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Hemispheric Asymmetry in Transition from Equatorial Plasma Bubble to Blob as Deduced from 630.0 nm Airglow Observations at Low LatitudesTransitions from depletions to enhancements of 630.0 nm nighttime airglow have been observed at Arecibo. Numerical simulations by Krall et al. (2009) predicted that they should occur only in one hemisphere, which has not yet been confirmed observationally. In this study we investigate the hemispheric conjugacy of the depletion-to-enhancement transition using multiple instruments. We focus on one event observed in the American longitude sector on 22 December 2014: 630.0 nm airglow depletions evolved into enhancements in the Northern Hemisphere while the evolution did not occur in the conjugate location in the Southern Hemisphere. Concurrent plasma density measured by low Earth orbit (LEO) satellites and 777.4 nm airglow images support that the depletions and enhancements of 630.0 nm night time airglow reflect plasma density decreases and increases (blobs), respectively. Characteristics of the airglow depletions, in the context of the LEO satellite data, further suggest that the plasma density depletion deduced from the airglow data represents equatorial plasma bubbles (EPBs) rather than medium-scale traveling ionospheric disturbances from midlatitudes. Hence, the event in this study can be interpreted as EPB-to-blob transition.
Document ID
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Park, Jaeheung
(Institute of Space Science and Astronomy Daejon, Korea, Republic of)
Martinis, Carlos R.
(Boston Univ. Boston, MA, United States)
Luehr, Hermann
(GFZ German Research Centre for Geosciences Potsdam, Germany)
Pfaff, Robert F.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Kwak, Young-Sil
(Institute of Space Science and Astronomy Daejon, Korea, Republic of)
Date Acquired
April 6, 2017
Publication Date
January 30, 2016
Publication Information
Publication: Journal of Geophysical Research: Space Physics
Publisher: AGU
Volume: 121
Issue: 1
ISSN: 2169-9380
e-ISSN: 2169-9402
Subject Category
Space Sciences (General)
Report/Patent Number
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