Final answer:
Auroras in the upper atmosphere are stimulated by charged particles emitted by the Sun and are primarily seen in the magnetic polar regions.
Step-by-step explanation:
The statement - Auroras in the upper atmosphere are stimulated by streams of charged (ionized) particles emitted by the Sun - is True.
When charged particles from the solar wind reach the Earth's magnetosphere, they follow the magnetic field lines towards the North and South poles. As these particles collide with molecules in the Earth's atmosphere, they cause them to emit light and produce the beautiful curtains of light known as auroras or northern and southern lights.
The auroras are primarily seen in the magnetic polar regions and are a result of the interaction between the charged particles from the Sun and Earth's magnetic field.