If a major solar storm (solar flare) reaches the Earth, which of the following are the possible effects on the Earth? 1. GPS and navigation systems could fail. 2. Tsunamis could occur at equatorial regions. 3. Power grids could be damaged. 4. Intense auroras could occur over much of the Earth. 5. Forest fires could take place over much of the planet. 6. Orbits of the satellites could be disturbed. 7. Shortwave radio communication of the aircraft flying over polar regions could be interrupted. Select the correct answer using the code given below:

1. Statement 1: Solar storms can disrupt the Earth's ionosphere, which affects the propagation of radio signals used by GPS and navigation systems, potentially causing them to fail or become inaccurate. This is a possible effect. 2. Statement 2: Tsunamis are caused by geological events like underwater earthquakes or volcanic eruptions, not by solar storms. This is not a possible effect. 3. Statement 3: Geomagnetic storms induced by solar flares can create geomagnetically induced currents (GICs) in long conductors like power grids, potentially causing damage to transformers and leading to blackouts. This is a possible effect. 4. Statement 4: Solar storms increase the influx of charged particles into the Earth's magnetosphere, leading to more intense auroras (Northern and Southern Lights) that can be seen over wider areas than usual. This is a possible effect. 5. Statement 5: Solar storms do not directly cause forest fires. This is not a possible effect. 6. Statement 6: The increased energy from a solar storm can heat and expand the Earth's upper atmosphere, increasing atmospheric drag on low-orbit satellites and potentially disturbing their orbits. This is a possible effect. 7. Statement 7: Solar flares can cause radio blackouts, particularly affecting high-frequency (shortwave) radio communication used by aircraft, especially over polar regions where the Earth's magnetic field lines guide the solar particles. This is a possible effect. 8. Therefore, the possible effects are 1, 3, 4, 6, and 7.