Near-Sun observations of an F-corona decrease and K-corona fine structure

  title={Near-Sun observations of an F-corona decrease and K-corona fine structure},
  author={Russell A. Howard and Angelos Vourlidas and V. Bothmer and R. C. Colaninno and Craig E. DeForest and Brendan Gallagher and J R Hall and Phillip C. Hess and Aleida K. Higginson and Clarence M. Korendyke and A. Kouloumvakos and Philippe Lamy and Paulette C. Liewer and Jon A. Linker and M. G. Linton and Paulo Fernando Penteado and Simon P. Plunkett and Nicolas Poirier and Noureddine Raouafi and Nathan Rich and Pierre P. Rochus and Alexis P. Rouillard and Dennis George Socker and Guillermo Stenborg and Arnaud F. R. Thernisien and Nicholeen, Mary Viall},
Remote observations of the solar photospheric light scattered by electrons (the K-corona) and dust (the F-corona or zodiacal light) have been made from the ground during eclipses1 and from space at distances as small as 0.3 astronomical units2–5 to the Sun. Previous observations6–8 of dust scattering have not confirmed the existence of the theoretically predicted dust-free zone near the Sun9–11. The transient nature of the corona has been well characterized for large events, but questions still… 
The Color and Brightness of the F-corona Inferred from the 2019 July 2 Total Solar Eclipse
Total solar eclipses (TSEs) provide a unique opportunity to quantify the properties of the K-corona (electrons), F-corona (dust), and E-corona (ions) continuously from the solar surface out to a few
Model Calculations of the F-Corona and inner Zodiacal Light
The white-light Fraunhofer corona (F-corona) and inner Zodiacal light are generated by interplanetary (Zodiacal) dust particles that are located between Sun and observer. At visible wavelength the
PSP/WISPR Observations of Dust Density Depletion near the Sun. II. New Insights from within the Depletion Zone
Visible light observations from the Wide-field Imager for Solar PRobe (WISPR) aboard the Parker Solar Probe (PSP) mission offer a unique opportunity to study the dust environment near the Sun. The
The Sun’s dynamic extended corona observed in extreme ultraviolet
The “middle corona” is a critical transition between the highly disparate physical regimes of the lower and outer solar corona. Nonetheless, it remains poorly understood due to the difficulty of
Effect of Dust Rotational Disruption by Radiative Torques and Implications for the F-corona Decrease Revealed by the Parker Solar Probe
The first-year results from the Parker Solar Probe (PSP) reveal a gradual decrease of F-coronal dust from distances of D = 0.166–0.336 au (or the inner elongations of ∼9.22–18.69 R ⊙) to the Sun.
In Situ Observations of Interplanetary Dust Variability in the Inner Heliosphere
This work examines the variation of interplanetary dust count rates and directionality during the first three solar encounters made by the Parker Solar Probe spacecraft, covering distances between
Understanding the origins of the heliosphere: integrating observations and measurements from Parker Solar Probe, Solar Orbiter, and other space- and ground-based observatories
Context. The launch of Parker Solar Probe (PSP) in 2018, followed by Solar Orbiter (SO) in February 2020, has opened a new window in the exploration of solar magnetic activity and the origin of the
Dynamics of the charged particles released from a Sun‐grazing comet in the solar corona
The sun‐grazing comet C/2011 W3 (Lovejoy) showed a distorted, unconventional tail morphology near its perihelion (1.2Rs). Based on the “Solar Corona and Inner Heliosphere” modeling result of the
The Solar Origin of Particle Events Measured by Parker Solar Probe
During the second solar encounter phase of Parker Solar Probe (PSP), two small solar energetic particle (SEP) events were observed by the Integrated Science Investigation of the Sun, on 2019 April 2
Pristine PSP/WISPR Observations of the Circumsolar Dust Ring near Venus's Orbit
The Parker Solar Probe mission (PSP) has completed seven orbits around the Sun. The Wide-field Imager for Solar Probe (WISPR) on PSP consists of two visible light heliospheric imagers, which together


No Evidence of a Circumsolar Dust Ring from Infrared Observations of the 1991 Solar Eclipse
Results are reported from an experiment conducted on Mauna Kea with a HgCdTe-array detector sensitive to wavelengths between 1 and 2.5 micrometers, using broad-band J, H, and K filters, which clearly show the inhomogeneous structure in the K-corona and the elliptical flattening of the F- Corona, but no evidence of a circumsolar, local dust component out to 15 solar radii.
Dust Near The Sun
We review the current knowledge and understanding of dust in the inner solar system. The major sources of the dust population in the inner solar system are comets and asteroids, but the relative
The outer solar corona as observed from Skylab - Preliminary results
The white-light coronagraph experiment has made frequent, periodic observations of the solar corona from 1.5 to 6.0 solar radii during the Skylab mission, and these observations will permit the
Multi-Spacecraft Observations of Solar Flare Particles in the Inner Heliosphere
For a number of impulsive solar particle events we examine variations of maximum intensities and times to maximum intensity as a function of longitude, using observations from the two Helios
A study of the background corona near solar minimum
The white light coronagraph data from Skylab is used to investigate the equatorial and polarK andF coronal components during the declining phase of the solar cycle near solar minimum. Measurements of
A solar storm observed from the Sun to Venus using the STEREO, Venus Express, and MESSENGER spacecraft
The suite of SECCHI optical imaging instruments on the STEREO-A spacecraft is used to track a solar storm, consisting of several coronal mass ejections (CMEs) and other coronal loops, as it
A Heuristic Approach to Remove the Background Intensity on White-light Solar Images. I. STEREO/HI-1 Heliospheric Images
White-light coronal and heliospheric imagers observe scattering of photospheric light from both dust particles (the F-Corona) and free electrons in the corona (the K-corona). The separation of the
Alfvénic velocity spikes and rotational flows in the near-Sun solar wind
Observations of solar-wind plasma at heliocentric distances of about 35 solar radii reveal an increasing rotational component to the flow velocity of the solar wind around the Sun, peaking at 35 to 50 kilometres per second—considerably above the amplitude of the waves.
The Highly Structured Outer Solar Corona
We report on the observation of fine-scale structure in the outer corona at solar maximum, using deep-exposure campaign data from the Solar Terrestrial Relations Observatory-A (STEREO-A)/COR2
Characterization of the White-light Brightness of the F-corona between 5° and 24° Elongation
The white-light F-corona arises from light scattered by circumsolar dust. Using weekly models of the eastern side of the F-corona between 5° and 24° elongation, we analyzed the elongation and time