The prereversal enhancement in the vertical drift for Fortaleza and the sporadic E layer
Using ionogram-recorded data for the location of Fortaleza ( 3 . 8 ∘ S, 38 . 0 ∘ W; magnetic latitude = - 6 ∘ ), the relation between the evening prereversal enhancement in the vertical F region plasma drift ( E × B ) and the diurnal variation of the sporadic E layer ( Es ) is examined. The database...
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Published in | Journal of atmospheric and solar-terrestrial physics Vol. 67; no. 16; pp. 1610 - 1617 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Oxford
Elsevier Ltd
01.11.2005
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | Using ionogram-recorded data for the location of Fortaleza (
3
.
8
∘
S,
38
.
0
∘
W; magnetic latitude
=
-
6
∘
), the relation between the evening prereversal enhancement in the vertical
F region plasma drift
(
E
×
B
)
and the diurnal variation of the sporadic
E layer
(
Es
)
is examined. The database examined corresponds to the period of June 2001. The
F region vertical drifts obtained as
dh
′
F
/
dt
for quiet days reveal that when the amplitudes of the evening prereversal enhancement (PRE) are higher, an interruption of an ongoing sporadic
E layer is observed. A recent investigation by Abdu et al. [2003. Journal of Geophysical Research 108(A6), 1254. doi: 10.1029/2002JA009285.], showed that an upward electric field, intensified during the PRE, can be responsible for the inhibition of the sporadic
E layer. In this work, we investigate the possible influence of a modified conductivity on the PRE development. The model developed by Batista et al. [1986. Journal of Geophysical Research 91(A11), 12055–12064.], based on the work of Heelis et al. [1974. Planetary and Space Science 22, 743–756.], was used to test the response of the PRE (its amplitude, time of occurrence and time of inversion) when the electrical conductivity of the
E region is modified, specifically around sunset. The real cause of this modified conductivity is not investigated here, but the presence of a sporadic
E layer could partially contribute to that. The causes of the agreement or disagreement between the computed and the observed value of vertical drift are discussed. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 ObjectType-Article-2 ObjectType-Feature-1 |
ISSN: | 1364-6826 1879-1824 |
DOI: | 10.1016/j.jastp.2005.07.015 |