Daytime gigahertz scintillations near magnetic equator: Relationship to blanketing sporadic e and gradient-drift instability

Aramesh Seif, Roland T. Tsunoda, Mardina Abdullah, Alina Marie Hasbi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Observations made in non-equatorial regions appear to support the hypothesis that the daytime scintillation of radio signals at gigahertz (GHz) frequencies is produced by the gradient-drift instability (GDI) in the presence of a blanketing sporadic E (Esb) layer. However, the only evidence offered, thus far, to validate this notion, has been some observations of Esb in the vicinity of GHz scintillations. A more comprehensive evaluation requires information about electric field, together with the presence of a steep gradient, which is presumed to be that of Esb. In this regard, the region in the vicinity of the equatorial electrojet (EEJ) appears to be an ideal "laboratory" to conduct such experiments. The dominant driver of electron drift there is the same as that of the EEJ, the vertical polarization electric field, and indications are that the presence of Esb in that vicinity is controlled by a balance in horizontal transport of Esb, between the EEJ electric field and the neutral wind, as described in a model by Tsunoda (On blanketing sporadic E and polarization effects near the equatorial electrojet, 2008). In this paper, we present, for the first time, results from a comprehensive study of daytime GHz scintillations near the magnetic equator. The properties, derived from measurements, are shown, for the first time, to be consistent with a scenario in which Esb presence is dictated by the Tsunoda model, and the plasma-density irregularities responsible for GHz scintillations appear to be produced by the GDI.

Original languageEnglish
Article number177
JournalEarth, Planets and Space
Volume67
Issue number1
DOIs
Publication statusPublished - 1 Dec 2015

Fingerprint

equatorial electrojet
magnetic equator
electrojet
daytime
scintillation
electric field
gradients
electric fields
polarization
sporadic E layer
radio signals
irregularities
plasma density
indication
radio
plasma
electron
evaluation
electrons
experiment

Keywords

  • Blanketing sporadic E (E)
  • Daytime GHz scintillation
  • Equatorial electrojet (EEJ)
  • Magnetic dip equator

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

Cite this

Daytime gigahertz scintillations near magnetic equator : Relationship to blanketing sporadic e and gradient-drift instability. / Seif, Aramesh; Tsunoda, Roland T.; Abdullah, Mardina; Hasbi, Alina Marie.

In: Earth, Planets and Space, Vol. 67, No. 1, 177, 01.12.2015.

Research output: Contribution to journalArticle

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