The Sun and Space weather

Solar energy drives the space weather and affect earth enviriounments. the concept of space weather system was launched before decades to describe the short term variation in the different form of Solar activity. Space weather system affects the earth's atmosphere in many way's and through various phenomena,among them, geomagnetic stroms and variablity of glactic Cosmic rays flux belong to the most important one as for the lower atmosphere. Space weather refers to dynamic, Highly variable conditions in the geospace enviriounment including those on the Sun, in Interplanetary medium, and in the magnetosphere- Ionosphere-Thermosphere system.Adverse the performance and reliablity of both Spacecraft and ground based station system. this, in turn,can spell major losses due to communication and Navigation, power system, and reconnaissance satellite operation problems. thus space weather affect people and Society in many ways such as dissrupt in GPS and Radiowave propagation,radio occultation's.