The influence of sudden commencements on the rate of change of the surface horizontal magnetic field in the United Kingdom

first_imgSudden commencements (SCs) are rapid increases in the northward component of the surface geomagnetic field, related to sharp increases in the dynamic pressure of the solar wind. Large rates of change of the geomagnetic field can induce damaging currents in ground power networks. In this work, the effect of SCs on the (one minute) rate of change of the surface magnetic field (R) at three UK stations is investigated. The distributions of R during SCs are shifted to higher values than the data set as a whole. Rates of change greater than 10 nTmin‐1 are 30‐100 times more likely during SCs, though less than 8% of the most extreme R (≥ 99.99th percentile) are observed during SCs. SCs may also precede geomagnetic storms, another potential source of large R. We find that the probability of observing large R is greatly enhanced for three days following an SC. In the 24 hours following an SC it is 10 times more likely than at any given time to observe rates of change between 10 and several hundred nTmin‐1. Additionally, between 90 and 94% of data (depending on station) above the 99.97th percentile is recorded within three days of an SC. All values of R ≥ 200 nTmin‐1 in the UK have been observed within three days of an SC. These results suggest that accurately predicting sudden commencements is critically important to identify intervals during which power networks at similar geomagnetic latitudes to the UK are at risk from large GICs.last_img read more

Continue Reading

Manuel Pellegrini: Manchester City striker Sergio Aguero among world’s best

first_imgManuel Pellegrini has no doubt Sergio Aguero belongs in the world’s elite player bracket with Cristiano Ronaldo and Lionel Messi. It was a stunning return to form after a mixed start to the season in which the Argentinian had struck just once from open play and been hampered by a knee injury. Asked how the 27-year-old compared to the world’s best, Pellegrini said: “After what we have seen here, of course Kun is at that level. I have already said that after Ronaldo and Messi he is the best player in the world. He always makes important things (contributions) in competitions. “But the important thing is, not only for Kun, but as a team we must continue to improve, to win the Premier League again and to win the Champions League, because Messi and Ronaldo are always involved in that competition and that is very important for a player. “I think that this team is in that way (headed) and I’m very happy for us that in Kun we have a very important player.” Since being signed from Atletico Madrid for £38million in 2011, Aguero has finished as City’s outright top scorer in three out of four seasons. In the other year he shared the accolade with Carlos Tevez. His overall City tally now stands at 115 goals. Many of those goals have come in bursts, with the Argentina forward often suffering lean spells on return from injury. He suffered a setback last month after being hurt in a tackle from Crystal Palace’s Scott Dann but Pellegrini had no doubt the goals would soon return. He said: “Of course, I am always talking to all the players, especially when they are not in their best moments. “But the most encouraging thing for Kun is the way we play. We always play attractive, offensive football. We always put technical players in our starting XI to try to create the space (for him).” But the Manchester City boss accepts his star striker may need to win the Champions League for that view to become widespread. Aguero provided another demonstration of his formidable talents with five goals in a sensational 20-minute spell in Saturday’s 6-1 demolition of Newcastle. center_img Press Associationlast_img read more

Continue Reading

Wellington Police investigating alleged sexual assault in 1000 block of Shady Lane

first_imgSumner Newscow report — The Wellington Police Department is investigating a reported sexual assault in the 1000 Block of Shady Lane. A juvenile female reported being sexually assaulted by a 21-year-old male, according to a press release sent out today.The WPD arrested Michael D. Cook, 21, of Wellington at 1 a.m. Saturday.Cook was taken into custody and subsequently booked into the Sumner County jail, Wellington Police Chief Tracy Heath said. Follow us on Twitter. Close Forgot password? Please put in your email: Send me my password! Close message Login This blog post All blog posts Subscribe to this blog post’s comments through… RSS Feed Subscribe via email Subscribe Subscribe to this blog’s comments through… RSS Feed Subscribe via email Subscribe Follow the discussion Comments Logging you in… Close Login to IntenseDebate Or create an account Username or Email: Password: Forgot login? Cancel Login Close WordPress.com Username or Email: Password: Lost your password? Cancel Login Dashboard | Edit profile | Logout Logged in as Admin Options Disable comments for this page Save Settings You are about to flag this comment as being inappropriate. Please explain why you are flagging this comment in the text box below and submit your report. The blog admin will be notified. Thank you for your input. There are no comments posted yet. Be the first one! Post a new comment Enter text right here! Comment as a Guest, or login: Login to IntenseDebate Login to WordPress.com Login to Twitter Go back Tweet this comment Connected as (Logout) Email (optional) Not displayed publicly. Name Email Website (optional) Displayed next to your comments. Not displayed publicly. If you have a website, link to it here. Posting anonymously. Tweet this comment Submit Comment Subscribe to None Replies All new comments Comments by IntenseDebate Enter text right here! Reply as a Guest, or login: Login to IntenseDebate Login to WordPress.com Login to Twitter Go back Tweet this comment Connected as (Logout) Email (optional) Not displayed publicly. Name Email Website (optional) Displayed next to your comments. Not displayed publicly. If you have a website, link to it here. Posting anonymously. Tweet this comment Cancel Submit Comment Subscribe to None Replies All new commentslast_img read more

Continue Reading