Determination of the Altitude of Cosmic Noise Absorption at Cusp Latitudes Using the Vertical Parallax Technique

Details Determination of the Altitude of Cosmic Noise Absorption at Cusp Latitudes Using the Vertical Parallax Technique Determination of the Altitude of Cosmic Noise Absorption at Cusp Latitudes Using the Vertical Parallax Technique

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa22a0095t&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SA22A-0095

Physics

2407 Auroral Ionosphere (2704), 2435 Ionospheric Disturbances, 2736 Magnetosphere/Ionosphere Interactions

Scientific paper

The overlapping beam patterns of two closely spaced imaging riometers have been used to make direct observations of the altitude of maximum ionospheric absorption of cosmic radio noise. The method employs the simple vertical parallax technique. One drawback of the riometry technique of observing density enhancements in the ionosphere has been its inability to retrieve direct height information regarding precipitation regions from absorption measurements. To obtain absorption height information requires either the application of a multifrequency technique, or coordination of riometer data and data from independent instruments such as iono-digisondes or incoherent scatter radar. The unique proximal location of the Southern Hemisphere Imaging Riometer Experiment \(SHIRE\), located at Davis, Antarctica and the NIPR/STELab imaging riometer at Zhongshan, Antarctica, just 109km away, presents an opportunity to use parallax methods as a means of determining the altitude of Cosmic Noise Absorption in the cusp region, on an event basis. The relative fields of view of the two instruments have near optimal overlap for the application of parallax methods of this kind, with overlapping beams at any altitude above 40km. Using this new technique, we confirm the altitude of maximum radiowave absorption at between 90 and 100km \(ionospheric D region\) for auroral zone precipitation on the nightside, indicating precipitation of magnetospheric electrons >10keV in energy. We also report on the observation of riometer absorption events occurring in the ionospheric E and F regions. Studies of auroral absorption events with multiple enhancements show that the altitude at which individual enhancements occur may vary significantly. This is reflected in the variation of the peak absorption level for each enhancement.

Affiliated with

Also associated with

No associations

Rating

Determination of the Altitude of Cosmic Noise Absorption at Cusp Latitudes Using the Vertical Parallax Technique 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 Determination of the Altitude of Cosmic Noise Absorption at Cusp Latitudes Using the Vertical Parallax Technique, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Determination of the Altitude of Cosmic Noise Absorption at Cusp Latitudes Using the Vertical Parallax Technique will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1641717