Tapasya Datta

Imagine a man standing on a rooftop in Calcutta at midnight. The city is asleep, but he is awake, watching an invisible pulse of energy bounce off the edge of the world & come back home. He was the 1st Indian to realize that the Void above us is actually a bridge. In 1935, while the British Raj dismissed Indian science as theoretical & primitive, a man in a quiet corner of Calcutta was aiming a radio beam at the heavens like a silver spear. He was not looking for God; he was looking for a mirror in the sky that everyone said did not exist & when he found it, he realized he had discovered the secret Electric Skin of the planet. Before Sisir Kumar Mitra, the world knew of the Ionosphere, but they thought it was a simple, single layer. Mitra was the 1st to prove the existence of the E-Layer & the complexity of the F-Layer specifically over the tropics. Using a primitive, hand-built radio transmitter, he sent signals upward & timed their return. He discovered that the air 100km above Calcutta was ringing like a bell. He proved that the Sun does not just give us light; it strips the air of its electrons, creating a celestial mirror. This is why we can hear a radio station from a 1000 KMs away at night. Mitra was the 1st man to map the Radio-Geography of the Indian sky. In the 1920s, the British were very protective of Broadcasting. They did not want Indians having the power to transmit information wirelessly. Sisir Kumar Mitra did not care. He set up the 1st amateur radio station in India at the University College of Science in Calcutta. He was essentially a pirate for science. He began broadcasting a call-sign that could be heard across the city, proving that an Indian could master the most advanced tech of the era. The British were furious but could not stop him because he was doing research. He paved the way for All India Radio using a rebel transmitter. In 1947, he published his magnum opus, The Upper Atmosphere. When the book arrived in the United States & the USSR, the scientists there were stunned. They thought a colonial scientist would only have outdated data. Instead, Mitra’s book was so advanced that it became the "Holy Book of Space Science" for the 1st decade of the Space Age. When the Soviets launched Sputnik in 1957, the engineers tracking its signal were using the atmospheric models created by a man in a humid room in Calcutta. The 1st satellite in space was talking through a sky that Sisir Kumar Mitra had already mapped. Near the end of his life, Mitra turned his eyes toward the Moon. He was one of the 1st to mathematically suggest that the Moon might have a plasma envelope/a very thin atmosphere of ions. For decades, this was dismissed. It was not until the Chandrayaan-1 mission & modern probes that the Lunar Ionosphere was confirmed. Mitra was right about the Moon half a century before India actually went there. Sisir Kumar Mitra was the man who turned the sky into a lab, proving that even under the weight of an Empire, an Indian mind could reach 300 kilometers straight up & touch the edge of space with nothing but a radio wave & a dream.