Surname: Abdu
First Name: Mangalathayil A.
Status= other
Institution: Instituto Nacional de Pesquisas Espaciais - INPE
E-mail: maabdu@julian.uwo.ca
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Title: 
Equatorial electrojet irregularities investigations using a 50 MHz 
back-scatter radar and a digisonde: some initial results 

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Authors: 
M. A. Abdu, C. M. Denardini, J. H. A. Sobral, I. S. Batista, 
P. Muralikrishna, R. R. de Paula
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Abstract: 
A new 50 MHz coherent back-scatter radar has recently become operational 
at the Eqautorial Space Obsevatory of INPE at São Luis (2.33° S, 44.2°W,
dip: -0.5°), in Brazil. Preliminary results from a 10-day campaign in 
December 1999 involving this radar and a digissonde are presented in this 
paper.The RTI maps of electrojet irregularities show short period (~5 minutes 
or larger)fluctuations and significant day-to-day variabilities. A notable 
chatacteristics is the midday descent in the altitude of the RTI pattern 
that resembles the duirnal pattern of the base hight of the q-type sporadic 
E layer observed by the digisonde and that of the of the well known 150 km 
echoes observed over 
Jicamarca  and Pompei. 

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Discipline Category: Ionosphere