Roads agency SANRAL has slammed as a deliberate attempt to denigrate the agencya€™s reputation a report by Organisation Undoing Tax Abuse (OUTA) stating that the agency overpaid by more than R11bn for the R17.9bn Gauteng Freeway Improvement Project (GFIP).
Since coming to political power, the anticolonial movements of Angola, Mozambique, Zimbabwe, Namibia and South Africa have remained in control of the former settler coloniesa€™ societies. Belgium has charged two new suspects with terrorist offences in connection with last month's deadly Brussels airport and metro attacks, the federal prosecutor's office said Tuesday. The African National Congress (ANC) in Gauteng has resolved that President Zuma should 'do the right thing' following his apology over his handling on Nkandla. Louis van Gaal has warned his Manchester United players to prepare for the "Andy Carroll show" when they confront West Ham United and their marauding striker in Wednesday's FA Cup quarter-final replay. The feline had long vacated the bag but Allister Coetzee grinned like a Cheshire cat when he was finally installed as the new Springbok coach on Tuesday. Former England batsman Kevin Pietersen has said he could return to international cricket with his native South Africa. Englishman Danny Willett has broken into the top 10 of the world rankings for the first time after his dramatic victory in the Masters at Augusta on Sunday. Tennis player Maria Sharapova should not be judged by sport's 'morality police' for taking meldonium for 10 years before it was banned, according to British Olympian Susan Egelstaff.
Lewis Hamilton was drenched with a storm of abuse after professing his adoration for Bahrain culture. Giulio Zorzia€s who once shared a world championship podium with friend Cameron van der Burgha€s has gracefully given up on his Olympic dream. Muvhangoa€™s production team has urged the public to be aware of a scam purporting prospective actors to audition to become a part of the popular SABC 2 soapie. From the man who has worked alongside music power houses such as Brenda Fassie, Ringo Madlingozi and Busi Mhlongo, Bheki Nqoko, comes a long overdue beautiful afro soul album. Sunday Times and Delta Airlines are giving away three pairs of plane tickets to any American city. The new findings reveal variations in the earth's magnetic field over the shortest time scales yet but are far from straightforward. From warmest December on record to blizzards, wild winter sets records across the northeastern U.S.
Remember, we need your help to collect information on what is going on in your part of the world! Teasing out this subtle cycle, which subtracts and adds mere milliseconds to each day, also revealed a match between abrupt changes in the length of day and Earth's magnetic field. Seemingly negligible, these fleeting variations are mighty to those who study the planet and its core.
Lead study author Richard Holme suspects a shimmy in the solid inner core that drives the 5.9-year cycle, transferring angular momentum to the outer core. Researchers still actively debate how the fluid outer core produces our planet's protective magnetic field, which has weakened and flipped polarity many times in geologic history. Since geomagnetic jerks were first discovered in 1969, researchers have sought to explain and model how Earth's dynamo produces these quick changes in the magnetic field. Finding a connection with changes in the length of day provides a new way of thinking about the phenomenon, Holme said.
For example, the results could help modelers better understand how the core and mantle exchange angular momentum, Holme said. But Dumberry is not convinced that the study proves a link between jerks and changes in day length. Holme and de Viron removed these external and planetary effects from five decades of length of day data, exposing the 5.9-year period. A computer simulation shows the Earth's magnetic field lines and two poles, with blue lines directed inward and yellow lines directed outward.


