When we think about the Sun, it seems obvious that the closer you get to it, the hotter it must be. But in reality, the Sun plays a strange trick on science. Its outer layer known as the corona burns millions of degrees hotter than the surface below it. It’s a bit like wearing a jacket that’s somehow warmer than your body!
The mystery of the solar corona
The surface of the Sun, called the photosphere, has a temperature of about 5,500°C. That’s already blazing hot. But just above it lies the corona, a vast outer atmosphere stretching millions of kilometres into space, where temperatures can soar to over a million degrees Celsius.
For decades, scientists have wondered: How can the Sun’s outer layer be hundreds of times hotter than the surface beneath it? This question is known as the ‘coronal heating problem.’
What new research says
A recent study by researchers at the Indian Institute of Astrophysics (IIA) and other global space scientists has provided a clearer picture. Using data from advanced solar observatories, they found that tiny, constant magnetic explosions may be the reason behind this puzzling heat.
The Sun’s surface is covered with magnetic fields that twist and snap like rubber bands. When these magnetic lines suddenly break and reconnect a process called magnetic reconnection they release bursts of energy. These bursts travel upward into the corona, heating it much more than the surface.
Understanding it through an analogy
Think of it like this: the Sun’s surface is a pot of hot soup, but the steam rising from it is even hotter. That steam is the corona. The energy that shoots out of the magnetic fields acts like invisible flames heating that steam layer from within.
This discovery doesn’t just solve a long-standing space mystery, it helps scientists understand how solar energy moves through the universe. The corona is the region from which solar winds blow across the solar system. These winds can affect satellite communication, GPS systems, and even power grids on Earth.
By learning more about how the corona gets its heat, we can better predict solar storms and protect our technology here at home.
NASA and ISRO’s role
NASA’s Parker Solar Probe and the European Space Agency’s Solar Orbiter have both been flying closer to the Sun than ever before, collecting data about its magnetic behaviour. India’s Aditya-L1 mission, launched by ISRO, is also studying the corona and solar winds directly from space.
Together, these missions are helping scientists connect the dots between magnetic activity, energy transfer, and solar heating.
The bigger picture
Understanding the Sun is not just about curiosity. The Sun is our life source, giving Earth light, warmth, and the energy that drives our climate. But it’s also a powerful and unpredictable star whose behaviour can influence life on Earth in subtle ways.
The new findings bring us one step closer to grasping how stars like our Sun work. It reminds us that even the most familiar things in the sky still hold deep mysteries.
The idea that the Sun’s ‘jacket’ , its outer corona, is hotter than its ‘body’ might sound strange, but it’s one of nature’s most fascinating puzzles. Thanks to decades of scientific curiosity and new space missions, we’re finally beginning to understand why.
And as scientists continue to peel back the layers of our star, one thing becomes clear the Sun still has plenty of secrets left to shine on us.
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