On Equatorial Spread F During the Solstices Under Solar Minimum Conditions

Details On Equatorial Spread F During the Solstices Under Solar Minimum Conditions On Equatorial Spread F During the Solstices Under Solar Minimum Conditions

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa41c..09t&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA41C-09

Other

[2415] Ionosphere / Equatorial Ionosphere, [2427] Ionosphere / Ionosphere/Atmosphere Interactions, [2439] Ionosphere / Ionospheric Irregularities, [2471] Ionosphere / Plasma Waves And Instabilities

Scientific paper

There is mounting evidence that large-scale wave structure (LSWS), seeded by atmospheric gravity waves (AGWs) from the troposphere, is playing an important role in the development of plasma structure, generically referred to as equatorial spread F (ESF) [Tsunoda, 2010a,b,c]. The process involves neutral-ion coupling via polarization of the spatially-divergent Pedersen current, which is associated with zonally propagating AGWs, but only by AGWs excited along the magnetic dip equator. Hence, ESF via seeding of LSWS by AGWs is strongest, when the intertropical convergence zone (ITCZ) becomes aligned with the magnetic dip equator [Tsunoda, 2010a]. In this presentation, we show that the validity of what we have referred to as the GWBA (gravity wave-B alignment) hypothesis, where B is the geomagnetic field, becomes most evident during the solstices under solar minimum conditions. We focus here on the interpretation of enhanced ESF activity, which occurs in the Brazilian sector during the June solstice. We show that this feature, which dominated the dawn ESF climatology during 2008, appears to involve seeding, as described above, but must involve other drivers, such as an effective neutral wind in the thermosphere and coupled polarization behavior, which occurs in the presence of a sporadic-E layer [e.g., Tsunoda, 2009]. The dawn ESF climatology used in this presentation is from the DMSP satellite.

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