Hi Yusuf,

Have a look at: http://solrad-net.gsfc.nasa.gov/

Just that you know that, SolRad-Net (Solar Radiation Network) is an established network of ground-based sensors providing high-frequency solar flux measurements in quasi-realtime to the scientific community and various other end users. This network was implemented as a companion to AERONET and its instrumentation are invariably collocated with AERONET sites. The Brazilian core of the present network was developed within the scientific framework of the LBA-ECO component of the Large-Scale Biosphere-Atmosphere Experiment in Amazônia. Historically, SolRad-Net has preferentially selected sites that routinely experience intervals of biomass-burning, such as Amazônia and Sub-Saharan Africa for its long-term monitoring.

NOTICE TO NON-SolRad-Net INVESTIGATORS: To maintain the integrity of the database and fairness to the individuals who have contributed, use of these data for publication requires an offer of authorship to the SolRad-Net PI(s)

NEWS

- Recently Added Sites

El Nido Airport (2012) Lulin (2009)

Penang_USM (2012) Barcelona (2009)

Palangkaraya (2012) Manaus (2008)

Yonsei University (2012) Pantnagar (2008)

Toravere BSRN (2012) Rio Gallegos, Argentina: CEILAP (2007)

Appalachian State (2012) Buenos Aires, Argentina: CEILAP (2007)

Bozeman (2011) Barrow BSRN (2007)

Silpakorn University (2010) Bermuda BSRN (2007)

Regina (2009) Boulder BSRN (2007)

- New and Updated Solrad-Net Documents

Pyranometer Maintenance (PDF)

Using the Kipp & Zonen LogBoxSD with KZ Connect software

Data Transfer Using LogBoxSD (PDF)

KZ Connect Software (EXE)

------------------

Happy hunting,

Frank

I suggest you to use CMSAF data, take a look at www.cmsaf.eu You have to log in (for free) and then you can have access to a wide range of operational products for beam and global irradiation with different kind of coverages and spatial-temporal resolutions. 

I would try

http://wrdc-mgo.nrel.gov/

It is the homepage of WMO radiation data center. they should have all data you are interested in.

I think this web page useful: http://docs.lib.noaa.gov/

Out of my expertise, I do not know..

Be more specific about the area of interest. Not all available datasets cover the world! Moreover, are you looking for a hourly, daily or monthly time step, over that whole period, or just a TMY, or...?

Thank you Dr. Chris. To be specific, I need hourly Direct Normal,  Diffuse solar and Global  solar radiation for all 36 state capitals in Nigeria, West Africa over a period of 25 years, that is from: 1990 to 2015.

For Nigeria, the only measurements of relatively good quality that are known to exist were those of the Ilorin BSRN station, but they have stopped a long time ago. Everything else is modeled one way or another, but usually based on cloud data from satellite imagery. I don't think all what you ask (hourly data for 25 years) for exists, specially for free. The closest possibilities are:

- NASA SSE (1983-2005 monthly means only, low spatial resolution) https://eosweb.larc.nasa.gov/cgi-bin/sse/

- CM-SAF, https://wui.cmsaf.eu/safira/action/viewProduktList?d-1342877-p=2&dId=2, https://wui.cmsaf.eu/safira/action/viewProduktList?id=2

- MACC-RAD (since 2004), http://www.soda-pro.com/web-services/radiation/macc-rad

Higher-quality hourly or half-hourly Databases for 1994-2015 do exist at high spatial resolution, but on a commercial basis. Contact me if you're interested.

Thank you Dr. Chris

weatherbase.com

BSRN database

Be more sepcific: What location(s) and at what time step? Would a TMY be enough?

You might want to check out 

http://landsaf.meteo.pt

but they have only data for Europe and Africa.

energy plus is the best source for weather data.

https://energyplus.net/weather

Thank you all

www.soda-is.com

available data for two years 2005 and 2006

http://www.soda-pro.com/web-services/radiation/helioclim-3-for-free. I have downloaded the data recently . 

The updated PVGIS portal is one of the best sources of free data because it covers most of the world, provides both time series and TMY, and is of better quality than older stuff (like Helioclim 3).

http://re.jrc.ec.europa.eu/pvg_tools/en/tools.html

This is modeled data, however. Next time, be more specific about you want: Measured or modeled data? Which region of the world? Time series or TMY?

You can also find high time resolution data for free from the Copernicus CAMS service, from february 2004 up to two days before the current day there:

http://www.soda-pro.com/web-services/radiation/cams-radiation-service

This service covers the zone in the meteosat Second Generation satellite field of view (Europe, africa, Middle-East and most of Brazil)

The Solcast API provides solar irradiance data for all continents except Antarctica, and offers free data for public research use.

https://solcast.com.au/

Our team have made this type of data freely available via our API, its very easy! Get FREE access to solar radiation data for researchers like yourself via Solcast. Read more at:

https://articles.solcast.com.au/solar-data-api/free-access-to-solar-irradiance-data-for-non-commercial-research-use

And

http://solcast.com.au

You'll be able to find GHI, DNI and Diffuse solar radiation data for your location, plus anywhere else in the world.

you can download solar radiation data from following link:

1. https://www.ncdc.noaa.gov/data-access/land-based-station-data/land-based-datasets/solar-radiation

2. https://www.nasa.gov/mission_pages/sdo/science/solar-irradiance.html

We've already had 155 researchers and students from around the world register for FREE Solcast solar radiation data (Normal, Diffuse, Global): https://solcast.com.au/solar-data-api/free-solar-radiation-historical-and-forecasting-data-for-researchers/

Thank you all

can anyone suggest worldwide sources for surface downward longwave in situ or the downward net radiance ? Is there an easy to use visualization interface enabling for multi period averages/summaries?

Thank you

Randy

Hi,

you can use data from NASA's satellite sites Use these sites there are values ​​for solar radiation and good luck.

https://ceres.larc.nasa.gov/order_data.php

https://earthdata.nasa.gov/

Thank you, Yussra

Hi brother,

I need a free website to download meteorological parameters data from China. can you please suggest to me some websites?.