February 21, 2014

Image Caption: Giant perturbations called hot flow anomalies in the solar wind near Venus can pull the upper layers of its atmosphere, the ionosphere, up and away from the surface of the planet. Credit: NASA

Lee Rannals for redOrbit.com Your Universe Online

According to a study published in the Journal of Geophysical Research, space weather around Venus is much harsher than what is experienced around Earth.

Scientists have discovered that the space weather around Venus can have such large explosions that they are bigger than the entire planet. They also said that these giant explosions can happen multiple times per day.

Not only are they gigantic. but as Venus doesnt have a magnetic field to protect itself, the hot flow anomalies happen right on top of the planet. They could swallow the planet whole, said Glyn Collinson, a space scientist at NASAs Goddard Space Flight Center in Greenbelt, Md.

When the sun unleashes a large explosion of plasma, or a coronal mass ejection, it shoots out charged particles towards planets, creating space weather. Earths magnetosphere, the giant magnetic bubble surrounding the planet, helps to protect us from space weather. However, Venus doesnt have a chance to protect itself against such weather.

Venus is a barren, inhospitable planet that features an atmosphere so dense it can crush a spacecraft trying to land on its surface within hours. Because Venus has no magnetic protection, it makes it a great experiment for what Earth would look like without its magnetosphere.

Hot flow anomalies are unable to penetrate Earths magnetosphere to get down to the surface of the planet, and this releases so much energy just outside that the solar wind can be deflected and forced back towards the sun. However, the situation on Venus is much different than what is seen on Earth.

The only protection Venus has from the solar wind is the charged outer layer of its atmosphere known as the ionosphere. Scientists know that there is a sensitive pressure balance between the ionosphere and the solar wind, which can easily be disrupted by a big coronal mass ejection. The hot flow anomalies on Venus create dramatic, planet-scale disruptions, sucking the ionosphere up and away from the surface of the planet, according to the new study.

Read the original post:

Space Weather Around Venus Is Harsher Than That Around Earth