The data recived from ACE satellite. The Advanced Composition Explorer (ACE) is an Explorer mission that was managed by the Office of Space Science Mission and Payload Development Division of the National Aeronautics and Space Administration (NASA). ACE launched on a McDonnell-Douglas Delta II 7920 launch vehicle on August 25, 1997 from the Kennedy Space Center in Florida. The spacecraft has enough propellant on board to maintain an orbit at L1 until ~2024. ACE orbits the L1 libration point which is a point of Earth-Sun gravitational equilibrium about 1.5 million km from Earth and 148.5 million km from the Sun. ACE provides near-real-time 24/7 continuous coverage of solar wind parameters and solar energetic particle intensities (space weather).

More on the ACE personnel, including scientific Co-Investigators can be found here.

This monitor provides magnetopause stand-off distance (geocentric distance to the magnetopause subsolar point, R_ss) calculated in accordance with the [Shue et al., 1998] model:

Also there is a database of subsolar point calculated in accordance with the [Kuznetsov-Suvorova, 1998] model:

B_z [nT] (interplanetary magnetic field z-component is GSM coordinates) and P [nPa] (solar wind dynamic pressure) are measured by ACE spacecraft at UT_ACE time instant.

Highlighted rows in the source data table indicate the solar wind conditions that are estimated to be bound to the Earth's magnetosphere at current UT=20:57. The corresponding magnetopause stand-off distance overage value is R_ss=DB fails

Special thanks to the ACE team (http://www.sec.noaa.gov/ace/) for providing real-time solar wind and magnetic field data.

Magnetopause stand-off distance calculated using solar wind data measured by ACE spacecraft