Space weather: Explosions on Venus

Mar 05, 2012
When discontinuities in the solar wind remain in contact with a planet's bow shock, they can collect a pool of hot particles that becomes a hot flow anomaly (HFA). An HFA on Venus most likely acts like a vacuum, pulling up parts of the planet’s atmosphere. Credit: Credit: NASA/Collinson

In the grand scheme of the solar system, Venus and Earth are almost the same distance from the sun. Yet the planets differ dramatically: Venus is some 100 times hotter than Earth and its days more than 200 times longer. The atmosphere on Venus is so thick that the longest any spacecraft has survived on its surface before being crushed is a little over two hours. There's another difference, too. Earth has a magnetic field and Venus does not – a crucial distinction when assessing the effects of the sun on each planet.

As the solar wind rushes outward from the sun at nearly a million miles per hour, it is stopped about 44,000 miles away from Earth when it collides with the giant magnetic envelope that surrounds the planet called the magnetosphere. Most of the solar wind flows around the magnetosphere, but in certain circumstances it can enter the magnetosphere to create a variety of dynamic effects on Earth. Venus has no such protective shield, but it is still an immovable rock surrounded by an that disrupts and interacts with the solar wind, causing interesting space weather effects.

A recent study, appearing online in the Journal of Geophysical Research on February 29, 2012, has found clear evidence on Venus for a type of space weather outburst quite common at Earth, called a hot flow anomaly. These anomalies, also known as HFAs, cause a temporary reversal of the solar wind that normally moves past a planet. An HFA surge causes the material to flood backward, says David Sibeck, a scientist at NASA's Goddard Space Flight Center in Greenbelt, Md., who studies HFAs at Earth and is a co-author on the paper.

"They are an amazing phenomenon," says Sibeck. "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."

Observing an HFA on Venus will help scientists tease out how space weather is similar and different at this planet so foreign to our own. With no to interact with, space weather at Venus is milder than that at Earth, but occurs much closer to the surface.

"Hot flow anomalies average one a day near Earth," says Goddard scientist Glyn Collinson and the first author on the new paper. "They've been seen at Saturn, they may have been seen at Mars, and now we're seeing them at Venus. But at Venus, since there's no protective magnetic field, the explosion happens right above the surface of the planet."

The search for this kind of space weather on Venus began in 2009 when NASA's Messenger satellite, which is actually a mission to study Mercury, spotted what may well have been an HFA at Venus. But Messenger's instruments could only measure a suggestive magnetic signature, not detect the temperature of the material inside, a necessary measurement to confirm the heat of a "hot" flow anomaly. For further evidence, Collinson turned to a European Space Agency spacecraft called Venus Express. Venus Express was not designed to study space weather phenomena per se, but it does have instruments that can detect magnetic fields and the charged particles, or plasma, that make up the solar wind. Collinson began to search for the telltale signatures of an HFA through a few days worth of data.

"That may not sound like much," he says. "But a day on Venus is 243 Earth days."

Collinson looked for a pattern of magnetic change that would indicate the traveled through one of these gigantic explosions. Envision what a bullet might experience if shot through a hot air balloon – a moment of heat in an otherwise fairly temperature-consistent journey. In this case, the heat comes with other characteristics as well: The boundaries show an abrupt change in the magnetic fields, and the inside is less dense than the outside. Given a set of instruments that were not specifically designed to find this signature, the search turned up quite a long list of potential, but not conclusive, events.

But his work eventually paid off. A combination of magnetic and plasma data shows that a Venusian hot flow anomaly did indeed take place on March 22, 2008.

By taking the Venus Express data and comparing it to the known physics at Earth, the scientists painted a possible picture of how an HFA forms at Venus. The moving solar wind with its attendant magnetic fields harbors discontinuities, areas where the magnetic fields change direction, sharply and abruptly. Sometimes these discontinuities align with the flow of the solar wind, so they remain in contact with what's called the bow shock – the place where the supersonic solar wind slows down abruptly and diverts around the planet. If such a discontinuity travels slowly across the bow shock it allows time to trap particles, collecting pools of 10 million degree plasma that can expand to be as big as Earth.

