Geomagnetic induced current (GIC) is a ground end manifestation associated with the space weather perturbations that should be greatly taken into account by the society. Although the GICs implication to the power system is not regular, it can cause large scale of system failure. In equatorial, the power system is considered safe since the most intense of geomagnetic storm happened in high latitude. However, the internal damage due to GICs which finally led to the South African power system failure has totally changed the normal perception. Therefore, a preliminary investigation on the GICs activity in equatorial region is performed to understand the space weather impact to the power system. Time derivative of the horizontal magnetic field component (dB/dt) is done to indicate the GICs activity value based on Faraday’s law. All the reported power failures are compiled to produce the threshold value of dB/dt, which possibly cause the harmful effect to the system. Then, dB/dt analysis is extended to show the pattern of GICs activity in function of magnetic latitude and local time. The results reveal that power network in equatorial region has possibly suffered by GIC. Plus, high number of intense GIC activity in this region occurred during dayside.

The power subsystem could possibly be the most underappreciated and forgotten of all of the on-board electrical subsystems. There may be several reasons for this, but the most likely is that most people just don't find the subject interesting enough. There are, of course, exceptions to this generalization, but it is safe to say that no one is currently planning a mission to demonstrate optimization of power system network. Grabbing the attention of spacecraft engineers are subjects like; more advanced communications systems, on-board data handling, and high speed data links, imaging systems, micro-propulsion, attitude control algorithms, sensors and actuators. It is natural that the best people in a small organization focus on the more exciting aspects of a mission; these subjects will typically be the differentiator of an organization's space mission from that of the rest of the world. However, it is also clear that these systems need power, and power that is delivered reliably and efficiently. For most companies and organizations planning their own microsatellite mission, the prospect of producing a reliable, yet affordable power system for their mission is not a trivial problem. Some non-traditional spacecraft manufacturers, such as Universities, are finding out the importance of a well-designed power system the hard way. The most common cause of failure on microsatellite mission to date has been the power system. As all microsatellite missions require some sort of optimization of power system network, and since this system will differ little from mission to mission, it makes sense to provide an off-the-shelf solution for common buses. By providing such a system, the responsibility of design of the power system within smaller organizations can be removed, allowing the mission design team to focus on the design of the rest of the spacecraft.