Papers by Malik Abdul Waheed
Geomagnetic field variations during five major Solar Energetic Particle (SEP) events of solar cyc... more Geomagnetic field variations during five major Solar Energetic Particle (SEP) events of solar cycle 23 have been investigated in the present study. The SEP events of have been selected to study the geomagnetic field variations at two highlatitude stations, Thule (77.5 • N, 69.2 • W) and Resolute Bay (74.4 • E, 94.5 • W) of the northern polar cap. We have used the GOES proton flux in seven different energy channels (4)(5)(6)(7)(8)(9)(9)(10)(11)(12)(13)(14)(15). All the proton events were associated with geoeffective or Earth directed CMEs that caused intense geomagnetic storms in response to geospace. We have taken high-latitude indices, AE and PC, under consideration and found fairly good correlation of these with the ground magnetic field records during the five proton events. The departures of the H component during the events were calculated from the quietest day of the month for each event and have been represented as H THL and H RES for Thule and Resolute Bay, respectively. The correspondence of spectral index, inferred from event integrated spectra, with ground magnetic signatures H THL and H RES along with Dst and PC indices have been brought out. From the correlation analysis we found a very strong correlation to exist between the geomagnetic field variation ( Hs) and high-latitude indices AE and PC. To find the association of geomagnetic storm intensity with proton flux characteristics we derived the correspondence between the spectral indices and geomagnetic field variations ( Hs) along with the Dst and AE index. We found a strong correlation (0.88) to exist between the spectral indices and Hs and also between spectral indices and AE and PC.
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Papers by Malik Abdul Waheed