Reconnection 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.
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 article
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