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Solar Activity and Interplanetary Medium

Solar activity is usually called the whole set of observed non-stationary phenomena in the solar atmosphere, its radiation in different ranges of electromagnetic waves and fluxes of particles of different energies.

The degree of solar activity is characterized by certain indices, which are calculated from the results of observations on various instruments and give a notion only of part of the complex picture of solar activity.

The interplanetary medium is a matter and fields that fill the space inside the solar system from the solar corona to the boundaries of the heliosphere with the exception of the planets and bodies of the solar system. In the concept of "interplanetary medium" do not include the outer atmospheres of planets (hydrogen extended corona), comets and their remains, the solar corona parts nearest to the Sun, cosmic rays, including solar origin.

The interplanetary medium mainly includes the solar wind, interplanetary magnetic field, cosmic rays (charged particles of high energy), neutral gas, interplanetary dust and electromagnetic radiation. The interplanetary medium plays a key role in solar-terrestrial physics and its practical part - space weather. This term refers to the state of the magnetosphere, ionosphere, troposphere, thermosphere - all layers of near-Earth space at any given time interval, which is determined by the active phenomena on the sun. At present, the term "near-Earth space" means the area beginning with height of 50-60 km from the Earth and extending over a distance of tens of Earth's radii. The substance that fills this area is still more connected with our planet, and not with the Sun or any other astronomical body. It is clear that in this area we are dealing mainly with natural plasma.

The World Data Center for Solar-Terrestrial Physics has an extensive archive of data on solar activity and the interplanetary medium obtained on the world network of solar observatories and stations and in analytical centers.

Sun Spots
The flux of radio emission from the Sun with a wavelength of 10.7 cm (2800 MHz)
Solar flare events
Solar proton events
Cycles of solar activity
The sectoral structure of the interplanetary magnetic field
Data on the Solar Activity and the Interplanetary Medium off-line

Data on the solar activity and the interplanetary medium on the sites of other organizations

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