The NOAA Goes-12 Solar X-Ray Imager (SXI) 2. Performance

Pizzo, V. J.; Hill, S. M.; Balch, C. C.; Biesecker, D. A.; Bornmann, P. L.; Hildner, E.; Grubb, R. N.; Chipman, E. G.; Davis, John M.; Wallace, Kotska; Russell, Kenneth J.; Cauffman, Sandra; Saha, Timo T.; Berthiume, G. D.

doi:10.1007/s11207-005-7417-9

Cited by 50 publications

(31 citation statements)

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“…SMEI on Coriolis (Jackson et al 2004) provides wide-field coronagraph images from an Earth-orbiting Air Force satellite platform, and is ideally suited for STEREO HI comparisons and in situ comparisons. SXI on NOAA's GOES-M approximates Yohkoh soft X-ray images at a 1-minute cadence in a softer, more sensitive, X-ray band geared toward coronal studies (Pizzo et al 2005). Both these imagers complement STEREO imaging, and enhance IMPACT science by providing a more complete description of the coronal events preceding detected ICMEs.…”

Section: Relationships To Other Missions and Ground-based Observationsmentioning

confidence: 92%

STEREO IMPACT Investigation Goals, Measurements, and Data Products Overview

et al. 2007

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The IMPACT (In situ Measurements of Particles And CME Transients) investigation on the STEREO mission was designed and developed to provide multipoint solar wind and suprathermal electron, interplanetary magnetic field, and solar energetic particle information required to unravel the nature of coronal mass ejections and their heliospheric consequences. IMPACT consists of seven individual sensors which are packaged into a boom suite, and a SEP suite. This review summarizes the science objectives of IMPACT, the instruments that comprise the IMPACT investigation, the accommodation of IMPACT on the STEREO twin spacecraft, and the overall data products that will flow from the IMPACT measurements. Accompanying papers in this volume of Space Science Reviews highlight the individual sensor technical details and capabilities, STEREO project plans for the use of IMPACT data, and modeling activities for IMPACT (and other STEREO) data interpretation.

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Section: Relationships To Other Missions and Ground-based Observationsmentioning

confidence: 92%

STEREO IMPACT Investigation Goals, Measurements, and Data Products Overview

et al. 2007

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“…This long duration flare started at ≈14:20 UT, after a series of impulsive compact flares occurring over a period of two hours. The 1−8 Å soft X-ray flux peaked at ≈15:20 UT, and during the decay phase, the Solar X-ray Imager (SXI; Pizzo et al 2005) onboard the GOES satellite showed a huge cusped post-eruption loop-system south of NOAA 10652, revealing that the eruption occurred in between NOAA 10652 and NOAA 10653.…”

Section: Application Of the Model To The Cme Of 25 July 2004mentioning

confidence: 99%

The role of aerodynamic drag in propagation of interplanetary coronal mass ejections

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Žic

Falkenberg

et al. 2010

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Context. The propagation of interplanetary coronal mass ejections (ICMEs) and the forecast of their arrival on Earth is one of the central issues of space weather studies. Aims. We investigate to which degree various ICME parameters (mass, size, take-off speed) and the ambient solar-wind parameters (density and velocity) affect the ICME Sun-Earth transit time. Methods. We study solutions of a drag-based equation of motion by systematically varying the input parameters. The analysis is focused on ICME transit times and 1 AU velocities. Results. The model results reveal that wide ICMEs of low masses adjust to the solar-wind speed already close to the sun, so the transit time is determined primarily by the solar-wind speed. The shortest transit times and accordingly the highest 1 AU velocities are related to narrow and massive ICMEs (i.e. high-density eruptions) propagating in high-speed solar wind streams. We apply the model to the Sun-Earth event associated with the CME of 25 July 2004 and compare the results with the outcome of the numerical MHD modeling.

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“…Solar coronal-hole fractional areas were determined from soft X-ray images acquired by the Soft X-ray Imager (SXI; Hill et al 2005;Pizzo et al 2005) onboard the GOES-12 spacecraft 2 . For our purposes, we used four SXI coronal images per day taken around 0, 6, 12, and 18 UT.…”

Section: Datamentioning

confidence: 99%

Equatorial coronal holes, solar wind high-speed streams, and their geoeffectiveness

Verbanac

Vršnak

Veronig

et al. 2010

A&A

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Context. Solar wind high-speed streams (HSSs), originating in equatorial coronal holes (CHs), are the main driver of the geomagnetic activity in the late-declining phase of the solar cycle. Aims. We analyze correlations between CH characteristics, HSSs parameters, and the geomagnetic activity indices, to establish empirical relationships that would provide forecasting of the solar wind characteristics, as well as the effect of HSSs on the geomagnetic activity in periods when the effect of coronal mass ejections is low. Methods. We apply the cross-correlation analysis to the fractional CH area (CH) measured between central meridian distances ±10• , solar wind parameters (flow velocity V, proton density n, temperature T , and the magnetic field B), and the geomagnetic indices Dst and Ap. Results. The cross-correlation analysis reveals a high degree of correlation between all studied parameters. In particular, we show that the Ap index is considerably more sensitive to HSS and CH characteristics than Dst. The Ap and Dst indices are most tightly correlated with the solar wind parameter BV 2 . Conclusions. From the point of view of space weather, the most important result is that the established empirical relationships provide a few-days-in-advance forecasting of the HSS characteristics and the related geomagnetic activity at the six-hour resolution.

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The NOAA Goes-12 Solar X-Ray Imager (SXI) 2. Performance

Cited by 50 publications

References 9 publications

STEREO IMPACT Investigation Goals, Measurements, and Data Products Overview

STEREO IMPACT Investigation Goals, Measurements, and Data Products Overview

The role of aerodynamic drag in propagation of interplanetary coronal mass ejections

Equatorial coronal holes, solar wind high-speed streams, and their geoeffectiveness

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