Solar Ultraviolet Radiation for Psoriasis Treatment at Nakhon Pathom Province

Main Article Content

Sumaman Buntoung
Somjet Pattarapanitchai
Pradthana Laiwarin
Einapak Boontaveeyuwat
Serm Janjai


Psoriasis is one of the long-term (chronic) skin diseases that cause problems to the immune system. Artificial light source in ultraviolet radiation (UV) wavelength, especially in the UV-B band, is one of the standard treatments for psoriasis. Alternatively, natural sunlight is also used for the treatment, called heliotherapy. Consistent solar radiation at a particular location and time is key to successfully giving a safe and effective natural sunlight treatment. Therefore, in this study, solar ultraviolet radiation for psoriasis heliotherapy at a site in Thailand was first investigated to reveal its diurnal and seasonal variations and efficiency in the therapy. A spectroradiometer (DMc150) installed at Silpakorn University, Nakhon Pathom province (13.82 ºN, 100.04 ºE) was used to measure spectral irradiance and converted to anti-psoriasis irradiance. This irradiance was calculated to obtain the monthly average hourly anti-psoriasis ultraviolet radiation data (2016-2018). The result showed the diurnal and seasonal variations of the anti-psoriasis ultraviolet radiation. The values are relatively high from 10 a.m. to 2 p.m., especially between March and October, and relatively low from November to February. The maximum monthly average hourly values in the summer, rainy, and winter seasons were 77.6, 76.9, and 52.4 mJ/cm2. In addition, an empirical model for estimating the anti-psoriasis ultraviolet radiation dose was first generated as a linear regression by using the UV index, which is a broader measurement. The difference between the data obtained from the model and the measurement is in good agreement with root mean square difference (RMSD) and mean bias difference (MBD) were 12.9% and 1.0%, respectively.


Download data is not yet available.

Article Details

How to Cite
Buntoung S, Pattarapanitchai S, Laiwarin P, Boontaveeyuwat E, Janjai S. Solar Ultraviolet Radiation for Psoriasis Treatment at Nakhon Pathom Province. J Appl Res Sci Tech [Internet]. 2022 Jun. 6 [cited 2023 Nov. 28];21(1):34-43. Available from:
Research Articles


Diffey BL. Sources and measurement of ultraviolet radiation. Methods. 2002;28(1):4-13.

Foyo-Moreno I, Manzano VJ, Arboledas L. Ground based ultraviolet (290–385 nm) and broadband solar radiation measurements in South-Eastern Spain. Int J climatol. 1998;18:1389-400.

Srisawang N, Ngernchuklin P, Chaiyasat A, Chaiyasat P. [Polymer microcapsules encapsulating photocatalyst nanoparticles

for dye treatment in wastewater]. JARST [Internet]. 2020 Aug. 5 [cited 2022 Apr. 22];19(2):1-16. Available from: Thai

Rivas M, Calaf GM, Laroze D, Rojas E, Mendez J, Honeyman J, Araya MC. Solar ultraviolet A radiation and nonmelanoma skin cancer in Arica, Chile, J Photochem Photobiol B, Biol. 2020;212:1011-1344.

Ohnaka T. Health effects of ultraviolet radiation. Ann Physiol Anthropol. 1993;12(1):1-10.

Feister U, Laschewski G, Grewe RD. UV index forecasts and measurements of health-effective radiation. J Photochem Photobiol B, Biol. 2011;102(1):55-68.

Elmets CA, Lim HW, Stoff B, Connor C, Cordoro KM, Lebwohl M, et al. Joint American Academy of Dermatology–National Psoriasis Foundation guidelines of care for the management and treatment of psoriasis with phototherapy. J Am Acad Dermatol. 2019:81(3):775-804.

Chen X, Yang M, Cheng Y, Liu GJ, Zhang M. Narrow-band ultraviolet B phototherapy versus broadband ultraviolet B or psoralen-ultraviolet A photochemotherapy for psoriasis. Cochrane Database Syst Rev. 2013;10:CD009481.

Almutawa F, Alnomair N, Wang Y, Hamzavi I, Lim HW. Systematic review of UV-based therapy for psoriasis. Am J Clin Dermatol. 2013;14(2):87-109.

