A total of 374 large magnetic storms (Kp/K>=5) occurring at Karachi during the solar cycle (1989-2000) have been studied. This study discusses a seasonal and annual frequency of occurrence of these magnetic storms. During magnetic storm, the most conspicuous effects noted are lowering of the critical frequency of F2 layer(foF2) and increase in absorption, due to which the range of usable frequencies is narrowed. |
Abstracts 
