Cloud Height, Cloud Temperature and Cloud Attenuation in Microwave and Millimeterwave Frequency Bands over Indian Tropical East Coast

Sarkar, S. K.; Ahmad, Iqbal; Das, Jayanta Kumar; De, Arijit

doi:10.1007/s10762-005-3010-4

Cited by 11 publications

(15 citation statements)

References 4 publications

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“…Using approximation for the specific cloud attenuation in [1,2,[7][8][9], the specific cloud attenuation was expressed as…”

Section: Calculation Of the Specific Cloud Attenuationmentioning

confidence: 99%

“…The direct use of models mentioned above is limited in our case: the use of models of [1,2,[7][8][9] requires the knowledge of the values of cloud temperature and water content; there has been no possibility to measure the vertical profiles of pressure, temperature, and humidity with the radiosondes, and the use of model [10] has been restricted; the model [11] can be used at frequencies between 4 and 35 GHz, although the best accuracy will be found between 10 and 30 GHz. The empirical equation (3) has been derived for a cloud temperature of 10 • C and is suitable to use under climate conditions similar to the Boston climate.…”

Section: Calculation Of the Specific Cloud Attenuationmentioning

confidence: 99%

“…The height at which cloud exists is very important for accurate determination of results on attenuation due to clouds [2]. It was assumed in [8] and [18] that clouds are created starting in the vicinity of the height h, and h (km) follows ground temperature T 0 (K) as…”

Section: Calculation Of the Specific Cloud Attenuationmentioning

confidence: 99%

“…The rain attenuation has been widely analysed in past decades in various regions. The effect of rain on radio wave propagation is greater than that of clouds in many cases but the occurrence of clouds is always more often than rains [2]. However, the attenuation due to clouds has not been analysed enough.…”

Section: Introductionmentioning

confidence: 99%

“…This factor must be considered when analysing rain attenuation and cloud attenuation. The cloud attenuation in various regions was analysed in [1,2,[7][8][9][10][11][12]. The attenuation of radio waves due to rain under Lithuanian climatic conditions was analysed in [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Influence of clouds on attenuation of electromagnetic waves

Tamošiūnaitė¹

2008

Lithuanian J. Phys

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The semi-empirical method for determination of the cloud attenuation was used. The cloud attenuation was determined by using the meteorological data measured at the ground level. It was assumed that the clouds would form at some height above the ground level when the conditions for vapour condensation would be present and the liquid water content in the air would be above zero at that height. The values of height have been determined by using the values of temperature at the ground level, the dew point temperature, and the temperature gradient. The calculation results show that known relation between the temperature and the cloud base height is not always suitable for Lithuanian climate conditions. According to the meteorological data measured in the weather stations, relation between the height and temperature within the cloud, recommended by International Telecommunication Union, was chosen. Only summer profile was suitable to use under conditions investigated here. The values of relative humidity and temperature at the ground level were used in calculations of liquid water content within the clouds. The values of specific attenuation under conditions of cloud cover were computed by using the obtained liquid water content values at frequencies starting from 10 GHz and up to 70 GHz.

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“…Using approximation for the specific cloud attenuation in [1,2,[7][8][9], the specific cloud attenuation was expressed as…”

Section: Calculation Of the Specific Cloud Attenuationmentioning

confidence: 99%

Section: Calculation Of the Specific Cloud Attenuationmentioning

confidence: 99%

Section: Calculation Of the Specific Cloud Attenuationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of clouds on attenuation of electromagnetic waves

Tamošiūnaitė¹

2008

Lithuanian J. Phys

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Cloud Morphology Over Three Indian Tropical Stations for Earth Space Communication

Sarkar¹,

Kumar²,

Ahmad³

et al. 2006

Int J Infrared Milli Waves

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Cloud Attenuation in Millimeter Wave and Microwave Frequencies for Satellite Applications over Equatorial Climate

Mandeep

Hassan

2007

Int J Infrared Milli Waves

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A propagation experiment has been carried out at Penang using the SUPERBIRD-C satellite beacon. Cloud occurrences were observed during different months and it is seen that the low cloud occurrences over Penang is very significant from October to January. The cloud attenuation results that are presented, which include the testing of models, have been obtained from the data gathered over five years. The specific attenuation of radio wave due to clouds at various frequencies 12 GHz, 20 GHz, 75 GHz, 50 GHz and 100 GHz has been estimated whereby the values varies from 0.14 dB/km at 12 GHz to 10.1 dB/km at 100 GHz.

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Cloud Height, Cloud Temperature and Cloud Attenuation in Microwave and Millimeterwave Frequency Bands over Indian Tropical East Coast

Cited by 11 publications

References 4 publications

Influence of clouds on attenuation of electromagnetic waves

Influence of clouds on attenuation of electromagnetic waves

Cloud Morphology Over Three Indian Tropical Stations for Earth Space Communication

Cloud Attenuation in Millimeter Wave and Microwave Frequencies for Satellite Applications over Equatorial Climate

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