Mysterious Eruptions on Venus A Result Of Massive Solar Activity
By on March 6th, 2012

Strange things are afoot on Venus and we’ve got just a hint as to what they are. Gigantic explosions have been seen on the surface of Venus, possibly triggered by the intense Solar winds, which peaked yesterday. The spectacular explosions occur just above the surface of the planet, since Venus lacks a proper magnetosphere.

How the magnetosphere of a planet shields it from a solar wind. Venus doesn't have a strong enough magnetic field.

Scientists call these Hot Flow Anomalies (HFA’s) and these are common on Saturn. They have also been seen on Mars, but this is the first time such gigantic explosions are afoot on Venus.

An Explanation

Here’s a quick explanation as to why these HFA’s actually happen. The Sun sends out millions of charged particles travelling at very high speeds towards the planet. There are often discontinuities in the solar wind, and this is recorded as a sharp change in the magnetic field of the solar winds.

HFA's on Venus. The charged particles get swept up by this moving front of weak magnetic field. (Image Courtesy: GSFC/Collinson paper)

If these areas lie parallel to the direction of wind flow, the wind can remain in contact with the contour along which the solar wind slows down and changes direction, called the bow shock (marked). If the propagation of the discontinuity is slow enough, it sweeps up enough charged particles. These charged particles form plasma, which sends shockwaves resulting in these gigantic eruptions.

Huge Energy reservoirs

This process happens on Earth too, but the strong magnetic field of the Earth prevents the process from occurring too close to the surface. These processes release a lot of energy. About the HFAs on Venus, David Sibeck, a planetary climate scientist at NASA’s Goddard Space Flight Center says:

Hot flow anomalies release so much energy that the solar wind is deflected, and can even move back toward the sun. That’s a lot of energy when you consider that the solar wind is supersonic — traveling faster than the speed of sound — and the HFA is strong enough to make it turn around.

The study regarding this phenomenon made by Glyn Collinson and David Sibeck, both from GSFC, appeared in Journal of Geophysica; Research.

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Author: Debjyoti Bardhan Google Profile for Debjyoti Bardhan
Is a science geek, currently pursuing some sort of a degree (called a PhD) in Physics at TIFR, Mumbai. An enthusiastic but useless amateur photographer, his most favourite activity is simply lazing around. He is interested in all things interesting and scientific.

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