, 92 Upper Circular Road, Calcutta. Aug. 16.

    • S. K. MITRA
    •  & K. K. ROY

Authors

  1. Search for S. K. MITRA in:

  2. Search for K. K. ROY in:

About this article

Publication history

Published

DOI

https://doi.org/10.1038/140586b0

Comments

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.