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[[File:Solar_wind_Speed_interplanetary_magnetic_field.jpg|Solar wind Speed interplanetary magnetic field|thumb]] [[Image:Birkeland-anode-globe-fig259.jpg|Birkeland-anode-globe-fig259|thumb|left]] [[File:52706main_hstorion_lg.jpg|52706main hstorion lg|thumb|left]] [[File:Magnificent_CME_Erupts_on_the_Sun_-_August_31.jpg|Magnificent CME Erupts on the Sun - August 31|thumb]] [[File:Switchbacks_on_the_Sun.gif|Switchbacks on the Sun|thumb]] [[File:CC_BY_icon.svg|CC BY icon|thumb]] '''Solar wind''' is a stream of [[plasma]] (charged particles) released from the upper atmosphere of the [[Sun]], known as the [[corona]]. This wind consists mainly of [[electron]]s, [[proton]]s, and [[alpha particle]]s with energies usually around 1.5 keV. The solar wind affects the entire [[Solar System]], including [[Earth]] and its [[magnetosphere]], and is a major component of [[space weather]]. It plays a significant role in the shaping of planetary [[atmosphere]]s and the erosion of [[celestial body|celestial bodies']] surfaces over time.

== Origin and Characteristics ==
The solar wind originates from the Sun's corona, where the temperature is so high (millions of degrees) that the Sun's gravity cannot hold onto the heated [[gas]]es. As a result, particles are ejected from the Sun's outer layer and stream outwards at speeds ranging from 250 to 750 kilometers per second. The wind is divided into two main components: the fast solar wind and the slow solar wind. The fast wind is known to originate from coronal holes, which are cooler and less dense regions of the corona, while the origins of the slow wind are less well understood but are thought to be associated with the boundaries of coronal hole regions.

== Interaction with the Solar System ==
The solar wind interacts with the [[magnetic field]]s and atmospheres of the planets, leading to a variety of phenomena. For example, when the solar wind reaches [[Earth]], it can cause [[aurora|auroral]] displays at the polar regions, known as the [[Northern Lights]] (Aurora Borealis) and the [[Southern Lights]] (Aurora Australis). The interaction between the solar wind and Earth's magnetosphere can also lead to disruptions in [[satellite]] communications and [[power grid]]s during intense [[solar storm]]s.

== Measurement and Study ==
The study of the solar wind is a key field in [[space weather]] research and [[heliospheric science]]. Instruments such as [[spacecraft]] and [[satellite]]s, including the [[Parker Solar Probe]] and the [[Solar and Heliospheric Observatory (SOHO)]], have been deployed to measure and analyze the solar wind's properties directly. These missions provide valuable data on the wind's velocity, density, temperature, and composition, contributing to our understanding of the Sun-Earth connection and aiding in the prediction of space weather events.

== Impact on Planetary Systems ==
Beyond Earth, the solar wind has significant effects on other bodies within the Solar System. It can strip away the atmospheres of planets lacking a protective magnetic field, as observed on [[Mars]] and [[Venus]]. The solar wind also contributes to the formation of [[comet]] tails by pushing the cometary material away from the Sun.

== Future Research ==
Ongoing and future missions aim to further our understanding of the solar wind and its interactions with the Solar System. By studying the solar wind, scientists hope to gain insights into stellar wind processes in other [[star]] systems and the potential impact on [[exoplanet]] atmospheres and habitability.

[[Category:Astronomy]]
[[Category:Solar System]]
[[Category:Space weather]]
{{astronomy-stub}}

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