Here's a breakdown:

* Early Theories: In the early 1900s, scientists like L. Birkeland and F.A. Lindemann speculated about a flow of charged particles emanating from the sun.

* Parker's Prediction: Eugene Parker, a young astrophysicist, developed a mathematical model in 1958 that predicted the existence of a supersonic solar wind. His theory was initially met with skepticism from the scientific community.

* Confirmation: In 1962, the *Mariner 2* spacecraft measured the solar wind directly, confirming Parker's prediction.

Therefore, while others had ideas about a solar wind, Eugene Parker is considered the discoverer due to his theoretical prediction and the subsequent confirmation by spacecraft measurements.