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Browsing IIAP Publications by Subject "F Region"

Now showing items 1-15 of 15

Day-to-day variability of midlatitude F region in winter

Sastri, J. H (National Institute of Science Communication and Information Resources, CSIR, 1977-06)

A study is made of the day-to-day variability of midlatitude F region during winter daytime conditions, using total electron content (TEC) measurements at Auckland and Invercargill and peak density measurements at Auckland ...
Doppler frequency fluctuations of lower thermospheric reflections in the equatorial electrojet region

Sastri, J. H; Ramesh, K. B; Rao, J. V. S. V (Elsevier, 1991-07)

The origin of short-period fluctuations from Doppler frequency-shift (P) data is investigated by examining their quantitative relationships with ambient electrojet strength and associated ionospheric conditions. The wave ...
Equatorial electric-fields of ionospheric disturbance dynamo orgin

Sastri, J. H (European Geosciences Union, 1988-12)

Persistent and significant reductions in the strength of the equatorial electrojet, accompanied by poor development of the equatorial ionization anomaly, are noted to sometimes occur in association with negative ionospheric ...
IMF polarity effects on the equatorial ionospheric F-region

Sastri, J. H (1985)

An exploratory study is made of the influence, during the equinoxes, of the interplanetary magnetic field (IMF) sector structure on the ionospheric F-region using ionosonde data from several equatorial stations for a 3-yr ...
Interplanetary magnetic field and equatorial ionosphere

Sastri, J. H (European Geophysical Society, 1980-06)

Relationships between events in the interplanetary magnetic field and the equatorial ionosphere are investigated. Simultaneous data showing sudden northward transitions of the interplanetary magnetic field and nighttime ...
Ionosphere scintillations associated with features of equatorial ionosphere

Chandra, H; Vats, H. O; Sethia, G; Deshpande, M. R; Rastogi, R. G; Sastri, J. H; Murthy, B. S (European Geophysical Society, 1979-09)

Amplitude scintillations of radio beacons aboard the ATS-6 satellite on 40 MHz, 140 MHz and 360 MHz recorded during the ATS-6 phase II at an equatorial station Ootacamund (dip 4 deg N) and the ionograms at a nearby station ...
Ionospheric electron content and equivalent slab thickness in the equatorial region

Das Gupta, A; Basu, S; Bhar, J. N; Bhattacharyya, J. C (American Geophysical Union, 1975-02)

The ionospheric total electron content and equivalent slab thickness in the equatorial region around 75° E have been studied. It is found that the slab thickness exhibits a strong latitudinal dependence with a maximum at ...
On the growth and decay of blanketing sporadic-E layers

Sastri, J. H (The Council of Scientific and Industrial Research, 1980-02)

Vertical incidence ionospheric soundings with a C-3 ionosonde were performed at Kodaikanal (dip 3.5 deg N) at one minute intervals during October 1974-January 1975 with a view to monitoring the small scale fluctuations in ...
On the height control of the onset of equatorial spread-F

Sastri, J. H; Subrahmanyam, V; Sasidharan, K; Srirama Rao, M. (Indian Academy of Sciences, 1978-07)
On the nature of substorm-related transient electric field disturbances in the equatorial ionosphere

Sastri, J. H; Ramesh, K. B; Karunakaran, D (Elsevier, 1992-01)

Results are presented of a study of h-prime F data derived from interval ionograms recorded on the night of August 29-30, 1957 at Kodaikanal (10 deg 14 min N, 77 deg 29 min E, geomag. lat. 0.6 deg N) during a geomagnetic ...
Origin of short-period (30-300 s) Doppler frequency fluctuations of lower F region reflections in the equatorial electrojet region

Sastri, J. H; Ramesh, K. B; Rao, J. V. S. V; Somayajulu, V. V (American Geophysical Union, 1991-12)

Measurements of phase path P of lower F-region reflections at normal incidence at Kodaikanal revealed the ubiquitous presence of 30-300-s quasi-sinusoidal variations in the time rate of change of phase path, P (Doppler ...
Seasonal and sunspot-cycle effects in the occurrence of equatorial spread-F configurations

Sastri, J. H; Sasidharan, K; Subrahmanyan, V; Rao, M. S (National Institute of Science Communication And Information Resources, 1979-06)
Small scale fluctuations in the F-region critical frequency at Kodaikanal

Sastri, J. H; Murthy, B. S (Japan Science and Technology Agency, 1977-03)

Some preliminary results obtained on the small scale fluctuations in the F-region critical frequency at Kodaikanal (Dip 3.5 deg) using 1-min interval ionograms, are presented. Spectral analysis showed the fluctuations to ...
Total electron content and F-region electron density distribution near the magnetic equator in India

Rastogi, R. G; Sethia, G; Chandra, H; Deshpande, M. R; Davies, K; Murthy, B. S (Pergamon Press, 1979-06)

Total electron content derived from the group delay measurements of ATS-6 radio beacons received at Ootacamund (India) are compared with the electron-density vs height distributions derived from the ionosonde data of the ...
Transient composite electric field disturbances near dip equator associated with auroral substorms

Sastri, J. H; Ramesh, K. B; Rao, H. N. R (American Geophysical Union, 1992-07)

Ionosonde data of Kodaikanal (Geog.Long. 77° 29′E, dip 3.0°N) and Huancayo (Geog.Long. 75°18′W, dip 2.0°N) are used to show the simultaneous occurrence of a transient disturbance in F region height of composite polarity ...

Browsing IIAP Publications by Subject "F Region"

Browsing IIAP Publications by Subject "F Region"

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