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Browsing by Author "Abdu, M.A."

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Amplitude enhancement of SC(H) events in the South Atlantic anomaly region

Trivedi, N.B.; Abdu, M.A.; Pathan, B.M.; Dutra, S.L.G.; Schuch, N.J.; Santos, J.C.; Barreto, L.M. (2005)

South Atlantic Magnetic Anomaly (SAMA) due to its weak total geomagnetic field F is known to be a sink of trapped charged particles from the inner radiation belt during both magnetically quiet and disturbed periods. ...
The Dayside Ionospheric “Superfountain” (DIS), plasma transport and other consequences

Tsurutani, B.T.; Saito, A.; Verkhoglyadova, O.P.; Mannucci, A.J.; Abdu, M.A.; Araki, T.; Gonzalez, W.D.; Iijima, B.A.; Lakhina, G.S.; McCreadie, H.; Sobral, J.H.A.; Tsuda, T.; Yumoto, K.; Vasyliunas, V.M. (2006)

Prompt penetration electric fields (PPEFs) and the consequential dayside ionospheric superfountain (DIS) are reviewed. An example of O+ uplift to ~840 km altitude at ~0940 local time (DMSP F15) during the superstorm of ...
Equatorial spread F: Statistical comparison between ionosonde and scintillation observations and longitude dependence

Iyer, K.N.; Jivani, M.N.; Pathan, B.M.; Sharma, S.; Chandra, H.; Abdu, M.A. (2003)

Spread F on ionograms and scintillations of trans-ionospheric signals arise from unstable structure of the ionospheric F-region occurring predominantly by night. The two techniques were applied to two pairs of sites in ...
Fast and ultrafast Kelvin wave modulations of the equatorial evening F region vertical drift and spread F development

Abdu, M.A.; Brum, Christiano G.M.; Batista, Paulo P.; Gurubaran, S.; Pancheva, Dora; Bageston, Jose V.; Batista, Inez S.; Takahashi, Hisao (2015)

In this paper, we investigate the role of eastward and upward propagating fast (FK) and ultrafast Kelvin (UFK) waves in the day-to-day variability of equatorial evening prereversal vertical drift and post sunset generation ...
A model of equatorial and low latitude VHF scintillation in India

Iyer, K.N.; Souza, J.R.; Pathan, B.M.; Jivani, M.N.; Joshi, H.P.; Abdu, M.A. (2006)

Using the observed VHF scintillations at equatorial and anomaly crest stations in India during the years 1987-1989, an empirical model is developed. The model employs the cubic spline technique to reproduce the variation ...
On the pre-midnight ascent of F-layer in the June solstice during the deep solar minimum in 2008 over the Indian sector

Chakrabarty, D.; Fejer, B.G.; Gurubaran, S.; Pant, Tarun K.; Abdu, M.A.; Sekar, R. (2014)

Investigations on the variations of the virtual height (h'F) of the base of the F-layer over Thumba (8.5°N, 77°E, dip lat 0.5°N) in 2002 (high solar activity) and 2008 (very low solar activity) under quiet geomagnetic ...
Prompt penetration electric fields (PPEFs) and their ionospheric effects during the great magnetic storm of 30–31 October 2003

Tsurutani, B.T.; Verkhoglyadova, O.P.; Mannucci, A.J.; Saito, A.; Araki, T.; Yumoto, K.; Tsuda, T.; Abdu, M.A.; Sobral, J.H.A.; Gonzalez, W.D.; McCreadie, H.; Lakhina, G.S.; Vasyliūnas, V.M. (2008)

[1] We explore the ionospheric effects of prompt penetration electric fields (PPEFs) for a variety of interplanetary magnetic field directions. We use the great magnetic storm of 30–31 October as an example of PPEF effects. ...
A statistical study of the response of the dayside equatorial F2 layer to the main phase of intense geomagnetic storms as an indicator of penetration electric field

Balan, N.; Yamamoto, M.; Sreeja, V.; Batista, I.S.; Lynn, K.J.W.; Abdu, M.A.; Ravindran, S.; Kikuchi, T.; Otsuka, Y.; Shokawa, K.; Alex, S. (2011)

The response of the dayside equatorial F2 layer to the main phases of the 22 intense geomagnetic storms (Dst < −150 nT) in 1998–2008 is investigated using the digital ionosonde data from the equatorial stations in Brazilian, ...
Unusual Generation of Localized EPB in the Dawn Sector Triggered by a Moderate Geomagnetic Storm

Sripathi, S.; Abdu, M.A.; Patra, A.K.; Ghodpage, R.N. (2018)

An interesting piece of observation related to the equatorial plasma bubble (EPB) that is triggered by a geomagnetic storm at dawn sector on 4–5 February 2011 is presented. The storm activity was initiated at 17 UT when ...

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