An Algorithm For Determining The Boundary Of Auroral Precipitation Using Data From The Ssj 3 Sensor PDF Download
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Author | : David A. Hardy |
Publisher | : |
Total Pages | : 42 |
Release | : 1980 |
Genre | : Algorithms |
ISBN | : |
Download An Algorithm for Determining the Boundary of Auroral Precipitation Using Data from the SSJ/3 Sensor Book in PDF, ePub and Kindle
In support of the Global Weather Central of the Air Weather Service, we have developed computer techniques to determine, in near real time, the equatorward boundary of the auroral oval using the data from the SSJ/3 sensors flown on board the DMSP satellites. The boundary is determined on both the morning and evening sides of the oval and in both northern and southern auroral zones. Three tests are used in the boundary determination, one on the evening side and two on the morning side of the auroral oval. On the evening side of the auroral zone, since low energy particles always are observed at the lowest latitude, the boundary is determined by testing the summed counts in the six channels of the SSJ/3 detector covering the energy range from 110 eV to 1000 eV. The boundary is chosen when the summed counts exceed 30 for 3 successive seconds. The data are always tested as a function of increasing magnetic latitude. On the morning side, high energy electrons are always observed first. Since the channels measuring high energy electrons may be contaminated by penetrating particles from the ring belts, two tests are required. The first test picks the boundary at the point where three successive ratios of 4-sec averages of channel 8 to channel 9 are less than 5. The second test chooses the boundary where the ratio of the summed counts in channels 1 through 4 of the SSJ/3 sensor to channels 5 through 8 exceeds 1.5 or is less than 0.5 for 3 successive seconds.
Author | : David A. Hardy |
Publisher | : |
Total Pages | : 0 |
Release | : 1980 |
Genre | : Algorithms |
ISBN | : |
Download An Algorithm for Determining the Boundary of Auroral Precipitation Using Data from the SSJ/3 Sensor Book in PDF, ePub and Kindle
In support of the Global Weather Central of the Air Weather Service, we have developed computer techniques to determine, in near real time, the equatorward boundary of the auroral oval using the data from the SSJ/3 sensors flown on board the DMSP satellites. The boundary is determined on both the morning and evening sides of the oval and in both northern and southern auroral zones. Three tests are used in the boundary determination, one on the evening side and two on the morning side of the auroral oval. On the evening side of the auroral zone, since low energy particles always are observed at the lowest latitude, the boundary is determined by testing the summed counts in the six channels of the SSJ/3 detector covering the energy range from 110 eV to 1000 eV. The boundary is chosen when the summed counts exceed 30 for 3 successive seconds. The data are always tested as a function of increasing magnetic latitude. On the morning side, high energy electrons are always observed first. Since the channels measuring high energy electrons may be contaminated by penetrating particles from the ring belts, two tests are required. The first test picks the boundary at the point where three successive ratios of 4-sec averages of channel 8 to channel 9 are less than 5. The second test chooses the boundary where the ratio of the summed counts in channels 1 through 4 of the SSJ/3 sensor to channels 5 through 8 exceeds 1.5 or is less than 0.5 for 3 successive seconds.
Author | : David A. Hardy |
Publisher | : |
Total Pages | : 42 |
Release | : 1980 |
Genre | : |
ISBN | : |
Download An Algorithm for Determining the Boundary of Auroral Precipitation Using Data from the SSJ/3 Sensors Book in PDF, ePub and Kindle
In support of the Global Weather Central of the Air Weather Service, we have developed computer techniques to determine, in near real time, the equatorward boundary of the auroral oval using the data from the SSJ/3 sensors flown on board the DMSP satellites. The boundary is determined on both the morning and evening sides of the oval and in both northern and southern auroral zones. Three tests are used in the boundary determination, one on the evening side and two on the morning side of the auroral oval. On the evening side of the auroral zone, since low energy particles always are observed at the lowest latitude, the boundary is determined by testing the summed counts in the six channels of the SSJ/3 detector covering the energy range from 110 eV to 1000 eV. The boundary is chosen when the summed counts exceed 30 for 3 successive seconds. The data are always tested as a function of increasing magnetic latitude. On the morning side, high energy electrons are always observed first. Since the channels measuring high energy electrons may be contaminated by penetrating particles from the ring belts, two tests are required. The first test picks the boundary at the point where three successive ratios of 4-sec averages of channel 8 to channel 9 are less than 5. The second test chooses the boundary where the ratio of the summed counts in channels 1 through 4 of the SSJ/3 sensor to channels 5 through 8 exceeds 1.5 or is less than 0.5 for 3 successive seconds.
Author | : |
Publisher | : |
Total Pages | : 1132 |
Release | : 1980 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author | : |
Publisher | : |
Total Pages | : 416 |
Release | : 1980-07 |
Genre | : Science |
ISBN | : |
Download Government Reports Announcements & Index Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 228 |
Release | : |
Genre | : Science |
ISBN | : |
Download Technical Abstract Bulletin Book in PDF, ePub and Kindle
Author | : M. S. Gussenhoven |
Publisher | : |
Total Pages | : 214 |
Release | : 1982 |
Genre | : Atmospheric electricity |
ISBN | : |
Download 1978 Diffuse Auroral Boundaries and a Derived Auroral Boundary Index Book in PDF, ePub and Kindle
DMSP/F2 and F4 precipitating electron data are used to determine statistically the systematic variations of the equatorward boundary with Kp as a function of local time. The boundaries were chosen by hand for every DMSP/F2 satellite pass in 1978. These in turn are used to assess an algorithm developed to choose the boundaries automatically. From the statistical variations each boundary is projected to a midnight boundary. The projected midnight boundary served as an index of auroral activity-the Auroral Boundary Index. Listing of the 1978 hand- and computer-chosen boundaries and the Auroral Boundary Index for 1978 are included in appendices.
Author | : Technology Reports Centre (Great Britain) |
Publisher | : |
Total Pages | : 544 |
Release | : 1980 |
Genre | : |
ISBN | : |
Download R & D Abstracts Book in PDF, ePub and Kindle
Author | : David A. Hardy |
Publisher | : |
Total Pages | : 64 |
Release | : 1984 |
Genre | : Auroras |
ISBN | : |
Download Precipitating Electron and Ion Detectors (SSJ/4) for the Block 5D/flights 6-10 DMSP Satellites Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 504 |
Release | : 1988 |
Genre | : Radio meteorology |
ISBN | : |
Download Radio Science Book in PDF, ePub and Kindle