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Sorry we missed your reply. If the image is blank that means AOD was not observed for that location at that time because "MODIS Aerosol products monitor the ambient aerosol loading and some properties of the aerosol over cloud-free snow/ice-free land and ocean surfaces."

You must be looking at N09_AVH13C1 --NOAA-09 AVHRR NDVI product. Yes, that is only available for 1985 to 1988 period. However, the Long-term Data Record (LTDR) consists of products from AVHRR instruments on board various NOAA satellites which range from N07 (for NOAA-07 that was launched June 1981) ...

Yes, all UTC times.

This is because LAADS is having a systems maintenance:
https://ladsweb.modaps.eosdis.nasa.gov/alerts-and-issues/?id=78536
Please try again this afternoon or tomorrow.

Dear Marco Laiolo:
We just checked and all geoMeta files (MODIS and VIIRS) exist and looks normal. