![]() ![]() Yet the solar corona remains heated to over a million degrees even when the Sun is silent. Over the past few years, the Sun has been at the quiet end of its cycle, displaying little or no surface activity. The Sun’s magnetism holds the key to solving a well-known mystery: what makes the temperature of its outermost atmosphere, or the corona several hundred times hotter than its surface? When the Sun is not silent, we can observe and measure magnetic forces at work that produce sunspots, giant solar flares, and coronal mass ejections – fiery processes that can inject heat into the corona. It has been difficult to measure the magnetic strength when the Sun goes silent – until now. The Solar Cycle sees our Sun alternate between phases of tempest and tranquility driven by its magnetic field roughly every 11 years. Status: Published in the Astrophysical Journal Letters Ruiz Coboįirst Author’s Institution: Instituto de Astrofísica de Canarias (IAC),Vía Láctea s/n, E-38205 San Cristóbal de La Laguna, Tenerife, Spain Title: Mapping the Hidden Magnetic Field of the Quiet SunĪuthors: J. ![]()
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