The NOAA Goes-12 Solar X-Ray Imager (SXI) 1. Instrument, Operations, and Data

Hill, S. M.; Pizzo, V. J.; Balch, C. C.; Biesecker, D. A.; Bornmann, P. L.; Hildner, E.; Lewis, LD; Grubb, R. N.; Husler, M. P.; Prendergast, K.; Vickroy, J.; Greer, Sandra C.; Defoor, T.; Wilkinson, D. C.; Hooker, R. Brian; Mulligan, P.; Chipman, E. G.; Bysal, Hyre; Douglas, John; Reynolds, Richard W.; Davis, John M.; Wallace, Kotska; Russell, Kenneth J.; Freestone, Kathleen; Bagdigian, D.; Page, Timothy P.; Kerns, S.E.; Hoffman, Ross N.; Cauffman, Sandra; Davis, Martin A.; Studer, R.; Berthiaume, François; Saha, Timo T.; Berthiume, G. D.; Farthing, H.; Zimmermann, Frank

doi:10.1007/s11207-005-7416-x

Cited by 86 publications

(38 citation statements)

References 17 publications

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“…Observing always in full-disk mode, the Solar X-Ray Imager (SXI; see Hill et al, 2005; Pizzo et al, 2005) aboard the GOES-12 satellite has been more successful in recording coronal waves. Thanks to its cadence (2 -4 min) SXI has provided a valuable link between the Moreton waves observed close to the AR and the remote EIT fronts.…”

Section: Soft X-rays (Sxr)mentioning

confidence: 99%

Large-scale Globally Propagating Coronal Waves

Warmuth

2015

Living Rev. Sol. Phys.

162

140

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Large-scale, globally propagating wave-like disturbances have been observed in the solar chromosphere and by inference in the corona since the 1960s. However, detailed analysis of these phenomena has only been conducted since the late 1990s. This was prompted by the availability of high-cadence coronal imaging data from numerous spaced-based instruments, which routinely show spectacular globally propagating bright fronts. Coronal waves, as these perturbations are usually referred to, have now been observed in a wide range of spectral channels, yielding a wealth of information. Many findings have supported the "classical" interpretation of the disturbances: fast-mode MHD waves or shocks that are propagating in the solar corona. However, observations that seemed inconsistent with this picture have stimulated the development of alternative models in which "pseudo waves" are generated by magnetic reconfiguration in the framework of an expanding coronal mass ejection. This has resulted in a vigorous debate on the physical nature of these disturbances. This review focuses on demonstrating how the numerous observational findings of the last one and a half decades can be used to constrain our models of large-scale coronal waves, and how a coherent physical understanding of these disturbances is finally emerging. Article RevisionsLiving Reviews supports two ways of keeping its articles up-to-date:Fast-track revision. A fast-track revision provides the author with the opportunity to add short notices of current research results, trends and developments, or important publications to the article. A fast-track revision is refereed by the responsible subject editor. If an article has undergone a fast-track revision, a summary of changes will be listed here.Major update. A major update will include substantial changes and additions and is subject to full external refereeing. It is published with a new publication number.For detailed documentation of an article's evolution, please refer to the history document of the article's online version at http://dx

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Section: Soft X-rays (Sxr)mentioning

confidence: 99%

Large-scale Globally Propagating Coronal Waves

Warmuth

2015

Living Rev. Sol. Phys.

162

140

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“…Daily solar coronal hole areas were determined employing the data from Solar X-Ray Imager (SXI) on board the GOES-12 satellite, where the coronal holes appear as dark features in X-ray images (Hill 2005;Pizzo 2005 Vršnak et al (2007b).…”

Section: Methodsmentioning

confidence: 99%

Cosmic ray modulation by corotating interaction regions

et al. 2008

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Abstract. We analyzed the relationship between the ground-based modulation of cosmic rays (CR) and corotating interaction regions (CIRs). Daily averaged data from 8 different neutron monitor (NM) stations were used, covering rigidities from Rc = 0 -12.91 GeV. The in situ solar wind data were taken from the Advanced Composition Explorer (ACE) database, whereas the coronal hole (CH) areas were derived from the Solar X-Ray Imager onboard GOES-12. For the analysis we have chosen a period in the declining phase of solar cycle 23, covering the period 25 January-5 May 2005. During the CIR periods CR decreased typically from 0.5 % to 2 %. A cross-correlation analysis showed a distinct anti-correlation between the magnetic field and CR, with the correlation coefficient (r) ranging from −0.31 to −0.38 (mean: −0.36) and with the CR time delay of 2 to 3 days. Similar anti-correlations were found for the solar wind density and velocity characterized by the CR time lag of 4 and 1 day, respectively. The relationship was also established between the CR modulation and the area of the CIR-related CH with the CR time lag of 5 days after the central-meridian passage of CH.

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“…Yang, Y. Jiang & J. Zhang 3. Full-disk CH SXR images from the GOES-12/SXI (Hill et al 2005). The images cover a wavelength range of 6-65Å (0.9-2.4 MK), with a 6-hr cadence and a 5 pixel size.…”

Section: Observationsmentioning

confidence: 99%

The formation of an equatorial coronal hole

2009

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Abstract. The formation of an equatorial coronal hole (CH) from 2006 January 9 to 12 was simultaneously observed by GOES-12/SXI, SOHO/EIT and SOHO/MDI instruments. The varieties of soft X-ray and EUV brightness, coronal temperature, and total magnetic flux in the CH were examined and compared with that of a quiet-sun (QS) region nearby. The following results are obtained. (1) A preexisting dark lane appeared on the location of the followed CH and was reinforced by three enhanced networks. (2) The CH gradually formed in about 81 hours and was predominated by positive magnetic flux. (3) During the formation, the soft X-ray and EUV brightness, coronal temperature, and total magnetic flux obviously decreased in the CH, but were almost no change in the QS region. The decrease of the total magnetic flux may be the result of magnetic reconnection between the open and closed magnetic lines, probably indicating the physical mechanism for the birth of the CH.

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The NOAA Goes-12 Solar X-Ray Imager (SXI) 1. Instrument, Operations, and Data

Cited by 86 publications

References 17 publications

Large-scale Globally Propagating Coronal Waves

Large-scale Globally Propagating Coronal Waves

Cosmic ray modulation by corotating interaction regions

The formation of an equatorial coronal hole

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