Long-term data can be used to establish the past record of natural hazard event occurrences, with an eye toward the future. Climate Observation Data. Historical climate observations may include those from land, ocean, and atmosphere.
Original data come from many sources-from handwritten log books to satellite output in digital form.
Many of these collections are now online. Geomagnetic storms develop when masses of highly energetic, charged particles are ejected from the Sun and, subsequently, hit Earth's magnetic field. These events may be severe enough to upset delicate technological systems on satellites and on the ground, causing interruption of communications and electric power. Data are available for study of this unusual natural hazard. Historical Oceanographic Profile Data.