Planned obsolescence, a one-way trip, will be the demise of the Parker Solar Probe. It will burn up. But that’s ok; it’s all part of the plan. NASA’s probe will collect information on the Sun’s corona. The information to be gathered and beamed back to Earth is important to our understanding of solar processes.
The probe will make 24 orbits of the Sun over seven years. In its final seven orbits the probe will swing out past Venus and then slingshot back in towards the Sun to descend further through the heat of the Sun’s corona on each of its final orbits. Eventually it will pass within 3.8 million miles of the Sun’s surface.
The corona is the upper layer of the Sun’s atmosphere, extending millions of miles beyond the visible surface of the Sun, the photosphere. Photons released by nuclear fusion deep in the interior of the Sun are emitted by the photosphere, giving light. The corona lies millions of miles above this but is curiously hotter than the Sun’s surface. Solar winds generated in the polar and equatorial regions of the Sun lash out from the corona and send massive amounts of electrically charged particles streaming away from the Sun. These winds and other solar activities are the solar weather which reaches across the 93 million miles between the Earth and the Sun and can cause havoc on Earth. The particles of the solar wind travel at speeds over one million miles per hour and can cover the distance between the Sun and the Earth in about ten days. This is much slower than the light from the Sun which can cover that distance in about eight minutes.
The most visible aspect of the solar winds is the generation of aurora, curtains of glowing colors of light, that appear near the Earth’s magnetic poles. In the northern hemisphere, these displays are often called Northern Lights. They shimmer in the Earth’s upper atmosphere when the particles of the solar wind hit the lines of the Earth’s magnetic field. The strongest of these solar winds can also destroy the electronic capability of satellites. The winds can wipe out power grids on the Earth’s surface plunging cities into blackouts which can last for days. When the bursts of energy that generate the solar winds are detected, warnings can be made so that delicate equipment can be turned off or otherwise protected. Life on Earth is protected from the charged particles of the solar wind by the Earth’s own magnetic field. But astronauts above the Earth, or perhaps on a mission to Mars, or living on the moon, are not protected from the massive stream of charged particles.
The Parker Solar Probe is helping us to develop a deeper understanding of the fundamental processes of the Sun. By studying the data received from the probe, we will be able to better forecast solar weather and protect life and property. This knowledge will also provide important information regarding how to protect astronauts when we go out to build colonies off Earth.
Recently the probe reached a milestone on it mission; it began its second orbit of the sun. Important data has already been sent by the probe and received by NASA scientists. On the second orbit, protected by its 4.5 inch carbon-composite solar shield, the probe will pass within 15 million miles of the Sun’s surface. It will go deeper. With each orbit it will transmit more data on the solar wind, and it will continue to find information related to solar eruptions which accelerate particles dangerous speeds, and will plumb the mystery of why the corona is several 100’s of time hotter than the surface of the Sun. The probe will descend deeper and deeper into the heat to discover the depths of the plasma of the Sun’s corona.
These are the golden apples of the Sun, to gain knowledge, to know, to understand.
The picture is based on NASA imagery.
Information on the Parker Solar Probe found at https://www.nasa.gov/sites/default/files/atoms/files/parkersolarprobe_presskit_august2018_final.pdf .
Golden Apples of the Sun based on collection of Ray Bradbury stories of that name and from W.B. Yeats The Song of Wandering Aengus