Could Post-Sunset Ionospheric Irregularities be Predicted Using OI 630.0nm Daytime Airglow?

Details Could Post-Sunset Ionospheric Irregularities be Predicted Using OI 630.0nm Daytime Airglow? Could Post-Sunset Ionospheric Irregularities be Predicted Using OI 630.0nm Daytime Airglow?

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52c08c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA52C-08

Physics

0310 Airglow And Aurora, 0355 Thermosphere--Composition And Chemistry, 0394 Instruments And Techniques

Scientific paper

Although there is a broad understanding of the Equatorial Spread F (ESF) generation mechanism and their occurrence morphology, there exists an uncertainty in their day-to-day occurrence. Even in the so-called `ESF season' when the ionospheric and thermospheric conditions on different days are similar, the ESF occurrence cannot be predicted with confidence. Scientifically, this is an important missing element in our understanding of plasma instabilities at low latitudes and from a societal viewpoint its importance cannot be overstated. Using ground-based ionosonde measurements Raghavarao and colleagues demonstrated the existence of a precursor to the ESF in terms of the Appleton anomaly development. They proposed that the strong development of the daytime Appleton anomaly seems to 'prepare' the ionosphere for the ESF. Subsequently, Sridharan, Pallamraju and colleagues used 630.0nm atomic oxygen dayglow emissions to follow the evolution of the Appleton anomaly over a wide latitude range from a single location. We have developed a high-resolution imaging spectrograph called HIRISE (High Resolution Imaging Spectrograph using Echelle grating), capable of making daytime optical measurements from ground. HIRISE has been successfully used to obtain the first ever ground based measurements of daytime cusp in OI 630.0nm (Pallamraju et al., These Proceedings). In this talk we will report on a campaign we undertook during the ESF season in Chile. The primary purpose of this experiment was to explore the relationship between OI 630.0nm morphology and ESF development. We compared predictions of ESF occurrence based on our optical data with independent ground based HF Radar observations for 18 days when both measurements were available. Our results, obtained at larger latitude coverage than the Indian measurements, appear to support the previous results although, significant differences remain.

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