The Living With a Star (LWS) Sentinels

This paper gives a short account of the development of the living with a star Sentinels element. The Sentinels element is the heliospheric portion of the NASA program focused on improving our understanding of geo-effective events in the Sun–Earth connected system. The primary objectives of Sentinels are the investigation of the initiation and evolution of solar transients in the inner heliosphere, the acceleration and propagation of solar energetic particles, and the long term climatic change and structure of the inner heliosphere into which all of these geo-effective structures erupt. Due to the large volume of space to be covered, Sentinels will have to rely on, besides a dedicated mission, the observations of spacecraft from other programs of NASA and international partners along with a robust theoretical and modeling effort. The upcoming Sentinels Science and Technology Definition Team will develop specific details of this element.