Daytime low- and middle-latitude spread-F driven by Rayleigh-Taylor instability during the PPEF events

Details Daytime low- and middle-latitude spread-F driven by Rayleigh-Taylor instability during the PPEF events Daytime low- and middle-latitude spread-F driven by Rayleigh-Taylor instability during the PPEF events

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa52a..07v&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA52A-07

Other

2411 Electric Fields (2712), 2437 Ionospheric Dynamics, 2439 Ionospheric Irregularities, 2441 Ionospheric Storms (7949), 2471 Plasma Waves And Instabilities (2772)

Scientific paper

The possibility of Rayleigh-Taylor (RT) instability of the dayside ionosphere is examined under the condition of a strong prompt penetrating electric field (PPEF). Strong PPEF events have been shown to occur during superstorms with Dst less than -250 nT. These PPEFs have been noted to cause significant electron density redistribution in the ionosphere (the dayside ionospheric superfountain, or DIS). We focus on dynamics of the daytime and postdusk ionosphere at low- and middle latitudes. We present first estimates of the RT instability growth rates based on a modified SAMI-2 model. An electric field value of ~ 4 mV/m is assumed. We find that there are two regions in the daytime ionosphere where the RT instability develops. Bottom-side F-layer instability occurs at the lower portion of the uplifted equatorial ionospheric anomaly (EIA). The corresponding altitude range of instability is between ~500 and 700 km. Another region of instability is below ~150 km altitude. With the addition of the PPEF in the post-dusk sector, the RT growth rates are considerable higher at the bottom-side of the EIAs. Corresponding linear growth time for the RT instability vary from 0.8 minutes to 4 minutes, depending on local time and altitude.

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