Imaging of a Circumsolar Dust Ring Near the Orbit of Venus

Jones, Mark; Bewsher, D.; Brown, D. S.

doi:10.1126/science.1243194

Cited by 52 publications

(28 citation statements)

References 23 publications

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“…This complicates the inversion of the brightness observations and leads to unreliable determinations of the structure and density distribution of the near-Sun dust and its interplay with planets. For example, the existence of a dust-free zone in the inner corona (<4 R s ) due to sublimation, predicted by Russell (1929), has never been proven experimentally and there is only a marginal detection of a planetary dust ring from Helios observations in the Venus orbit, similar to that seen at Earth's orbit (Leinert and Moster 2007;Jones et al 2013). Such shortcomings have significant impact on our understanding of dust-plasma interactions and the interpretation of the evolution of circumstellar dust rings and planet formation.…”

Section: Science Question 8: 'What Is the Dust Environment In The Innmentioning

confidence: 98%

The Wide-Field Imager for Solar Probe Plus (WISPR)

et al. 2015

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mission designed to orbit as close as 7 million km (9.86 solar radii) from Sun center. WISPR employs a 95 • radial by 58 • transverse field of view to image the fine-scale structure of the solar corona, derive the 3D structure of the large-scale corona, and determine whether a dust-free zone exists near the Sun. WISPR is the smallest heliospheric imager to date yet it comprises two nested wide-field telescopes with large-format (2 K × 2 K) APS CMOS detectors to optimize the performance for their respective fields of view and to minimize the risk of dust damage, which may be considerable close to the Sun. The WISPR electronics are very flexible allowing the collection of individual images at cadences up to 1 second at perihelion or the summing of multiple images to increase the signal-to-noise when the spacecraft is further from the Sun. The dependency of the Thomson scattering emission of the corona on the imaging geometry dictates that WISPR will be very sensitive to the emission from plasma close to the spacecraft in contrast to the situation for imaging from Earth orbit. WISPR will be the first 'local' imager providing a crucial link between the large-scale corona and the in-situ measurements.

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Section: Science Question 8: 'What Is the Dust Environment In The Innmentioning

confidence: 98%

The Wide-Field Imager for Solar Probe Plus (WISPR)

et al. 2015

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“…The presence of an enhancement in density of the interplanetary dust (IPD) cloud near the orbit of Venus was suggested by Leinert & Moster (2007) based on a re-analysis of Helios data, and the existence of a circumsolar ring-like structure was confirmed by Jones, Bewsher, Brown (2013) (hereafter JBB) using optical photometry from the STEREO mission. JBB presented a subset of data acquired in 2008 and 2009 that shows a ring-like feature (with a modulation in surface brightness of about 1 percent) on angular scales of several square degrees.…”

Section: Introductionmentioning

confidence: 99%

Mapping the circumsolar dust ring near the orbit of Venus

Jones

Bewsher

Brown

2017

Icarus

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Synoptic images obtained from the HI-2 instrument on STEREO-A and -B between 2007 and 2014 have been used to further investigate the circumsolar dust ring at the orbit of Venus that was reported by Jones, Bewsher, Brown (2013). The analysis is based on high signal-to-noise ratio photometry of the zodiacal light, using data acquired over 10-day intervals, followed by a process of extracting spatial variability on scales up to about 6.5• . The resulting images provide information about the structure of the ring at the location where it is viewed tangentially. We identify 65 usable data sets that comprise about 11 percent of the available HI-2 data. Analysis of these images show that the orientation of the ring appears to be different to that of the orbit of Venus, with an inclination of 2.1• and longitude of ascending node of 68.5• . We map the variation of ring density parameters in a frame of reference that is co-rotating with Venus and find a pattern suggestive of dust in a 3 : 2 orbital resonance.However, the location of the maxima of dust densities is not as expected from theoretical models, and there is some evidence that the dust density distribution in the ring has a pattern speed that differs from the mean motion of Venus.

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“…A dust ring has been found around Venus (Leinert & Moster 2007;Jones et al 2013Jones et al , 2017, similar to the rings around many solar system objects. The initial, perhaps tentative, Helios result of a 2% increase in the dust density just outside the orbit of Venus (Leinert & Moster 2007) was confirmed by the analyses of SECCHI/HI data (Jones et al 2013(Jones et al , 2017. Stenborg et al (2018b) found a similar 3-5% increase in the orbit of Mercury also using SECCHI/HI.…”

Section: Solohi Unique Sciencementioning

confidence: 54%

The Solar Orbiter Heliospheric Imager (SoloHI)

Howard

Vourlidas

Colaninno

et al. 2020

A&A

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Aims. We present the design and pre-launch performance of the Solar Orbiter Heliospheric Imager (SoloHI) which is an instrument prepared for inclusion in the ESA/NASA Solar Orbiter mission, currently scheduled for launch in 2020. Methods. The goal of this paper is to provide details of the SoloHI instrument concept, design, and pre-flight performance to give the potential user of the data a better understanding of how the observations are collected and the sources that contribute to the signal. Results. The paper discusses the science objectives, including the SoloHI-specific aspects, before presenting the design concepts, which include the optics, mechanical, thermal, electrical, and ground processing. Finally, a list of planned data products is also presented. Conclusions. The performance measurements of the various instrument parameters meet or exceed the requirements derived from the mission science objectives. SoloHI is poised to take its place as a vital contributor to the science success of the Solar Orbiter mission.

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Imaging of a Circumsolar Dust Ring Near the Orbit of Venus

Cited by 52 publications

References 23 publications

The Wide-Field Imager for Solar Probe Plus (WISPR)

The Wide-Field Imager for Solar Probe Plus (WISPR)

Mapping the circumsolar dust ring near the orbit of Venus

The Solar Orbiter Heliospheric Imager (SoloHI)

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