The SOHO Mission: An Overview

Domingo, V.; Fleck, B.; Poland, A. I.

doi:10.1007/978-94-009-0191-9_1

Cited by 197 publications

(136 citation statements)

References 8 publications

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“…The analyzed dataset is based on Solar and Heliospheric Observatory (SOHO)/ Michelson Doppler Imager (MDI) images (Domingo, Fleck, and Poland, 1995;Scherrer et al, 1995), and consists of extracted subfields from full-disk MDI magnetograms, centered on active-regions present on the disk. Full details of the method of extraction and correction can be found in McAteer, .…”

Section: Magnetic Flux Datamentioning

confidence: 99%

Multiresolution Analysis of Active Region Magnetic Structure and its Correlation with the Mount Wilson Classification and Flaring Activity

et al. 2008

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Two different multiresolution analyses are used to decompose the structure of active region magnetic flux into concentrations of different size scales. Lines separating these opposite polarity regions of flux at each size scale are found. These lines are used as a mask on a map of the magnetic field gradient to sample the local gradient between opposite polarity regions of given scale sizes. It is shown that the maximum, average and standard deviation of the magnetic flux gradient for α, β, βγ and βγδ active regions increase in the order listed, and that the order is maintained over all length-scales. Since magnetic flux gradient is strongly linked to active region activity, such as flares, this study demonstrates that, on average, the Mt. Wilson classification encodes the notion of activity over all length-scales in the active region, and not just those length-scales at which the strongest flux gradients are found. Further, it is also shown that the average gradients in the field, and the average length-scale at which they occur, also increase in the same order. Finally, there are significant differences in the gradient distribution, between flaring and nonflaring active regions, which are maintained over all length-scale. It is also shown that the average gradient content of active regions that have large flares (GOES class 'M' and above) is larger than that for active regions containing flares of all flare sizes; this difference is also maintained at all length-scale. All the reported results are independent of the multiresolution transform used. The implications for the Mt. Wilson classification of active regions in relation to the multiresolution gradient content and flaring activity are discussed.

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Section: Magnetic Flux Datamentioning

confidence: 99%

Multiresolution Analysis of Active Region Magnetic Structure and its Correlation with the Mount Wilson Classification and Flaring Activity

et al. 2008

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“…An exception is made for the Solar and Heliospheric Observatory (SOHO: Domingo, Fleck, and Poland, 1995), which is in a halo orbit about Earth's L 1 Lagrange point. Unfortunately, SOHO FITS files do not contain any ephemeris information in their headers, so when confronted with a FITS header from SOHO, fitshead2wcs will first try to find the appropriate SOHO ephemeris file.…”

Section: Application To Non-stereo Datamentioning

confidence: 99%

Use of the FITS World Coordinate System by STEREO/SECCHI

Thompson

Wei

2009

Sol Phys

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The World Coordinate System (WCS) is a standard for embedding coordinate information in a Flexible Image Transport System (FITS) header. Its first extensive use within solar physics is by the Sun Earth Connections Coronal and Heliospheric Investigation (SEC-CHI) telescope suite onboard the Solar Terrestrial Relations Observatory (STEREO). The WCS formalism assists in SECCHI data analysis in several ways: First of all, the spherical effects associated with the extremely wide fields-of-view of the Heliospheric Imager (HI) telescopes can be handled in a completely unambiguous and standard fashion. Of particular importance is that WCS positional keywords allow spacecraft-ephemeris information to be embedded within the FITS header without depending on mission-specific keywords. Ephemeris data is critical to the three-dimensional analysis that the STEREO mission is designed for. We also show how the WCS software in SolarSoft can be used to relate STEREO data to other missions such as the Solar and Heliospheric Observatory (SOHO). The ability of WCS to support a parallel celestial right ascension (R.A.)/declination (Dec) coordinate system and the use of WCS for COR1 synoptic maps are also discussed. The advantages that STEREO derived from WCS can equally be applied to other solar missions, in particular Solar Orbiter, and should be adopted by all future missions.

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“…The primary data sources for that analysis were space-based instruments (Skylab, Helios, Solwind, and SMM). Since the launch of SOHO in late 1995 (e.g., Domingo, Fleck, and Poland, 1995) the LASCO coronagraphs (Brueckner et al, 1995) have provided a nearly continuous measure of CME activity to the present date. Therefore the only remaining gap in the CME record since the early 1970s has been the period from late-1989 to early-1996.…”

Section: Introductionmentioning

confidence: 99%

MLSO Mark III K-Coronameter Observations of the CME Rate from 1989 – 1996

et al. 2015

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We report here an attempt to fill the 1990 -1995 gap in the CME rate using the Mauna Loa Solar Observatory's Mark III (Mk3) K-coronameter. The Mk3 instrument observed routinely several hours most days beginning in 1980 until it was upgraded to Mk4 in 1999. We describe the statistical properties of the CMEs detected during 1989 -1996, and we determine a CME rate for each of those years. Since spaceborne coronagraphs have more complete duty cycles than a ground-based instrument at a single location, we compare the Mk3-derived CME rate from 1989 with the rate from the SMM C/P coronagraph, and from 1996 with the rate from the SOHO LASCO coronagraphs.

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The SOHO Mission: An Overview

Cited by 197 publications

References 8 publications

Multiresolution Analysis of Active Region Magnetic Structure and its Correlation with the Mount Wilson Classification and Flaring Activity

Multiresolution Analysis of Active Region Magnetic Structure and its Correlation with the Mount Wilson Classification and Flaring Activity

Use of the FITS World Coordinate System by STEREO/SECCHI

MLSO Mark III K-Coronameter Observations of the CME Rate from 1989 – 1996

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