The Earth's magnetic field is changing at an increasing rate, throwing off airports and altering the aurora borealis -- and its effect on ordinary compasses could mean the difference between homeward bound and hopelessly lost. Earth’s northernmost magnetic point -- or magnetic north -- is distinct from its geographic North Pole, and scientists have long known that the magnetic poles are on the move.
But the magnetic poles have been moving faster lately, sliding towards Siberia at 34 miles per year at a speed that's accelerated 36 percent over the last 10 years, according to the United States Geological Survey, or USGS. Since compasses rely on magnetic north to point you in the right way up the trail, the average $2-dollar model could very well point you in the wrong direction.
But don't touch that calibration dial just yet: The accuracy of compasses fluctuates with the field, he said, meaning compasses are more or less accurate depending on where you use them. The magnetic shift is costing the aviation and marine industries millions of dollars to upgrade navigational systems and charts, Florida's Sun Sentinel reported. Luckily for the younger generation, modern GPS technology is able to account and adjust for magnetic north’s deviation, also called magnetic declination. A spokesman for the National Park Service says cartographers aren’t scrambling to update their maps any time soon. There are other effects to the roaming pole as well: Americans will be less likely to see the aurora borealis, for example.
The polar shift is directly related to the movement of Earth’s magnetic field, which in turn, is related to the movement of Earth’s liquid iron core.
Fluctuations in the magnetic field have occurred for hundreds of thousands of years, so the shifting pole doesn’t exactly worry scientists. That's small consolation for someone looking to find their way home with a compass, of course. Add to the ever evolving nature of Earth’s magnetism the fact that the overall magnetic field has been decreasing as well. Image Caption: Changes in Earth’s magnetic field from January to June 2014 as measured by the Swarm constellation of satellites. The first set of high-resolution results from ESA’s three-satellite Swarm constellation reveals the most recent changes in the magnetic field that protects our planet. Launched in November 2013, Swarm is providing unprecedented insights into the complex workings of Earth’s magnetic field, which safeguards us from the bombarding cosmic radiation and charged particles. Measurements made over the past six months confirm the general trend of the field’s weakening, with the most dramatic declines over the Western Hemisphere.
But in other areas, such as the southern Indian Ocean, the magnetic field has strengthened since January.
This will provide new insight into many natural processes, from those occurring deep inside our planet to space weather triggered by solar activity. The first results were presented today at the ‘Third Swarm Science Meeting’ in Copenhagen, Denmark. Sofie Carsten Nielsen, Danish Minister of Higher Education and Science, highlighted the Danish contribution to the mission. Denmark’s National Space Institute, DTU Space, has a leading role – together with 10 European and Canadian research institutes – in the Swarm Satellite Constellation Application and Research Facility, which produces advanced models based on Swarm data describing each of the various sources of the measured field.
Although we know that the magnetic field originates from several sources, exactly how it is generated and why it changes is not yet fully understood. While studies show that even younger men battle the condition, most men may not be ready to talk about it. According to a report published today in Nature, scientists may have detected the beginning of the field's next such reversal.
Gauthier Hulot of the Institut de Physique du Globe de Paris and his colleagues used satellite data recorded 20 years apart to track changes in this field. According to Peter Olson of Johns Hopkins University, the "results confirm some long-held tenets of dynamo theory but contradict others." He cautions in a commentary accompanying the report that it remains too early to tell if the planet is in the early stage of a polarity reversal.


During these short-lived lurches in the magnetic field intensity, events called geomagnetic jerks, Earth's day also shifts by 0.1 millisecond, the researchers report.
Both yearly and millennial-scale changes in the field have been attributed to the swirling, spinning outer core. They then compared bumps in the cycle, which correspond to sudden jumps in the length of day, with geomagnetic jerks detected since 1969.
Depending on location and journey length, unaware hikers or boaters could find themselves hundreds of miles off course if they don’t calibrate for the shift, experts said. And scientists reassure the general public that the average individual will most likely not be affected at all by the shift in the magnetic field.
Airports across the country have repainted their runways so as to be more precise in terms of latitudinal and longitudinal coordinates, and many are planning to adjust in the future. Scientists have only been able to measure the intensity of the field since the 1830s, but ever since then, its strength has been on the decline, having decreased by about 10% since it was first measured. Over the coming months, scientists will analyze the data to unravel the magnetic contributions from other sources, namely the mantle, crust, oceans, ionosphere and magnetosphere.
In turn, this information will yield a better understanding of why the magnetic field is weakening.
Swarm continues the legacy of the Danish Orsted satellite, which is still operational, as well as the German Champ mission.
A cuboctahedron has 12 identical vertices, with 2 triangles and 2 squares meeting at each, and 24 identical edges, each separating a triangle from a square. In two regions of the boundary between the earth's core and the overlying mantle, the researchers detected a reversed magnetic field. The rotational effect helps scientists understand what's happening inside the Earth's core. Tracking changes in the magnetic field helps researchers create models of how the dynamo may work. But the electrical conductivity of the lower mantle (or the ease with which electrical charges flow within it) can't be too high, or it would cause a delay in the magnetic field responding to the rotational shift, Holme said. There is a remarkable correlation between a geomagnetic jerk in 2003 and a length of day change, but earlier links aren't as strong, he said.
On shorter time scales, earthquakes, melting glaciers, ocean currents and strong winds, such as the jet stream, can alter how fast the planet spins, shortening or lengthening a day by about 1 millisecond.
Since the core is convecting, it produces what Love referred to as a “naturally occurring electrical conductor.” And with electric current comes the magnetic field. The rapidity of the change has to do with the amount of activity going on in the earth’s core. But for those concerned with this polar shift -- or even a possible polar reversal -- Love says there is no need to worry in our lifetime. Shades of red represent areas of strengthening, while blues show areas of weakening over the 6-month period. Swarm’s core instrument – the Vector Field Magnetometer – was provided by the Technical University of Denmark. In a section lying beneath the southern tip of Africa, the magnetic field points toward the center of the earth opposite to the dominant outward-pointing field of the Southern Hemisphere. Instead, Holme and co-author Olivier de Viron of the Institut de Physique du Globe in Paris saw simultaneous geomagnetic jerks and jumps in the length of day. Having modeled the growth and movement of these inverted-flux sections, they can now account for nearly the entire decrease in the main dipole field of the earth over the past 150 years.



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