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Some comments on transient and steady-state reconnection at the dayside magnetopause

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first_imgReconnection at the dayside magnetopause is the principal method by which energy is transferred from the solar wind into the magnetosphere-ionosphere system. There is still considerable uncertainty as to whether reconnection is transient or quasi-steady. Here we discuss some of the implications of assuming that reconnection occurring in regions where the magnetosheath flow is super-Alfvénic must be transient. We use a simple magnetospheric model to illustrate where on the magnetopause transient reconnection is most likely to occur, and show that the location of these regions is dependent critically upon the dipole tilt angle and the interplanetary magnetic field orientation. Although our idealised examples do not take into account temporal variations of the solar wind conditions, or the influence of the bow shock or magnetosheath, we believe that they demonstrate interesting features. For example, the results suggest that reconnection for northward IMF is almost always likely to be transient.last_img read more

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Spanish Frigate Engages in Missile Defense Exercise

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first_img View post tag: Spanish Spanish Frigate Engages in Missile Defense Exercise Authorities View post tag: ASD 15 View post tag: Missile View post tag: europe Back to overview,Home naval-today Spanish Frigate Engages in Missile Defense Exercise View post tag: Exercise View post tag: Defense View post tag: Frigate The Spanish frigate Almirante Juan de Borbón (F-102) is taking part in the multinational sea-based missile defense exercise “At Sea Demonstration 15” (ASD-15) in Scottish waters along with other warships from the Netherlands, USA, United Kingdom, France, Italy, Canada and Norway. The Spanish Navy frigate is therefore contributing to NATO’s ballistic missile defense system while she also takes the opportunity to train in other conventional air defense tactics.In this ASD-15 edition, the F-102 detected and tracked a ballistic missile during its trajectory out of the atmosphere. The target was subsequently destroyed by an AA missile launched from a US Navy destroyer. Other ships from the multinational force activated their defense systems against two targets simulating anti-ship missiles.This is the third time the Spanish frigate has successfully detected and tracked a target of this type, thanks to the new capability recently installed on board.Originally established at the end of the 90’s, the MTMD (Maritime Theatre Missile Defense) Forum, which comprises NATO and non-NATO nations was conceived as a co-operation body for participating navies to develop improved cooperation and interoperability in sea-based missile defense using a common command and control system.The trials and exercises will continue in the coming days. The Almirante Juan de Borbón is scheduled to launch an Evolved Sea Sparrow Missile (ESSM) against a target simulating a modern anti-ship missile. The frigate will return to her home port at the beginning of November.Image: Spanish Navy October 22, 2015 Share this articlelast_img read more

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Other Sports Saina Nehwal, Kidambi Srikanth Exit Denmark Open Badminton

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first_imgOdense: Top Indian shuttlers Saina Nehwal and Kidambi Srikanth on Wednesday suffered first round losses in the Denmark Open women’s and men’s singles competitions in Odense, Denmark on Wednesday. Saina continued with her struggling form, losing to Japan’s Sayaka Takahashi 15-21 21-23 in the match that lasted 37 minutes to crash out of the USD 775,000 tournament. The 29-year-old London Olympics bronze medallist was the runner-up last year. World number 8 Saina has been going through a tough phase with fitness issues since claiming the Indonesia Masters in January. She had also made first-round exits at the China Open and Korea Open earlier this year.World number 12 Takahashi had defeated Saina the last time they met at the Thailand Open in August. In the men’s singles first round, former champion Kidambi Srikanth lost to fourth seed Anders Antonsen of Denmark 14-21 18-21 in the match that lasted 43 minutes. Srikanth, who had skipped China and Korea Open due to a knee issue, had beaten Antonsen at the 2017 World Championships, but the Danish shuttler has come a long way since then, having reached the finals of this year’s World Championships in Switzerland.  Currently ranked fourth, Antonsen has won the Indonesia Masters, Barcelona Spain Masters, European Games and made it to the finals at Indonesia Open Super 1000 this year. Sameer Verma, however, crossed the first hurdle in the men’s singles when he beat Kanta Tsuneyama of Japan 21-11 21-11 in 29 minutes to advance to the second round. The Indian mixed doubles pair of Pranaav Jerry Chopra and N Sikki Reddy also made it to the second round with a 21-16 21-11 win over the German duo of Marvin Seidel and Linda Efler.  Also Read | Kidambi Srikanth loses to Olympic champion Chen Long in Malaysia Open badmintonIn another mixed doubles first round match, Satwiksairaj Ranki and Ashwini Ponnappa did not take the court and conceded a walk over to the second seeded Chinese pair of Wang Yi Lyu and Huang Dong Ping. For all the Latest Sports News News, Other Sports News, Download News Nation Android and iOS Mobile Apps.last_img read more

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