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The reduced pressure in the interplanetary space in cycle 24 is compensated by a reduced magnetic /wikipediaĪlso read: Earth engulfed by a solar storm that could disrupt GPS "This was baffling to the scientists as, for them the reduced ambient pressure implied that CMEs were expanding into an interplanetary space to a significantly larger size, expectedly giving rise to large radial size.
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Scientists led by Dr Wageesh Mishra of the Indian Institute of Astrophysics (IIA), Bengaluru, an autonomous institute under the Centre's Department of Science & Technology, have shown that the average radial size of CMEs in the last decades (during solar cycle 24 from 2008-2019) is only two-thirds of its value in the previous cycle. It had earlier been traced that Cycle 24 (2008-2019) was weaker than Cycle 23 (1996-2007), and the Sun was weakest in 2019 during the last 100 years. Intensity of such solar activity is known to vary in 11-year long periodic cycles. They affect the near-Earth space environment disturbing the orbit of satellites in low-earth orbits, Global Positioning Signals (GPS), long-distance radio communications, and power grids. Understanding such activity of the Sun, particularly the propagation of CMEs, is important since they cause major perturbations in the Earth's magnetosphere. The Sun is known to be very active with sunspots, solar flares, and CMEs - episodic expulsion of huge magnetised plasma from the Sun out into space. Surprisingly, this was also accompanied with decrease in the average radial size of CMEs - contrary to the expectation that decrease of pressure in the interplanetary medium will be accompanied with increase in radial size of CMEs.
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The Sun was the weakest in 2019 during the last 100 years and there has been a significant decrease in the mass, size as well as internal pressure of explosive phenomena, a study published in the Frontiers in Astronomy and Space Sciences journal said.įollow NewsGram on Facebook to stay updated. The Sun, an explosive celestial object, has been much quieter between 20 than it was between 19, and scientists have quantified that radial size of its Coronal Mass Ejections (CMEs) are two-thirds the radial size of CMEs in the last decade.