"These plasma particles are trapped in place," says Sibeck. "They make a big puddle that gets bigger and bigger, sending out its own shock waves. Everything downstream from that bubble is going to be different than what's upstream."

Those downstream disturbances are what make HFAs interesting. These eruptions create global disturbances far beyond the mere local disruption of a hot plasma explosion. These eruptions of solar material can compress the entire magnetosphere around Earth for minutes at a time, shaking the particles along magnetic lines and causing them to fall into Earth's atmosphere near the magnetic poles to create dayside aurora.

Understanding what the HFAs do in the non-magnetized Venusian environment, of course, would require direct observations that the current data sets from Venus Express do not provide. However Collinson and his colleagues have made some educated guesses. "At , HFAs have a big effect, but don't necessarily rule the roost," says Collinson. "But at Venus, since the HFA happens right up next to the planet, it is going to have a more dramatic effect on the system."

The bow shock on Venus serves as the boundary between the incoming , and the planet's own ionosphere – a layer of atmosphere filled with charged particles. This boundary changes in height easily in response to the environment, and so the scientists believe it would also respond strongly in the presence of an HFA. Since the HFA causes material to flow sunward, away from the planet, it may operate almost like a vacuum cleaner, pulling that bow shock further away from Venus. The size of the ionosphere would swell in concert.

That HFAs can occur on a planet without a magnetic field suggests that they may well happen on throughout the , and indeed in other solar systems as well.

Explore further: Venus Express spacecraft, low on fuel, does delicate dance above doom below

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User comments : 8

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5 / 5 (6) Mar 05, 2012
Venus is NOT 100 times hotter than earth.
The average temperature on Earth's surface is 287K, while on Venus it is ~740K, or ~2.6 times hotter.
2.8 / 5 (9) Mar 05, 2012
Venus also does have a magnetic field, its just rather weaker than ours, would have been rather more interesting if Venus did have a powerful field, the stuff of SciFi ;-)

5 / 5 (1) Mar 05, 2012
The batteries weren't crushed on the venera, they ran out. upper two comments are also correct. come on. you could of at least doubled checked the wiki for venus lol
1 / 5 (3) Mar 05, 2012
Wow. Did physorg PAY these idiots for this article?


Mindless minions of the mainstream make more mistakes.
1.6 / 5 (7) Mar 06, 2012
I can't wait until there's another lander/rover mission to Venus. There's still a lot that we don't know about the hostile world.
not rated yet Mar 06, 2012
Seems odd that this authority (not questioning that), makes this statement:

"They are an amazing phenomenon," says Sibeck. "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."

in light of the fact that the winds are not just supersonic (what? faster than 768 mph) but at about a million mph. Wouldn't a better phrase be 'beyond highly hypersonic' to at least hint at the direction of the magnitude?
not rated yet Mar 06, 2012
This is exactly why people should question any and all authorities always.. Thank you to all the subscribers who posted comments challenging this article and it's supposed facts that are, "Provided by NASA's Goddard Space Flight Center"... and published in this website I found today, called This is the first article I read and not sure if I came to the right place to learn something. Thanks again to people who know otherwise or think they know, take the time to post.
5 / 5 (2) Mar 07, 2012
@evilcleave - yes, question authorities. But most of all, question sensationalist headline writers. The 100x hotter comes from the temperature of the plasma pool near venus, not venus itself as the headline says.

@exnihilo - Supersonic refers to the speed of sound in the extremely hot plasma, not the speed of sound on earth. The speed of sound is proportional to the square-root [sqrt] of the temperature, and inversely to the sqrt of the molecular/atomic mass, so at 10,000,000 degrees (~30,000 time hotter than earth's air so sqrt of temp is ~170x higher ) in mostly hydrogen with a bit of helium (particle mass = ~1.2 versus ~29 for air so sqrt of mass is ~5x lower), the speed of sound would be roughly (plasma and air are a bit different) 170x * 5x = 850x higher than on earth. 850x768 mph is close enough to a million MPH that calling a million MPH supersonic rather than hypersonic is very reasonable.

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