Personnel
>> Academic Staff
Dr.
R Lelwala |
Department
of Physics
University of Colombo
Colombo 03
Sri Lanka |
| Telephone |
+94
11 2584 777 (office)
+94
11 2728 804 (home) |
| Fax |
+94
11 2584 777 |
| Email |
lelwala@phys.cmb.ac.lk |
| Room |
105 |
| Extension |
269 |
|
 |
| Academic
Qualifications |
|
- B.Sc.
Physics Special Degree (University of Colombo, Sri
Lanka) with First Class Honors
- Ph.D.
(University of Colombo, Sri Lanka)
|
| Fields
of Specialization & Research Interests |
- Fair
Weather Atmospheric Electricity
- Instrumentation
|
| Publications |
- R.
Lelwala, T. Tuomi, S. Israelsson, K.P.S.C. Jayaratne,
(1999) Effect of wind on horizontal wire antenna collecting
atmospheric air-earth current, Proc. ICAE’99
610-613, Alabama, U.S.A., June.
- R.
Lelwala, S. Israelsson, K.P.S.C. Jayaratne, (1997)
Measurement of space charge density over flat ground
in nearly neutral stratified atmospheric surface layer,
Journal of Atmospheric and Electricity, Vol. 17, No.
2, pp. 59-68. R.
- R.
Lelwala S. Israelsson, K.P.S.C. Jayaratne, (1996)
Measurements of space charge density over flat ground
in nearly neutral stratified atmospheric surface layer,
Proc. ICAE’96 168-171, Osaka, Japan, June.
- S.
Israelsson, R. Lelwala, (1999) Space charge density
measurements downwind from a traffic route, Atmospheric
Research, 51, pp. 301-307.
- S.
Israelsson, R. Lelwala, (1997) Space charge layers
created by corona and electrode effects at ground
level below thunderclouds, 3rd International Workshop
on Physics of Lightning, 15-20 September 1997 in Saint
Jean de Luz, France.
- R.
Lelwala, K.P.S.C. Jayaratne, (1999) A low cost multi-channel
data logger for fair weather atmospheric electricity
measurements, Proc. Sri Lanka Assoc. Advmt. Sci. 55,
E1 197-198, Colombo, Sri Lanka, Dec.
- K.P.S.C.
Jayaratne, R. Lelwala, (1994) Long wire antenna set-up
for measurements of local global and extra terrestrial
effects of air earth conduction current, Proc. Sri
Lanka Assoc. Advmt. Sci. 50 E1-25, 212, Colombo, Sri
Lanka, Dec.
- K.P.S.C.
Jayaratne, R. Lelwala, (1993) Preliminary studies
on the measurement of air earth conduction current
density in Sri Lanka, J. Inst. Phys., Sri Lanka, 9,
1-5.
- A.B.
Weerasekera, I.M.K. Fernando, D.U.J. Sonnadara, R.
Lelwala, K.P.S.C. Jayaratne, S. Namasivayam, K.R.A.
Bandara, C. Gomes, T.R. Ariyaratna, (1999) Some features
of lightning ground flash activities observed in tropical
thunderstorms, Proc. Sri Lanka Assoc. Advmt. Sci.
55, E1, 186, Colombo, Sri Lanka, Dec.
- D.U.J.
Sonnadara, I.M.K. Fernando, S. Namasivayam, K.P.S.C.
Jayaratne, K.R.A. Bandara, R. Lelwala, A.B. Weerasekera,
C. Gomes, T.R. Ariyaratne, (1999) On the accuracy
of locating lightning ground flashes using two or
more direction finding stations, Proc. Sri Lanka Assoc.
Advmt. Sci. 55, E1, 187, Colombo, Sri Lanka, Dec.
- Measurements
of lightning peak currents in the first return stroke
of negative cloud-to-ground flashes, A.B. Weerasekera,
D.U.J. Sonnadara, I.M.K. Fernando, J.P. Liyanage,
R. Lelwala and T.R. Ariyaratne, Singapore J. of Physics,
submitted (2001)
- Activity
of Cloud-to-Ground lightning observed in Sri Lanka
and in the surrounding area of the Indian Ocean, A.B.
Weerasekera, D.U.J. Sonnadara, I.M.K. Fernando, J.P.
Liyanage, R. Lelwala and T.R. Ariyaratne, Sri Lankan
J. of Physics, accepted (2001)
- Locating
Cloud-to-Ground lighting flashes with simultaneous
two station measurements, D.U.J. Sonnadara, A.B. Weerasekera,
I.M.K. Fernando, R. Lelwala, K.P.S.C. Jayaratne, T.R.
Ariyaratne, S. Namasivayam and K.R.A. Bandara, Sri
Lankan J. of Phys., 1 (2000) 11-22
- Studies
on the basic atmospheric electrical parameters of
fair weather and related processes in the electrode
layer, R.Lelwala, PhD Thesis, (2001).
Construction of an electronic device for monitoring
voltage standing wave ratio (VSWR) of an transmission
antenna. DKRN Pradeep, WMKP Wijayaratne, R Lelwala,
& TGJ Amarasena. Sri Lankan Journal of Physics
2003.
- Some
Properties of lightning ground flashes observed in
and around Sri Lanka, and their seasonal variations.
J P Liyanage, D U J Sonnadara, I M K Fernando, A B
Weerasekara, R Lelwala and T R Ariyaratne. Sri Lanka
Journal of Physics Vol. 3 (2002) 77-88
- Activity
of Cloud-to-Ground lightning observed in Sri Lanka
and in the surrounding area of the Indian Ocean, A.B.
Weerasekera, D.U.J. Sonnadara, I.M.K. Fernando, J.P.
Liyanage, R. Lelwala and T.R. Ariyaratne, Sri Lankan
J. of Physics, 2 (2001) 21-30
- H
H E Jayaweera, R Lelwala, Construction of Telephone
Operable Messaging System, Institute of Physics -
SRi Lanka, Proc. 23rd Technical Session, Sri Lanka
(March 2007)
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