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Only 1/2 solar rotation until the August eclipse!

The NCAR K-Cor coronagraph in Hawaii records artificial eclipse images. The Sun takes 27.3 days to rotate as seen from Earth. The corona usually changes slowly so we can imagine what the eclipse will look like using pictures of the corona taken a few solar rotations before the eclipse. The 1/2 rotation image is flipped left-to-right to make it look like a full solar rotation.

2017-05-31, 3 solar rotations before August eclipse

The NCAR K-Cor coronagraph in Hawaii records artificial eclipse images. The Sun takes 27.3 days to rotate as seen from Earth. The corona usually changes slowly so we can imagine what the eclipse will look like using pictures of the corona taken a few solar rotations before the eclipse. The 1/2 rotation image is flipped left-to-right to make it look like a full solar rotation.

2017-06-27, 2 solar rotations before August eclipse

The NCAR K-Cor coronagraph in Hawaii records artificial eclipse images. The Sun takes 27.3 days to rotate as seen from Earth. The corona usually changes slowly so we can imagine what the eclipse will look like using pictures of the corona taken a few solar rotations before the eclipse. The 1/2 rotation image is flipped left-to-right to make it look like a full solar rotation.

2017-07-25, 1 solar rotation before August eclipse

The NCAR K-Cor coronagraph in Hawaii records artificial eclipse images. The Sun takes 27.3 days to rotate as seen from Earth. The corona usually changes slowly so we can imagine what the eclipse will look like using pictures of the corona taken a few solar rotations before the eclipse. The 1/2 rotation image is flipped left-to-right to make it look like a full solar rotation.

2017-08-08, 1/2 solar rotation before August eclipse

Eclipse Coronal Magnetic Field Prediction by Predictive Science

These images show the expected direction of the Sun's coronal magnetic field during the total solar eclipse on August 21, 2017 based on a model of the solar corona from the Predictive Science, Inc. team (courtesy J. Linker and P. Riley; see: http://www.predsci.com/corona/aug2017eclipse/). The red/blue image and gray/black image show what the Coronal Multi-Channel Polarimeter (CoMP) instrument at MLSO in Hawaii is expected to see on the day of the eclipse. The CoMP instrument takes images of the Sun's corona in polarized light of ionized Iron which allows scientists to determine the direction of the coronal magnetic field (the red/blue image) and how the coronal structures are polarized (the gray/black) image. The lines superposed on both images show the direction of the Sun's magnetic field.

Plane-of-sky magnetic direction
Linear polarization fraction


Understanding the structure and strength of the coronal magnetic field is of primary importance for predicting Space Weather since most forms of solar activity derive their energy from the coronal magnetic field. CoMP records images of the Sun nearly every day. To get the data please visit the MLSO Home Page.

Latest Eclipse Blog Post

Eclipse Instrumentation aboard the Gulfstream V aircraft
August 9, 2017

With the eclipse nary a fortnight away, final instrument testing is gathering pace. A team led by Harvard University PhD student, Jenna Samra, met at NCAR's Research Aviation Facility in Broomfield, Co on Tuesday to perform one of their final tests before the big day.

Recent News

eBook
August 11, 2017

Magnetism defines the complex and dynamic solar corona. It determines the magnetic loop structure that dominates images of the corona, and stores the energy necessary to drive coronal eruptive phenomena and flare explosions.

Publication Highlights

Simulation of GOLD atomic oxygen emissions
August 14, 2017

The NASA Global-scale Observations of the Limb and Disk (GOLD) mission is a dual-channel imaging spectrograph that will be carried on a commercial communications satellite in geostationary orbit. Launch is scheduled for January, 2018.

Minimally processed Stokes spectra are shown for the 709.0 nm region
August 8, 2017

Observational solar physics is entering a new era with the advent of new 1.5 m class telescopes with adaptive optics, as well as the Daniel K. Inouye 4 m telescope which will become operational in 2019. Major outstanding problems in solar physics all relate to the solar magnetic field.

Observed and inverted Stokes spectra
August 8, 2017

The variation of the vector magnetic field along structures in the solar corona remains unmeasured. 

MLSO Latest Images

CoMP Coronal Intensity

The COronal Multi-channel Polarimeter (CoMP) observes the Fe-XIII emission line at 1074.7 nm to measure the coronal magnetic field and obtain plasma density and motion in the low corona from ~1.03 to 1.5 solar radii.

GET CoMP DATA

K-Cor White Light Corona

Designed to study the formation and dynamics of coronal mass ejections and the evolution of the density structure of the low corona, K-Cor records the polarization brightness (pB).

GET K-COR DATA

K-Cor (radially graded filter)

K-Cor image with a normalized radially graded filter (nrgf) to maximize image contrast, especially in the outer field.

These data are ideal for measuring positions of coronal structures such as CMEs and helmet streamers.

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