1. Positive Charges:
- The upper part of the cloud, known as the anvil or cirrus section, accumulates a significant concentration of positive charges.
- These positive charges are primarily carried by ice particles that are formed at high altitudes within the cloud.
- The upward movement of ice particles due to strong updrafts separates them from the more massive, negatively charged graupel and hail particles.
2. Negative Charges:
- The lower portion of the cloud, particularly the central and lower negative charge centers, contains an abundance of negative charges.
- These negative charges are mainly associated with graupel, small hail, and supercooled water droplets.
- The collision and interaction between these particles through various processes, such as graupel-to-graupel collisions and the splintering of ice, lead to charge separation.
The separation of positive and negative charges within a cumulonimbus cloud creates an electrical potential difference, with the upper positive region and the lower negative region acting as giant capacitor plates. As charge separation intensifies, the electric field strength increases, eventually reaching a point where the air can no longer withstand the voltage, leading to a lightning discharge.
Lightning occurs when a channel of highly ionized, superheated air forms between regions of opposite charges within the cloud or between the cloud and the ground. The electrical breakdown releases a tremendous amount of energy in the form of light, heat, and sound, resulting in lightning flashes and thunderclaps.
It's important to note that the charge distribution in cumulonimbus clouds is dynamic and constantly evolving throughout the thunderstorm's lifecycle. The interplay of updrafts, downdrafts, and particle collisions influences the charge separation processes and can result in complex charge structures within the cloud.
