The paper examines the Ionospheric response to
the annular eclipse of the sun on January 15, 2010 over eastern
and western Malaysia using GPS data measurement from 14-
ground station in Malaysia. The GPS sensing technique employs
two different approaches to verify the TEC depletion occurrence
at the 14-stations. The first approach measures the TEC
depletion parameters at the 14 GPS stations during the solar
event. The second approach compares the TEC value with the
quiet day TEC variation at one of the station 3-days before and
3-days after the solar eclipse event. The GPS observation
indicates occurrence of TEC depression at 6 stations where the
behaviour varying from one station to another. On the basis of
the first and second measurement techniques, the range of TEC
depletions at the six stations were 9 to 20 %, while for the other
8-stations 0.4 to 12% respectively. The measurement shows that
TEC depression at most GPS stations began on the neck of the
first contact of the solar eclipse followed by deeper depressions.
This effect was as a result of the hiding of the optical rays during
the solar eclipse which causes direct reduction in photo
ionization; destroy the previous photo-chemical equilibrium and
result in the depletion in electron density
