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Changes in the three components ofgeomagnetic field are reported at the chain of ten geomagnetic observatories inIndia during an intense solar crochet that occurred at 1311 h 75° EMT on 15June 1991 and the subsequent sudden commencement (SSC) of geomagnetic storm at1518 h on 17 June 1991. The solar flare effects (SFE) registered on themagnetograms appear to be an augmentation of the ionospheric current systemexisting at the start time of the flare. An equatorial enhancement inΔH due to SFE is observed to be similar in nature to thelatitudinal variation of SQ (H) at low latitude. ΔYregistered the largest effect at 3.6° dip latitude at the fringe region of theelectrojet. ΔZ had positive amplitudes at the equatorialstations and negative at stations north of Hyderabad. The SSC amplitude in the Hcomponent is fairly constant with latitude, whereas the Z component againshowed larger positive excursions at stations within the electrojet belt. Theseresults are discussed in terms of possible currents of internal and externalorigin. The changes in the Y field strongly support the idea thatmeridional current at an equatorial electrojet station flows in the ionosphericdynamo, E

annales geophysicae

An intense SFE and SSC event in geomagnetic &amp;lt;i&amp;gt;H&amp;lt;/i&amp;gt;, &amp;lt;i&amp;gt;Y&amp;lt;/i&amp;gt; and &amp;lt;i&amp;gt;Z&amp;lt;/i&amp;gt; fields at the Indian chain of observatories