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Periodicity in the occurrence of equatorial plasma bubbles derived from the C/NOFS observations in 2008–2012
Author(s) -
Choi JongMin,
Kil Hyosub,
Kwak YoungSil,
Park Jaeheung,
Lee Woo Kyoung,
Kim Yong Ha
Publication year - 2017
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2016ja023528
Subject(s) - bubble , longitude , langmuir probe , plasma , satellite , seeding , geology , physics , geophysics , mechanics , astrophysics , geodesy , latitude , plasma diagnostics , astronomy , quantum mechanics , thermodynamics
The quasi‐periodic occurrence of equatorial plasma bubbles is understood in terms of seeding mechanisms in the bottomside F region. However, no quantitative investigation has been conducted to identify how often quasi‐periodic bubbles occur. This study investigates the wave property in the bubble occurrence (or spacing between bubbles) using the measurements of the plasma density in 2008–2012 by the Planar Langmuir Probe on board the Communication/Navigation Outage Forecasting System (C/NOFS) satellite. The wave property is investigated using the Lomb‐Scargle periodograms derived from 664 segments of series of bubbles. In the majority of segments, the spacing between bubbles is represented by the combination of several wave components. Periodic bubbles whose property is represented by a few pronounced wave components are rare events. These results indicate that the spacing between bubbles is generally irregular. The manner of bubble occurrence does not show any notable variation with longitude and season. Because a consistent wave property does not exist in the occurrence of bubbles and the appearance of bubbles in the topside is affected by many factors, the manner of bubble occurrence in satellite observations does not provide a precise diagnostic of seeding mechanisms.