STEREO IMPACT Investigation Goals, Measurements, and Data Products Overview

Luhmann, J. G.; Curtis, D. W.; Schroeder, P.; McCauley, Jeremy; Lin, R. P.; Larson, D. E.; Bale, S. D.; Sauvaud, J. A.; Aoustin, C.; Mewaldt, R. A.; Cummings, A. C.; Stone, E. C.; Davis, A. J.; Cook, W. R.; Kecman, B.; Wiedenbeck, M. E.; Rosenvinge, Tycho von; Acuña, M. H.; Reichenthal, Lillian; Shuman, S.; Wortman, Kristin; Reames, D. V.; Mueller-Mellin, R.; Kunow, H.; Mason, G. M.; Walpole, P.; Korth, A.; Sanderson, T. R.; Russell, C. T.; Gosling, J. T.

doi:10.1007/s11214-007-9170-x

Cited by 283 publications

(176 citation statements)

References 163 publications

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“…By analyzing the velocity dispersion of these impulsively accelerated electrons, the field line length can be obtained in both ICMEs, where the lengths can be several times the typical Parker spiral length at the outer edge of the twisted field of a magnetic flux rope (see Fig. 2 in Luhmann et al 2007[from Larson et al 1997, and in the quiet interplanetary medium.…”

Section: Scientific Objectivesmentioning

confidence: 99%

“…The SupraThermal Electron (STE) instrument is part of the IMPACT (In-situ Measurements of Particles And CME Transients) investigation (see Luhmann et al 2007, for overview), one of the four instrument packages on both spacecraft of NASA's STEREO (Solar TERrestrial RElations Observatory) mission. STE is designed to measure the ∼2-100 keV suprathermal "superhalo" electrons (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…The fluxes of suprathermal electrons, however, are typically many orders of magnitude lower than the solar wind halo and strahl electrons (see Fig. 18, panels a & b, of Luhmann et al 2007). STE is designed to provide about 2 orders of magnitude increase in sensitivity over previous measurements in the ∼2 to 20-30 keV energy range, by extending the range of silicon semiconductor detectors (SSDs) for particle detection down to ∼2 keV.…”

Section: Introductionmentioning

confidence: 99%

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The STEREO IMPACT Suprathermal Electron (STE) Instrument

et al. 2008

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The Suprathermal Electron (STE) instrument, part of the IMPACT investigation on both spacecraft of NASA's STEREO mission, is designed to measure electrons from ∼2 to ∼100 keV. This is the primary energy range for impulsive electron/ 3 He-rich energetic particle events that are the most frequently occurring transient particle emissions from the Sun, for the electrons that generate solar type III radio emission, for the shock accelerated electrons that produce type II radio emission, and for the superhalo electrons (whose origin is unknown) that are present in the interplanetary medium even during the quietest times. These electrons are ideal for tracing heliospheric magnetic field lines back to their source regions on the Sun and for determining field line lengths, thus probing the structure of interplanetary coronal mass ejections (ICMEs) and of the ambient inner heliosphere. STE utilizes arrays of small, passively cooled thin window silicon semiconductor detectors, coupled to state-of-the-art pulse-reset front-end electronics, to detect electrons down to ∼2 keV with about 2 orders of magnitude increase in sensitivity over previous sensors at energies below ∼20 keV. STE provides energy resolution of E/E ∼ 10-25% and the angular resolution of ∼20°over two oppositely directed ∼80°× 80°fields of view centered on the nominal Parker spiral field direction.

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Section: Scientific Objectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The STEREO IMPACT Suprathermal Electron (STE) Instrument

et al. 2008

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“…As part of the In situ Measurements of Particles and CME Transients (IMPACT) experiment (Luhmann et al 2008), the Solar Wind Electron Analyzer (SWEA) instruments (Sauvaud et al 2008) provide in situ electron measurements at both STEREO spacecraft. The SWEA instruments are hemispheric top-hat electrostatic analyzers (Carlson and McFaden 1998) with deflector plates mounted at the aperture and with microchannel plate (MCP) detectors.…”

Section: Introductionmentioning

confidence: 99%

The IMPACT Solar Wind Electron Analyzer (SWEA): Reconstruction of the SWEA Transmission Function by Numerical Simulation and Data Analysis

et al. 2011

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The IMPACT SWEA instruments on board the twin STEREO spacecraft detect the solar wind electrons with energies between 1 and 2000 eV. The instruments provide 3-dimensional velocity distributions, pitch angle distributions and solar wind properties at two vantage points in the ecliptic at 1 AU. A few days after launch suppression of the low energy solar wind electrons was detected, which makes data analysis challenging and causes a significant loss of information below 50 eV. This paper describes the methods used to both understand the nature of the problem and to recover the most information about the low energy solar wind electrons from the measured datasets. These include numerical simulations, in-flight calibration results, and data reconstruction methods that allow the calculation of solar wind parameter proxies with minor limitations.

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“…This equation will be used to analyze the following events. For STEREO, we use the 1-min time resolution data from the following two instrument suites: In-situ Measurements of Particles and CME Transients (IMPACT, Luhmann et al, 2008), as well as the Plasma and Suprathermal Ion Composition (PLASTIC, Galvin et al, 2008). To analyze some fine-scale structures, such as shocks, the 8 Hz magnetic field data from the Magnetic Field Experiment (Acuña et al, 2008) are also used.…”

Section: Introductionmentioning

confidence: 99%

Multi-Spacecraft Observations: Stream Interactions and Associated Structures

et al. 2009

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The stream interaction region (SIR), formed when a fast stream overtakes a preceding slow stream, is the predominant large-scale solar wind structure at this early phase of the STEREO mission. Using multi-spacecraft observations from STEREO A and B, ACE, Wind, and Ulysses in 2007, we analyze three stream interaction events in depth in May, August, and November of 2007, respectively, when the spacecraft had quite different spatial separations. We attempt to determine the causes of the differences in the SIR properties, whether they are spatial or temporal variations, and also to examine the steepening or widening of the SIR during its radial evolution. The presence and characteristics of associated shocks, the relation to the heliospheric current sheet, and other structures are also studied.

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STEREO IMPACT Investigation Goals, Measurements, and Data Products Overview

Cited by 283 publications

References 163 publications

The STEREO IMPACT Suprathermal Electron (STE) Instrument

The STEREO IMPACT Suprathermal Electron (STE) Instrument

The IMPACT Solar Wind Electron Analyzer (SWEA): Reconstruction of the SWEA Transmission Function by Numerical Simulation and Data Analysis

Multi-Spacecraft Observations: Stream Interactions and Associated Structures

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