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Field aligned observations of transequatorial bubbles from Rarotonga in 1969‐70
Author(s) -
Malcolm R.,
Miles C.,
Tinsley B. A.
Publication year - 1984
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl011i007p00665
Subject(s) - geology , photometer , diffusion , geophysics , raster scan , physics , optics , thermodynamics
A raster scanning photometer with 0.5° field of view was used in 1969‐70 to make images in 6300 Å and 5577 Å emission from Rarotonga of tropical F region trans‐equatorial ‘bubbles’ or ‘depletions.’ From this site the F region plasma structures in the emission layer can be viewed in a magnetic field aligned configuration. A spatial resolution of approximately 15 km was achieved, and revealed a variety of shapes in the bubble cross sections, including ‘bifurcations’ and ‘pinched off’ bubbles. Eastward drift velocities averaged 125 ms −1 . Tilts were usually westward at about 45° in the equatorial plane, but some were near zero and some were eastward. The tops reached apex heights of over 800 km. The structures appeared a little less diffuse in 5577 Å emission than in 6300 Å owing to less diffusion of O¹S with its 0.75 sec. lifetime, than O¹D with its 150 sec. lifetime.