摘要:

In the course of this decade, two NASA deep space mission to the inner and outer heliosphere, MESSENGER to the planet Mercury and New Horizons to the planet Pluto, will carry onboard energetic particle spectrometers. The combination of measurements near the Sun (0.3 AU), and from the outer heliosphere (up to almost 40 AU), will ideally complement the information available from Ulysses and from near‐Earth orbiting spacecraft, yielding boundary conditions on the processes that accelerate energetic particles. EPS is a hockey‐puck‐size Time‐of‐Flight (ToF) spectrometer that measures ions and electrons over a broad range of energies and pitch angles. Particle composition and energy spectra will be measured for H to Fe from 15 keV/nucleon to 3 MeV/nucleon and for electrons from 15 keV to 1 MeV. The ion section of EPS is a compact ToF telescope with two main components: a ToF section and a Solid State Detector (SSD) array to measure separately velocity and total energy of the incoming particles. Electrons are identified in EPS by the presence of an energy signal and by the absence of start or stop pulses, since energetic electrons have low efficiency for production of secondary electrons when passing through thin foils. For both ions and electrons the angle of arrival is determined by the position of the solid‐state detector that collects the particle. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1618721

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

The Heliospheric Constellation (HELICON) mission concept calls for the first constellation of spacecraft to make coordinated measurements of the solar wind magnetic field, plasma and energetic particle distributions and composition in order to determine scale‐lengths of solar wind structures and to resolve ambiguities in temporal and spatial variability. Specifically, HELICON enables the resolution of a wide array of critical questions of solar wind structure and dynamics. The HELICON’s Science Objectives are as follows: (1) Determine the structure and evolution of expanding interplanetary coronal mass ejections, (2) Use supra‐thermal and energetic particles to determine the source populations of solar events and the scale sizes of Interplanetary Coronal Mass Ejections (ICMEs) and Corotating Interaction Regions (CIRs) (3) Determine the structure and nature of the heliospheric current sheet, and (4) Examine the causes of variability in the solar wind. This brief report describes the mission concept and scientific rationale for such a mission. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1618722

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

The Herschel (HElium Resonant Scattering in the Corona and HELiosphere) experiment, to be flown on a sounding rocket, will investigate the helium coronal abundance and the solar wind acceleration from a range of solar source structures by obtaining the first simultaneous observations of the electron, proton and helium solar corona. The HERSCHEL payload consists of the EUV Imaging Telescope (EIT), that resembles the SOHO/EIT instrument, and the Ultraviolet and Visible Coronagraph (UVC).UVC is an imaging coronagraph that will image the solar corona from 1.4 to 4 solar radii in the EUV lines of HI 121.6 nm and the HeII 30.4 nm and in the visible broadband polarized brightness. The UVC coronagraph is externally occulted with a novel design as far as the stray light rejection is concerned. Therefore, HERSCHEL will also establish proof‐of‐principle for the Ultraviolet Coronagraph, which is in the ESA Solar Orbiter Mission baseline.The scientific objectives of the experiment will be discussed, togetherwith a description of the UVC coronagraph. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1618723

出版商:AIP    

年代:1903

数据来源: AIP

摘要:

Direct detection of interstellar neutrals is a powerful technique for enlarging our knowledge about the media surrounding our solar system. We present in this paper a combination of two telescopes and a pointing device that would enable precise and detailed measurements of the density, velocity, temperature, and composition of the neutral particles that penetrate through the heliospheric bow shock and the heliopause. © 2003 American Institute of Physics

ISSN:0094-243X    

DOI:10.1063/1.1618724

出版商:AIP    

年代:1903

数据来源: AIP