@Article{AbduMediSobrBitt:1983:SpPlBu,
author = "Abdu, Mangalathayil Ali and Mediros, Rui Tertuliano and Sobral,
Jos{\'e} Humberto Andrade and Bittencourt, Jos{\'e} Augusto",
title = "Spread F plasma bubble vertical rise velocities determined from
spaced ionosonde observations",
journal = "Journal of Geophysical Research",
year = "1983",
volume = "88",
number = "A11",
pages = "000",
month = "Nov.",
keywords = "AERONOMIA, ionosonda, sondas ionosf{\'e}ricas, bolhas de plasma,
propaga{\c{c}}{\~a}o F, densidade dp plasma, ionosonds, plasma
bubbles, spread F, plasma density.",
abstract = "Systematic time differences in the onsets of spread F events in
the ionograms are observed between the magnetic equatorial station
Fortaleza (4 degree S, 38 degree W, dip latitude 1.8 degree S)and
the low-latitude station Cachoeira Paulista (23 degree S, 45
degree W, dip latitude 14 degree S), two stations in Brazil,
located at close-by magnetic meridional planes (actually some 12
degree of magnetic longitude apart). On the assumption, justified
from different experimental observations, that the spread F
irregularities occur in strongly field-aligned plasma bubbles that
extend several degrees on either side of the magnetic equator, and
rise up in vertically elongated columns over the magnetic equator,
we have related the observed time differences in the onsets of
spread F events at the two stations to the plasma bubble vertical
rise velocities over the magnetic equator. The vertical rise
velocities of the plasma bubble so determined are found to be well
within the values measured by VHF radar and satellite techniques,
and further show, at times, good correlations with the amplitude
of the prereversal peak in the vertical drift velocities and the
heights of the evening equatorial F layer. Possible implications
of these results are discussed.",
issn = "0148-0227 and 2156-2202",
label = "2258",
targetfile = "INPE-2416.pdf",
urlaccessdate = "05 maio 2024"
}