Improving Fof2 Prediction For The Sunrise Transition Period

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Improving Fof2 Prediction For The Sunrise Transition Period

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Author : B. S. Dandekar
language : en
Publisher:
Release Date : 1986

Improving Fof2 Prediction For The Sunrise Transition Period written by B. S. Dandekar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Ionospheric forecasting categories.

During the 2- to 3-hr sunrise transition period, the relative change in foF2 is 20-60 percent per hour and is independent of solar activity. The change is largest in winter and smallest in summer. To prevent the skip distance from changing by more than 250 km, that is, to maintain continuous illumination of at least 50 percent of the barrier (nominal width 500 km), requires that the operating frequency be changed for every 6 percent change in foF2. Thus, in the case of an OTH system, the operating frequency has to be adjusted during the sunrise period every 6 to 20 min (seasonal dependence) for satisfactory performance. To accommodate such rapid changes, an empirical algorithm has been tested for improved foF2 predictions during sunrise. The prediction scheme is based on the availability of relevant (under the oblique raypath) real time ionospheric data.

Improving Fof2 Prediction For The Sunrise Transition Period

DOWNLOAD
Author : B. S. Dandekar
language : en
Publisher:
Release Date : 1986

Improving Fof2 Prediction For The Sunrise Transition Period written by B. S. Dandekar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Ionospheric forecasting categories.

During the 2- to 3-hr sunrise transition period, the relative change in foF2 is 20-60 percent per hour and is independent of solar activity. The change is largest in winter and smallest in summer. To prevent the skip distance from changing by more than 250 km, that is, to maintain continuous illumination of at least 50 percent of the barrier (nominal width 500 km), requires that the operating frequency be changed for every 6 percent change in foF2. Thus, in the case of an OTH system, the operating frequency has to be adjusted during the sunrise period every 6 to 20 min (seasonal dependence) for satisfactory performance. To accommodate such rapid changes, an empirical algorithm has been tested for improved foF2 predictions during sunrise. The prediction scheme is based on the availability of relevant (under the oblique raypath) real time ionospheric data.

Improvement Of Real Time F0f2 Prediction For Oth Radars

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Author : B. S. Dandekar
language : en
Publisher:
Release Date : 1995

Improvement Of Real Time F0f2 Prediction For Oth Radars written by B. S. Dandekar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Ionospheric forecasting categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1987

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Aeronautics categories.

Environmental Research Papers

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Author :
language : en
Publisher:
Release Date : 1995

Environmental Research Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Environmental geology categories.

Energy Research Abstracts

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Author :
language : en
Publisher:
Release Date : 1987

Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Power resources categories.

Monthly Catalog Of United States Government Publications

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Author :
language : en
Publisher:
Release Date :

Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Government publications categories.

Improving The Global Ionospheric Predictions Of F0f2

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Author : B. S. Dandekar
language : en
Publisher:
Release Date : 1976

Improving The Global Ionospheric Predictions Of F0f2 written by B. S. Dandekar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with F region categories.

Using the method of Rush and Gibbs (1973), weighted means of observed values have been used to update the global prediction of f(o)F2, which are based on monthly median values derived from the Institute of Telecommunications Sciences model (1969). This procedure improved the predictions for magnetically quiet periods, for times near minimum of the solar cycle phase, and for the equinoctial months. Furthermore, a closer grid of ionosonde stations resulted in reducing the error in the f(o)F2 prediction. For the method of Rush and Gibbs (1973) to be operationally successful in global predictions of f(o)F2 however, a closer grid of ionosondes than is presently available is needed. (Author).

The An Fps 118 Oth Radar

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Author : B. S. Dandekar
language : en
Publisher:
Release Date : 1996

The An Fps 118 Oth Radar written by B. S. Dandekar and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Ionospheric radio wave propagation categories.

Government Reports Announcements Index

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Author :
language : en
Publisher:
Release Date : 1986-11

Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986-11 with Science categories.