I have tried to search through the internet about the definition of solar storm or what this term mean but i could found what it means. Also, what is the difference between the geomagnetic storm
I think "solar storm" is a term more likely to be used by a newspaper than a helioseismologist. As far as the term has any strict meaning, it means the same as the rather better defined term "geomagnetic storm". This is a disturbance to the Earth's magnetic field caused when charged particles from the sun hit the Earth's magnetic field. As usual, Wikipedia has an excellent article on this at http://en.wikipedia.org/wiki/Geomagnetic_storm. Incidentally, I note that if you search for "solar storm" on Wikipedia it redirects you to the "geomagnetic storm" article.