First Observations of Large-Scale Wave Structure Using the CERTO Beacon on the C/NOFS Satellite and a Longitudinal Chain of Stations in Pacific Region

Details First Observations of Large-Scale Wave Structure Using the CERTO Beacon on the C/NOFS Satellite and a Longitudinal Chain of Stations in Pacific Region First Observations of Large-Scale Wave Structure Using the CERTO Beacon on the C/NOFS Satellite and a Longitudinal Chain of Stations in Pacific Region

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa22b..04t&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA22B-04

Physics

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

Scientific paper

There is mounting evidence that large-scale wave structure (LSWS), which appears in the bottomside of the evening equatorial F layer, is playing a central role in the development of plasma structure, generically referred to as equatorial spread F (ESF). Although difficult to detect with sensors that probe only a fixed longitude, supporting evidence has come from a steerable incoherent-scatter radar, an ion-density probe on an equatorial-orbiting satellite, and a few signatures in ground-based ionosonde measurements. Most recently, LSWS has been detected in the form of total electron content (TEC) variations, derived from dual-frequency signals transmitted by the CERTO beacon on C/NOFS (Communication/Navigation Outage Forecasting System), a low-inclination orbiting satellite. These first measurements, made from a single equatorial receiving station (Bac Lieu, Vietnam), have shown that LSWS can extend over more than 20 degrees in longitude and occur even before E-region sunset. With an interest in describing the plasma-density distribution (through tomography) over a broader longitudinal sector, three stations were set up this summer to receive the CERTO signals from C/NOFS. The stations are located on Pohnpei, Kosrae, and Majuro, in the central Pacific region. The longitudinal coverage from these stations is 33 degrees (allowing ionospheric penetration points that extend 10 degrees to either side of a station), or about two hours in local time. In addition, an ionosonde and a five-beam 50 MHz radar are being operated on Pohnpei, which will provide complementary information about the post-sunset rise (PSSR) of the F layer, ESF, and the development of backscatter plumes (i.e., plasma bubbles). Hence, measurements from these stations are expected to produce spatial maps of LSWS that extend from well before E-region sunset to times after the PSSR, and development of ESF, if any. Preliminary results from this cluster of sensors in the Pacific region will be presented.

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