** Progress in Earth and Planetary Science is the official journal of the Japan Geoscience Union, published in collaboration with its 50 society members.

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    • Progress in Earth and Planetary Science
    Progress in Earth and Planetary Science

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    Equatorial plasma bubble seeding by MSTIDs in the ionosphere

    Takahashi H, Wrasse C M, Figueiredo CAOB, Barros D, Abdu M A, Otsuka Y, Shiokawa K

    Equatorial plasma bubbles, MSTID, Gravity waves

    Plasma bubbles observed by Total Electron Content map over South America on the night of March 8-9, 2015. The black line indicates the geomagnetic equator.

    Occurrences of equatorial plasma bubbles (EPBs) and medium-scale traveling ionospheric disturbances (MSTIDs) were studied using GPS satellite data-based total electron content mapping, ionograms, and 630 nm all-sky airglow images observed over the South American continent during the period of 2014–2015. In many cases, we observed a close relationship between the inter-bubble distance and the horizontal wavelength of the MSTIDs. The MSTIDs followed by EPBs occurred primarily in the afternoon to evening period under strong tropospheric convective activities (cold fronts and/or intertropical convergence zones). The close relationship between EPBs and MSTIDs suggests that MSTIDs could be one of the seeding sources of EPBs.