STUDY OF TROPOSPHERIC GRAVITY WAVES AT EQUATORIAL LATITUDE, INDIA

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STUDY OF TROPOSPHERIC GRAVITY WAVES AT EQUATORIAL
LATITUDE, INDIA

• M. LAL
• EQUATORIAL GEOPHYSICAL RESEARCH LABORATORY
• INDIAN INSTITUTE OF GEOMAGNETIC
• TIRUNELVELI 627011, INDIA
• E-MAIL MLAL_at_IIG.IIGM.RES.IN

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JULY 2000

• This figure shows the daily average of the
  tropospheric gravity wave amplitude obtained
  during July 2000. The upper panel is the Dst
  index for comparison.

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SPT 2000

• This figure shows the power spectral density
  (psd) of tropospheric gravity waves obtained at
  equatorial latitude, India during severe
  geomagnetic storm of Spt 2000. The upper panel is
  the daily average of gravity waves psd and lower
  panel is the Dst index.

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Oct Nov 2003

• This figure shows the tropospheric gravity waves
  amplitude obtained during Oct to Dec 2003. The
  upper panel is the Dst index and the lower panel
  is the amplitude of gravity waves measured at
  equatorial latitude station, India.

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July Aug 2004

• This figure shows the gravity wave amplitude
  variation for July to Spt 2004. the upper panel
  shows the Dst index variation. There is lag of
  about 20 days is seen between Dst enhancement and
  tropospheric gravity wave amplitude.

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Nov 2004

• This figure shows the amplitude of gravity wave
  variation and the Dst index variation for the
  month of Nov 2004. There is a time lag of 5 days
  is seen between gravity wave maxima and Dst
  index maxima.

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July Aug 2004

• This figure shows the contour plot of
  tropospheric gravity waves obtained during Aug
  2004. The presence of Acoustic gravity waves of
  period about 50 min has been obtained after the
  July 2004 geomagnetic storm.

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Oct Dec 2003

• This figure shows the contour plot of the
  tropospheric acoustic gravity waves obtained
  during Oct Dec 2003. There is significant
  increase in the gravity waves amplitude obtained
  after the geomagnetic storm.

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Nov 2004

• This figure shows the contour plot of acoustic
  gravity waves obtained during Nov 2004. The
  prominent presence of gravity waves is seen
  after the Geomagnetic Storm.

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Thank You

• Any question, please send me an e-mail.