How enigmatic ribbon formed at edge of solar system

Washington, February 6(ANI): NASA's Interstellar Boundary Explorer (IBEX), which was launch in October 2008, has been providing images of the invisible interactions between our home in the galaxy and interstellar space.

Particles emanating from this boundary produce a striking, narrow ribbon, which had yet to be explained despite more than a dozen possible theories.

In a new "retention model," researchers from the University of New Hampshire and Southwest Research Institute suggest that charged particles trapped in this region create the ribbon as they escape as neutral atoms.

The Sun continually sends out a solar wind of charged particles or ions traveling in all directions at supersonic speeds. IBEX cameras measure energetic neutral atoms (ENAs) that form when charged particles become neutralized.

As solar wind ENAs leave the solar system, the majority move out in various directions, never to re-enter. However, some ENAs leave the solar system and impact other neutral atoms, becoming charges particles again. These newly formed pickup ions begin to gyrate around the local interstellar magnetic field just outside the solar system.

In the regions where the magnetic field is perpendicular to their initial motion, they scatter rapidly and pile up. From those regions, some of those particles return to the solar system as secondary ENAs-ENAs that leave the solar system and become charged and then re-neutralized, only to travel back into the solar system as ENAs a second time.

"The syrup you pour on a pancake piles up before slowly oozing out to the sides. The secondary ENAs coming into the solar system after having been temporarily trapped in a region just outside the solar system do the same thing. As they pile up and get trapped or retained, they produce higher fluxes of ENAs from this region and form the bright ribbon seen by IBEX," explained Dr. David McComas, IBEX principal investigator and assistant vice president of the SwRI Space Science and Engineering Division.

ENA energies observed in the ribbon correlate to the speed of the solar wind, which is slower (around 1 million miles per hour) at low latitudes and faster (up to 2 million miles per hour) at high latitudes.

"This was the clue that made us think the ribbon was caused by a secondary ENA source, because it so directly reflects the latitudinal structure of the solar wind," said McComas.

Simulations using a realistic solar wind structure showed remarkably good association with the IBEX data, closely reproducing the observed ribbon structure, location, and latitudinal ordering by energy. Thus far, the retention model appears best able to reproduce the IBEX observations.

However, more studies are needed to confirm if variations in the solar wind affect the ribbon, as theorized.

Using information provided by this new model, future studies of the ribbon could help determine the properties of the nearby galactic magnetic field, opening a window into the physics of the nearby galactic medium. In addition, the IBEX ribbon could provide researchers with a means for measuring the strength of the interstellar magnetic field, as well as its direction. (ANI)

Matches

MORE TOP STORIES TODAY

Royal test for Kings

Royal test for Kings

Preview — Clash of philosophies between Australia-centric teams More »

Duminy steals first win for Delhi

Duminy steals first win for Delhi

Furious fifties by Duminy and Dinesh Karthik end a long losing streak for the Daredevils. More »

AB, Parthiv seal Bangalore's second win

AB, Parthiv seal Bangalore's second win

Royal Challengers overcame a stutter to cruise to the small target they were set by Mumbai Indians. More »

‘Felt like helpless minority’

‘Felt like helpless minority’

Former BCCI treasurer Ajay Shirke says emotions got the better of the Srinivasan and he tried to oversimplify things by calling Meiyappan an “enthusia… More »

Glenn Maxwell carves his parallel universe

Glenn Maxwell carves his parallel universe

Glenn Maxwell seems to project an icy disdain when at the crease. Match situations rarely faze him and the bubble in which he plays excludes everyone … More »

No way back for Pietersen: ECB

No way back for Pietersen: ECB

Kevin Pietersen's hopes of reviving his international career appeared to end Saturday when ECB managing director Paul Downton said there was 'no way back'… More »

Srinivasan can attend BCCI meeting

Srinivasan can attend BCCI meeting

His status as president of TNCA makes him eligible to attend the Working Committee meeting on Sunday. More »

The world record that nearly wasn't

The world record that nearly wasn't

Twenty years ago this week, Brian Lara became Test cricket's highest scorer, but he almost didn't make it. More »

Moores gets second stint as coach

Moores gets second stint as coach

In a two-year spell from 2007 to 2009, the 51-year-old Moores led England in seven Test series. More »

BCCI is not anybody’s property — Dalmiya

BCCI is not anybody’s property — Dalmiya

Dalmiya feels that Srinivasan’s ‘power hungry’ attitude isn’t helping matters. More »

Tough for bowlers: Saeed Ajmal

Tough for bowlers: Saeed Ajmal

The 36-year-old believes the T20 format and rule changes in 50-over matches have made a real difference. More »

Bangladesh senior players to see shrink

Bangladesh senior players to see shrink

Bangladesh's senior players will have three sessions with a psychological skill development coach later this month More »

KP ridicules idea of day-night Tests

KP ridicules idea of day-night Tests

Kevin Pietersen has ridiculed the idea of day-night Test cricket, saying the game would be so different to proper Test cricket that we will need a whole… More »

Rajasthan edge low-scoring thriller

Rajasthan edge low-scoring thriller

The bowlers restricted Hyderabad to 133 for 6 before Rahane and Binny took Rajasthan over the line. More »

BCCI members want independent probe

BCCI members want independent probe

The board members are realising after the Supreme Court's observations that something has to be done — IS Bindra More »

Maxwell blitz takes Punjab home

Maxwell blitz takes Punjab home

The Kings XI batsman blasted a 43-ball 95 to help his team pull off a massive chase against Chennai Super Kings. More »

'BCCI lacks leaders to take on Srini'

'BCCI lacks leaders to take on Srini'

Two former BCCI presidents, Shashank Manohar and Jagmohan Dalmiya, have reacted strongly to the news of the BCCI calling an emergent meeting on Sunday… More »

Delhi look for first points against confident Kolkata

Delhi look for first points against confident Kolkata

Preview — The threat of Sunil Narine looms large again. More »

Bangalore vs Mumbai: A battle of the big-hitters

Bangalore vs Mumbai: A battle of the big-hitters

Preview — Given the firepower in both line-ups, Dubai crowd may see another high-scorer More »

Yuvraj tees off to Sharjah's delight

Yuvraj tees off to Sharjah's delight

Yuvraj Singh was hardly convincing to begin with against Delhi, but a big dose of crowd support and a helping of poor bowling meant he had the opportunity… More »

Stressed Trott stands down again

Stressed Trott stands down again

The England and Wales Cricket Board (ECB) on Friday confirmed that batsman Jonathan Trott is to take another break from all cricket with immediate eff… More »

PCB starts another coach hunt

PCB starts another coach hunt

The PCB has decided to not extend the contracts of head coach Moin Khan, fielding coach Shoaib Mohammad and batting consultant Zaheer Abbas, and has invited… More »

Fiery star Stokes bids to curb his temper

Fiery star Stokes bids to curb his temper

England all-rounder Ben Stokes admits he must keep his anger under control if he is to end his international exile. More »

Bangalore's arsenal blazes to victory

Bangalore's arsenal blazes to victory

Yuvraj Singh was back to his best in his first match for Royal Challengers Bangalore. More »