Range Spread- F over the Southern Anomaly Crest during Solar Minimum Activity

Details Range Spread- F over the Southern Anomaly Crest during Solar Minimum Activity Range Spread- F over the Southern Anomaly Crest during Solar Minimum Activity

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa51b1628c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA51B-1628

Other

[2400] Ionosphere, [2415] Ionosphere / Equatorial Ionosphere, [2435] Ionosphere / Ionospheric Disturbances, [2439] Ionosphere / Ionospheric Irregularities

Scientific paper

In this work we present a study of a series of range spread-F events observed over the southern anomaly crest at Cachoeira Paulista (22.7oS, 45.0 o W, mag lat: 16 o S, dip angle: -22.3o), Brazil, during June solstice months, during the last very extended solar minimum period. At Brazilian low latitudes, the spread-F as seen by ionosondes or imaging systems is mostly associated with equatorial plasma bubbles (EPBs), mainly between October and March. On the other hand, during low solar activity and the June solstice periods, the observation of EPBs at low latitude sites is very rare, mainly because the inexpressive equatorial vertical drift at sunset times, except during disturbed periods. It is well known that the vertical drift is one of the most important driver for the development of EPBs, which rise to high altitudes at the equator and map to higher latitudes, along the magnetic field lines. Analyzing a digital ionosonde database obtained during the solar cycle 23, we have observed that the occurrence of spread-F at this station is frequently observed at midnight/post-midnight local times mainly during the solar minimum period. By inspection of the digital ionosonde data obtained at equatorial site, Sao Luiz (2.33o S, 44.2o W, mag lat 1.6o S, dip angle: -2.7o) e airglow optical imaging we verified that the spread-F manifestations over Cachoeira Paulista are not associated with EPBs but to other ionospheric disturbances. We discuss its most remarkable features.

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