As the solar wind rushes outward from the Sun at nearly a million miles per hour, it is stopped about 44,000 miles (70,800 kilometers) 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 space weather effects on Earth. Venus has no such protective shield, but it is still an immovable rock surrounded by an atmosphere that disrupts and interacts with the solar wind, causing interesting space weather effects.
A recent study has found clear evidence on Venus for a type of space weather outburst quite common on Earth, called a hot flow anomaly. These anomalies (HFAs) cause a temporary reversal of the solar wind that normally moves past a planet. An HFA surge causes the material to flood backward, said David Sibeck from NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
“They are an amazing phenomenon,” said 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 magnetic field 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,” said Glyn Collinson from NASA’s Goddard Space Flight Center.
“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 an HFA. 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 said. “But a day on Venus is 243 Earth days.”
Collinson looked for a pattern of magnetic change that would indicate the spacecraft 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 Collinson’s work eventually paid off. A combination of magnetic and plasma data shows that a venusian HFA did, indeed, take place 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,” said 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 aurorae.
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 Earth, HFAs have a big effect, but don’t necessarily rule the roost,” said 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 solar wind and the planet’s own ionosphere — a layer of atmosphere filled with charged particles. This boundary easily changes in height in response to the environment, 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 farther 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 planets throughout the solar system and, indeed, in other solar systems as well.