Proton
Nuclear Physics
One of the basic particles which makes up an atom. The proton is found in the nucleus and has a positive electrical charge equivalent to the negative charge of an electron and a mass similar to that of a neutron: a hydrogen nucleus.
- — Glossary of Nuclear Science Terms retrieved 2014-05-20
A stable, positively charged subatomic particle. Neutrons and protons form nearly the entire mass of atomic nuclei.
Cancer
A small, positively charged particle of matter found in the atoms of all elements. Streams of protons generated by special equipment can be used for radiation treatment.
Astronomy
A sub-atomic particle that has a positive electric charge. It is 1836 times more massive than an electron.
- — Space Weather Center Glossary of Space Weather-Related Terms retrieved 2014-05-26
Weather
Solar activity levels with at least one high energy event (Class X Flares).