What are Sun Clocks?

The corona refers to the outermost layer of the sun's atmosphere (the inside is the chromosphere and the photosphere), with a thickness of several million kilometers or more. Outside the chromosphere is the corona, which is extremely hot, with a corona temperature of 1 million degrees Celsius and a particle number density of 10 ¹⁵ / m ³ .

Corona is

Corona radiation has a wide range of wavelengths, from

radiation

The corona radiation is generated in a non-local thermodynamic equilibrium state, which has the following situations: The free electrons scattered in the corona gas scatter photosphere radiation, that is, the white light corona. Electron homoprotons, alpha particles and various

The temperature of the corona is very high, reaching 2 million degrees. Incredibly, the closest to the center of the sun

From the perspective of magnetohydrodynamics, the magnetic field in the solar atmosphere should be a unified whole, that is, the corona magnetic field is closely related to the photosphere magnetic field and the chromosphere magnetic field. Coronal large-scale non-uniform structures seen in corona photos: coronal flow,

According to foreign media reports, NASA plans to launch the latest detector on July 31, 2018, which will approach the sun at an unprecedented close range. The space program, called the Solar Probe Plus, will carry out four experiments on the solar corona, studying the solar wind and energy particles released from the sun's surface.

During the close proximity to the sun, the closest distance between the detector and the sun is 6.11 million kilometers, and its external temperature will reach 1399 degrees Celsius. It is reported that according to the original plan, this probe will be launched from Cape Canaveral Air Force Base, Florida by a Delta 4 heavy rocket on July 31, 2018, and the launch time window will open for 20 days.

Scientists have long hoped that launching probes would pass through the solar corona (the outermost layer of the solar atmosphere) to better understand the solar wind and the materials that enter the solar system. The main scientific tasks of the solar probe's additional tasks are to track the flow of solar energy, understand the heating of the solar corona, and explore the physical principles that promote solar wind and energy particle activity. ^[6]