Space Weather and Solar-Terrestrial Physics

What a solar storm actually is

A solar storm originates from disturbances on the Sun's surface, most significantly solar flares (sudden, intense bursts of radiation) and Coronal Mass Ejections (CMEs), enormous eruptions of magnetised plasma flung outward from the Sun's corona. When a CME's material and magnetic field reach Earth, they interact with Earth's own magnetic field, and that interaction is what produces the range of effects grouped together as space weather.

The real effects, and the invented one a question is testing for

A past question tested exactly this list, mixing genuine effects with a plausible-sounding but physically impossible one, which is the format worth being ready for.

Genuinely real effects: disruption of GPS and satellite navigation signals, since the charged particles disturb the ionosphere the signals travel through; damage to satellites themselves, from both radiation and unexpected atmospheric drag as the upper atmosphere heats and expands; and damage to electrical power grids, since the geomagnetic disturbance can induce unwanted currents in long transmission lines, a risk serious enough that grid operators genuinely plan for it.

Not a real effect: tsunamis. A tsunami is caused by a sudden, large-scale displacement of ocean water, overwhelmingly from undersea earthquakes, volcanic eruptions, or landslides, all of which are mechanical, geological events. A solar storm's effects are electromagnetic and radiative; it has no physical mechanism for displacing ocean water at all, at any location, coastal or otherwise. Any option pairing "solar storm" with "tsunami" is testing whether you can tell a plausible-sounding invented effect from the genuinely documented ones.

Earth's own magnetic field: the connection to rock magnetism

A separate, related fact links space weather to geology rather than to technology. Earth's magnetic field has genuinely shifted, and even reversed polarity entirely, over geological timescales, and this history is recorded in rock magnetism: when certain molten rock cools and solidifies, magnetic minerals within it lock in, permanently, the direction of Earth's magnetic field at that exact moment. Reading that record across many rock layers of known age is how scientists reconstruct the history of Earth's magnetic field, entirely independent of any single solar storm event, though both facts sit under the broader heading of Earth's magnetism and its interaction with space.

Quick revision points

• Solar flares (radiation bursts) and Coronal Mass Ejections (plasma eruptions from the Sun's corona) are what drive space weather when they reach Earth and interact with its magnetic field.
• Real effects: disrupted GPS/satellite navigation (ionospheric disturbance), satellite damage (radiation and increased atmospheric drag), power grid disruption (induced currents in transmission lines).
• Not a real effect: tsunamis, which require mechanical displacement of ocean water (earthquakes, volcanic eruptions, landslides) that a solar storm has no mechanism to cause. This pairing is the standard invented-option trap.
• Rock magnetism independently records shifts and reversals in Earth's magnetic field over geological time, locked in when molten rock cooled; this is a separate fact from any single solar storm event, both falling under Earth's magnetism broadly.