Other
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsa31a..04m&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SA31A-04
Other
2415 Equatorial Ionosphere, 2439 Ionospheric Irregularities, 2494 Instruments And Techniques
Scientific paper
GPS-LEO radio occultation measurements are an important source of atmospheric and ionospheric state parameter data, particularly in locations not served by incoherent scatter or MST radars. Classical radio occultation theory invokes the assumption of locally spherical symmetry through the Abel transform to invert the refractive index profile, and thus the electron density and other parameters. While it is well-known that departures from spherical symmetry near the tangent point are detrimental to this inversion, the effects of horizontal gradients have not been studied in detail. One source of severe localized electron density gradients are depletions associated with equatorial spread F. These depletions are readily imaged from the ground as dark regions in otherwise bright recombination airglow emissions. Ground-based imaging of these emissions can provide a two-dimensional map of the horizontal gradients in the ionosphere. Thus, exploiting the field-aligned nature of the depletions, airglow images may be extruded along the geomagnetic field to form an approximate three- dimensional representation of the depleted flux tubes. In this study, we present several cases from the COSMIC mission illustrating the effects of horizontal gradients on occultation ray paths that traverse depleted flux tubes. Depleted flux tubes are identified using a narrow-field airglow imager at Cerro Tololo, Chile, operating in a field- aligned viewing geometry.
Makela Jarmo
Miller Ethan S.
Syndergaard Stig
No associations
LandOfFree
Simultaneous Analysis of COSMIC Ionospheric Occultations and Airglow Images During Periods of Equatorial Spread F does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Simultaneous Analysis of COSMIC Ionospheric Occultations and Airglow Images During Periods of Equatorial Spread F, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simultaneous Analysis of COSMIC Ionospheric Occultations and Airglow Images During Periods of Equatorial Spread F will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1036441