The Relation between Magnetospheric State Parameters and the Occurrence of Night-Time Mid-Latitude Plasma Depletions in the F-Region

Details The Relation between Magnetospheric State Parameters and the Occurrence of Night-Time Mid-Latitude Plasma Depletions in the F-Region The Relation between Magnetospheric State Parameters and the Occurrence of Night-Time Mid-Latitude Plasma Depletions in the F-Region

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa23b1471s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA23B-1471

Physics

[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2439] Ionosphere / Ionospheric Irregularities, [2443] Ionosphere / Midlatitude Ionosphere, [2471] Ionosphere / Plasma Waves And Instabilities

Scientific paper

Recent studies using all-sky imagers have revealed the presence of various ionospheric irregularities in the night-time mid-latitude F-region. The most prevalent and well known of these are the medium scale traveling ionospheric disturbances (MSTIDs) that usually occur when the geomagnetic activity is low, and mid-latitude spread-F plumes (or plasma bubbles) that are observed when the geomagnetic activity is high. The inverse and direct relations between geomagnetic activity (particularly Kp) and the occurrence rate of MSTIDs and mid-latitude plasma bubbles, respectively, have been observed by several studies using different instruments. Although there have been a number of theoretical models proposed for these ionospheric phenomena, most notably the Perkins instability for MSTIDs and the Rayleigh-Taylor instability for spread-F plumes, how the actual physical mechanisms may operate under different geomagnetic activity levels have not yet been firmly established. In order to understand the underlying causes of these two relations, it might be illuminating to better characterize the occurrence of MSTIDs and bubbles using multiple magnetospheric state parameters. Here we statistically compare multiple geomagnetic driver and response parameters (such as solar wind speed and intensity, IMF, Kp, AE, and Dst) with the occurrence rates of night-time MSTIDs and bubbles observed using an all-sky imager at Arecibo Observatory between 2003 and 2008. The results not only allow us to better distinguish MSTIDs and bubbles, but also shed further light on the generation mechanism and electrodynamics of these two different phenomena occurring at night-time in the mid-latitude F-region.

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