Ulysses Spacecraft Flies Over Sun's North Pole | Aero-News Network
Aero-News Network
RSS icon RSS feed
podcast icon MP3 podcast
Subscribe Aero-News e-mail Newsletter Subscribe

Airborne Unlimited -- Most Recent Daily Episodes

Episode Date

Airborne-Monday

Airborne-Tuesday

Airborne-Wednesday Airborne-Thursday

Airborne-Friday

Airborne On YouTube

Airborne-Unlimited-05.05.25

Airborne-NextGen-05.06.25

AirborneUnlimited-05.07.25

Airborne-Unlimited-05.01.25

AirborneUnlimited-05.02.25

Tue, Jan 15, 2008

Ulysses Spacecraft Flies Over Sun's North Pole

Visit Comes After New Solar Cycle Detected

NASA's Ulysses spacecraft made a rare flyby of the sun's north pole Monday. Unlike any other spacecraft, Ulysses is able to sample winds at the sun's poles, which are difficult to study from Earth.

Ulysses has flown over the sun's poles three times before, in 1994-95, 2000-01 and 2007. Last week, solar physicists announced the first indications of a new solar cycle. Visiting the pole at this time may lead to new insights about solar activity.

"This is a wonderful opportunity to examine the sun's north pole within a transition of cycles," said Arik Posner, Ulysses program scientist at NASA Headquarters in Washington. "We've never done this before."

Many researchers believe the sun's poles are central to the 11-year ebb and flow of solar activity. When sunspots break up, their decaying magnetic fields are carried poleward by vast currents of plasma. This makes the poles a sort of graveyard for sunspots. Old magnetic fields sink beneath the polar surface 200,000 kilometers deep (about 124,000 miles), all the way down to the sun's inner magnetic dynamo, which generates the solar magnetic field. There, dynamo action amplifies the fields for use in future solar cycles.

"Just as Earth's poles are crucial to studies of terrestrial climate change, the sun's poles may be crucial to studies of the solar cycle," said Ed Smith, Ulysses project scientist at NASA's Jet Propulsion Laboratory, Pasadena, CA.

Each previous flyby revealed something interesting and mysterious. One puzzle has been the temperature of the sun's poles. In the previous solar cycle, the magnetic north pole was about 80,000 degrees Fahrenheit (more than 44,000 degrees Celsius), or 8 percent cooler than the south. The current flyby may help solve this puzzle because it comes less than a year after a similar south pole flyby in Feb. 2007. Mission scientists will be able to compare temperature measurements, north versus south, with hardly any gap between them.

Ulysses also discovered the sun's high-speed polar wind. At the sun's poles, the magnetic field opens up and allows solar atmosphere to stream out at a million miles per hour. By flying around the sun, covering all latitudes in a way that no other spacecraft can, Ulysses has been able to monitor this polar wind throughout the solar cycle and has found that it is acting a bit odd.

"Twelve years ago, just before the previous 'sea change' between solar cycles, the polar wind spilled down almost all the way to the sun's equator. But this time it is not. The polar wind is bottled up, confined to latitudes above 45 degrees, " said Posner.

Launched in October 1990 from the space shuttle Discovery, Ulysses is a joint mission of NASA and the European Space Agency.

FMI: http://ulysses.jpl.nasa.gov

Advertisement

More News

ANN's Daily Aero-Linx (05.06.25)

Aero Linx: International Federation of Airworthiness (IFA) We aim to be the most internationally respected independent authority on the subject of Airworthiness. IFA uniquely combi>[...]

ANN's Daily Aero-Term (05.06.25): Ultrahigh Frequency (UHF)

Ultrahigh Frequency (UHF) The frequency band between 300 and 3,000 MHz. The bank of radio frequencies used for military air/ground voice communications. In some instances this may >[...]

ANN FAQ: Q&A 101

A Few Questions AND Answers To Help You Get MORE Out of ANN! 1) I forgot my password. How do I find it? 1) Easy... click here and give us your e-mail address--we'll send it to you >[...]

Classic Aero-TV: Virtual Reality Painting--PPG Leverages Technology for Training

From 2019 (YouTube Edition): Learning To Paint Without Getting Any On Your Hands PPG's Aerospace Coatings Academy is a tool designed to teach everything one needs to know about all>[...]

Airborne 05.02.25: Joby Crewed Milestone, Diamond Club, Canadian Pilot Insurance

Also: Sustainable Aircraft Test Put Aside, More Falcon 9 Ops, Wyoming ANG Rescue, Oreo Cookie Into Orbit Joby Aviation has reason to celebrate, recently completing its first full t>[...]

blog comments powered by Disqus



Advertisement

Advertisement

Podcasts

Advertisement

© 2007 - 2025 Web Development & Design by Pauli Systems, LC