Krzyscin JW, Jarosławski J, Rajewska-Wiech B, Sobolewski PS, Narbutt J, Lesiak A, et al. Effectiveness of heliotherapy for psoriasis clearance in low and mid-latitudinal regions: a theoretical approach. J Photochem Photobiol B, Biol. 2012;115:35–41.

Gardiner CF. Heliotherapy in Colorado. Trans Am Climatol Clin Assoc. 1915;31:184-91.

Metzger J. The clinical application of heliotherapy. Trans Am Climatol Clin Assoc. 1926;42:132-8.

Alpert JS. The Jeremiah Metzger lecture: Jeremiah Metzger and the era of heliotherapy. Trans Am Climatol Clin Assoc. 2015;126:219-26.

Buchholz W. Heliotherapy of psoriasis. Z Haut Geschlechtskr. 1969;44(1):13-6.

Körbler J. To the history of development of heliotherapy. Hippokrates. 1967;38(4):145-50.

Linser K, Harnack K. Heliotherapy of mycosis fungoides. Clin Exp Dermatol. 1962;215:181-201.

Nilsen L, Søyland E, Krogstad, AL. Estimated UV doses to psoriasis patients during climate therapy at Gran Canaria in March 2006. Atmos Chem Phys Discuss. 2008;8:1-19.

Snellman E. Comparison of the anti-psoriatic efficacy of heliotherapy and ultraviolet B: a cross-over study. Photodermatol Photoimmunol Photomed. 1992;9(2):83-5.

Snellman E, Jansen, CT, Lauharanta J, Kolari P. Solar ultraviolet (UV) radiation and UV doses received by patients during four-week climate therapy periods in the Canary Islands. Photodermatol Photoimmunol Photomed 1992;9(1):40-3.

Snellman E, Aromaa A, Jansén CT, Lauharanta J, Reunanen A, Jyrkinen-Pakkasvirta T, et al. Supervised four-week heliotherapy alleviates the long-term course of psoriasis. Acta Derm Venereol. 1993;73(5):388-92.

Snellman E, Lauharanta J, Reunanen A, Jansén CT, Jyrkinen-Pakkasvirta T, Kallio M, et al. Effect of heliotherapy on skin and joint symptoms in psoriasis: a 6-month follow-up study. Br J Dermatol. 1993;128(2):172-7.

Kanayama H, Kusaka Y, Hirai T, Inoue H, Agishi Y, Schuh A. Climatotherapy in Japan: a pilot study. Int J Biometeorol. 2017;61(12):2141-3.

Takada Y, Irisawa K, Kawada A. Heliotherapy of pityriasis lichenoides chronica. J Dermatol. 1977;4(3):91-4.

Raksasat R, Sri-Iesaranusorn P, Pemcharoen J, Laiwarin P, Buntoung S, Janjai S, et al. Accurate surface ultraviolet radiation forecasting for clinical applications with deep neural network. Sci Rep. 2021;11(1):5031.

Janjai S, Buntoung S, Masiri I, Wattan R. Mapping solar ultraviolet radiation from satellite data in a tropical environment. Remote Sens Environ. 2010;114(3):682-91.

Janjai S, Kirdsiri K, Masiri I, Nunez M. An investigation of solar erythemal ultraviolet radiation in the tropics: a case study at four stations in Thailand. Int J Climatol. 2010;30:1893-903.

Iqbal M. An introduction to solar radiation. New York: Academic Press; 1983.

Miyauchi M, Nakajima H. Determining an Effective UV Radiation Exposure Time for Vitamin D Synthesis in the Skin Without Risk to Health: Simplified Estimations from UV Observations. Photochem Photobiol. 2016;92(6):863-869.

World Health Organization (WHO), World Meteorological Organization (WMO). United Nations Environment Programme (UNEP), International Commission on Non-Ionizing Radiation Protection (ICNIRP), Global Solar UV Index: A Practical Guide, Watch No 95, WMO/

TD No. 625, Geneva, Switzerland. 2002.

Krzyscin JW, Guzikowski J, Czerwinska A, Lesiak A, Narbutt J, Jarosławski J, et al. 24 hour forecast of the surface UV for the antipsoriatic heliotherapy in Poland. J Photochem Photobiol B, Biol. 2015;148:136-44.