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Ionospheric Effects of Solar Flares

  • A. P. Mitra

Part of the Astrophysics and Space Science Library book series (ASSL, volume 46)

Table of contents

  1. Front Matter
    Pages I-XI
  2. A. P. Mitra
    Pages 1-7
  3. A. P. Mitra
    Pages 86-107
  4. A. P. Mitra
    Pages 108-125
  5. A. P. Mitra
    Pages 126-146
  6. A. P. Mitra
    Pages 252-278
  7. Back Matter
    Pages 279-296

About this book

Introduction

Sudden Ionospheric Disturbances resulting from an interaction of the Solar Flare radiation with the constituents of the upper atmosphere constitute one of the three major aspects of ground level monitoring of solar flares -the other two being optical observations of flares, and the observations of solar bursts in radio wavelengths. SIDs, therefore, form a major part of flare monitoring programme in many observatories. Unlike the other two, however, the ionospheric effects of flares provide one major additional source of interest - the reaction of the ionospheric plasma to an impulsive ionization. The high atmosphere provides a low pressure laboratory without walls in which a host of reactions occur between electrons, ions and neutral particles. The resulting products and their distributions may bear no resemblance to those of the primary neutral constituents or their direct ionization products. The variations with the time of the day, with season and with solar activity that form the bulk of the ionospheric measurements are too slow to allow any insight into the nature of these ionospheric reactions whose lifetimes are often very short. The relaxation time of the ionospheric ionization is only a few minutes or fraction of a minute in the lower ionosphere and in the E-region and is about 30 min to an hour at 300 km. The flares provide a sudden short impulse comparable to these time scales.

Keywords

Anomalie Solar flare Variation cosmic ray ionosphere solar

Authors and affiliations

  • A. P. Mitra
    • 1
  1. 1.Radio Science DivisionNational Physical LaboratoryNew Delhi-12India

Bibliographic information

  • DOI https://doi.org/10.1007/978-94-010-2231-6
  • Copyright Information Springer Science+Business Media B.V. 1974
  • Publisher Name Springer, Dordrecht
  • eBook Packages Springer Book Archive
  • Print ISBN 978-94-010-2233-0
  • Online ISBN 978-94-010-2231-6
  • Series Print ISSN 0067-0057
  • Buy this book on publisher's site
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