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Welcome to PMOD center for the nowcast and short-term forecast

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    The nowcast and short-term forecast of the space weather are driven by the different observational data gained recently a lot of attention, because the Solar activity variations are able to induce substantial changes in the Earth environment, which turn out to be important for the space operations, radio-wave propagation, GPS functioning and many other aspects of the mankind activity.  Among other elements of the space weather it is of an interest to understand and predict the response of the neutral and charged compounds in the middle atmosphere to the variability of the Sun activity. An important aspect of this issue is an evaluation and prediction of the response of the middle atmosphere to the solar ultraviolet irradiance variability. The composition and temperature in the middle atmosphere are defined by the photolysis and heating rates, which depend directly on the Sun activity and also by complicated non-linear advective and turbulent transport of the species.

    The center is developed to produce the nowcast and short-term forecast in the middle atmosphere based on observed ultra-violet (UV) irradiance. As the observed UV irradiance we are going to use measurements of LYRA instrument on board of ESA  PROBA-2 satellite and PREMOS instrument on board of French PICARD satellite.
    The LYRA instrument onboard PROBA-2 satellite will provide the solar irradiance for several wavelengths important for the middle atmosphere in real time. LYRA will specifically monitor the solar irradiation in four wavelength bands that are essential for the Sun-Earth connection: Lyman-alpha (115-125 nm), Herzberg (200-220 nm), Zirconium (1-20 nm) and Aluminium (17-70 nm) including He II at 30.4 nm.
    PREMOS will monitor the solar irradiance in two UV channels at 268 nm and in the Herzberg band (215 nm), and in one visual channel at 535 nm and one near IR channel at 782 nm. These data together with solar irradiance measurements available from the SORCE experiment provide a solid basis for the nowcast of the neutral and ion composition of the stratosphere and mesosphere.
    Those data will be used as input data for chemistry-ionosphere-climate model (CICM). To use observed solar irradiance we will reconstruct the whole solar spectrum that model needed. As the proxy for solar spectrum reconstruction we use Lyman alpha and Herzberg continuum measured by LYRA.

Last Updated ( Monday, 11 January 2010 12:26 )  


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