Vol. 31 No. 1 (1992)
Articles

Nighttime F-region plasma structures observed by rocket-borne Langmuir and high frecuency capacitance probes from Natal, Brazil

Published 1992-01-01

Keywords

  • Langmuir probe,
  • high frequency capacitance probe,
  • ionosphere,
  • plasma bubble,
  • electron density irregularities,
  • F-region.
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  • Sondas de Langmuir,
  • sondas de capacitancia de alta frecuencia,
  • ionosfera,
  • burbuja de plasma,
  • irregularidades en la densidad electrónica,
  • región F.
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How to Cite

Muralikrishna, P., & Abdu, M. A. (1992). Nighttime F-region plasma structures observed by rocket-borne Langmuir and high frecuency capacitance probes from Natal, Brazil. Geofísica Internacional, 31(1), 59-63. https://doi.org/10.22201/igeof.00167169p.1992.31.1.1303

Abstract

Simultaneous in-situ measurements of electrons densities were made by rocket-borne Langmuir and High Frequency Capacitance probes from the equatorial station Natal in Brazil, using Brazilian SONDA III rockets. On both occasions, the rockets, carrying a swept voltage Langmuir probe and a dual frequency High Frequency Capacitance probe, in addition to other experiments, were launched into the nighttime ionosphere. During the first launch the rocket passed through developing plasma bubbles and during the second launch it passed through a practically bubbleless F-region. Electron density irregularities of vertical scale sizes ranging from a few kilometers to a large as 40 to 50 kilometers were observed by both probes. The general features of the large scale structures as observed by the two probes were similar, but there existed also considerable differences. For instance, the amplitudes of small scale structures in the F-region as observed at once of the HFC frequencies were generally large than those measured by the LP. Experimental factors as well as physical processes responsible for these differences are discussed.