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|Title:||Day-to-day Variability in Ionospheric Drifts at Tiruchirapalli in relation to Electrojet Strength|
Vyas, G D
Rastogi, R G
|Abstract:||East-west drift motion of ionospheric E and F-region irregularities over Tiruchirapalli (dip 4'8°N) during the period 1973-74 has been compared with various definitions of the electrojet strength as determined from ground magnetograms. These include the range in H at an equatorial station like Trivandrum (ΔHT) or Kodaikanal (ΔHk), the difference between the ranges at an equatorial station and at a station away from equator such as Alibag (ΔHT–ΔHA or – ΔHK– ΔHA) and ΔSdI which is defined as ΔSdI = ΔHT – ΔHA +ΔHA (ΔHA being the average quiet day Sq-range) High correlations are obtained between the E-W component of drift and various electrojet parameters the correlation being higher for ΔHT–ΔHA or – ΔHK- ΔHA and ΔSdI Linear relationship is noted exception the morning hours (0800-1000 hrs LT) for E-region, with drift speed being constant (about 150 m/sec) at higher ranges of the electrojet strength. Another interesting feature noted is that the electrojet strength is positive when drift speed is zero, indicating simultaneous opposite drift velocities at different altitudes in the dynamo region.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.08(4) [August 1979]|
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