The seasonal and solar cycle variations of electron density gradient scale length, vertical drift and layer height during magnetically quiet days: Implications for Spread F over Trivandrum, IndiaReport as inadecuate




The seasonal and solar cycle variations of electron density gradient scale length, vertical drift and layer height during magnetically quiet days: Implications for Spread F over Trivandrum, India - Download this document for free, or read online. Document in PDF available to download.

Earth, Planets and Space

, Volume 61, Issue 12, pp 1339–1343

First Online: 18 January 2010Received: 19 May 2009Revised: 08 September 2009Accepted: 15 September 2009

Abstract

A study has been carried out on the behaviour of electron density gradient scale length, L, vertical drift and layer height, around post sunset hours, during the magnetically quiet days of summer, winter and equinox seasons of solar maximum 2002 and minimum years 1995, using ionosonde data of Trivandrum 8.5°N, 76.5°E, dip = 0.5°N in the Indian longitude sector. The results indicate a clear seasonal and solar cycle variation in all the three parameters. Further, the seasonal variation of equatorial Spread F ESF during the above period is examined in terms of the relative roles of L, the vertical drift and layer height of the F layer in the triggering of the collisional Rayleigh-Taylor instability. The results, show for the first time, that L also plays an important role, in controlling the quiet time seasonal and solar cycle variability of ESF; whereas in earlier studies this parameter had been taken to be constant. The detailed results are presented and discussed.

Key wordsEquatorial ionosphere ionospheric irregularities plasma instability equatorial Spread F  Download to read the full article text



Author: G. Manju - C. V. Devasia - Sudha Ravindran

Source: https://link.springer.com/







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