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  • We know that Sun is a ball of hot plasma, which continuously emits energetic charged particles in the form of solar wind (200-800 km/s). These charged particles are deflected by the Earth’s magnetic field but some of these particles can enter the Earth’s magnetosphere from Polar regions, where magnetic field lines are open and also from magnetotail region through the process of reconnection. These particles get trapped in the geomagnetic field lines and perform three motions: Gyro Motion, Bounce Motion, and Drift Motion.
    Speaker - Ayushi Srivastava (IIG) | Date & Time - 20/05/2022, 17.00 | Venue - IIG Lecture Hall

  • The ionosphere is a region of the earth’s upper atmosphere where neutral air is ionized by solar photons and cosmic rays.HF radio waves travelling through ionosphere interact with the free electrons present there and are bent back towards the surface of earth. Due to these reflections from ionosphere the radio signals are able to travel longer distances. Although today, satellites are widely used, HF radio communications using the ionosphere still play a major role in providing worldwide radio coverage.
    Speaker -  Ankita Manjrekar(IIG) | Date & Time - 20/05/2022, 16.00 | Venue - IIG Lecture Hall

  • Speaker - Gayathri.B (Indian Institute of Geomagnetism)
    A study carried out on the occurrence of pre-midnight and midnight spread F events at an equatorial station Tirunelveli (8.70N, 77.70 E) equipped with Digital ionosonde (CADI).The ionogram data obtained from the ionosonde has been used for identifying the midnight spread F events and also associated temporal variation of virtual height and frequency during the summer solstice. The percentage occurrence of May solstice is analyzed and more ESF occurrence are observed between 12:00 IST – 01.30 IST unlike equinox where ESF is seen predominately in the post sunset. The observations are discussed on the premidnight occurrence F region irregularities in the summer of solar minimum condition.
    Time & date...

  • Speaker - Amrutha (Indian Institute of Geomagnetism)
    Kinetic dispersion relation of magnetosonic waves in magnetised plasma system with a single species Maxwellian distributed ions and electrons will be discussed. The dielectric tensor for the system is derived using kinetic theory starting from the Vlasov equation along with Maxwell equations. The complex dispersion relation of magnetosonic wave is derived using the geometry of the wave. The real frequency and growth rate of magnetosonic wave is calculated from the kinetic dispersion relation. The results are compared with the fluid approach in the absence of temperature anisotropy at appropriate limits.

    Time & date: 16:00, 06 May 2022   |   Venue: Lecture Hall


    21 - 25 February 2022  
    A Virtual Event
    Hosted by Indian Institute of Geomagnetism (IIG)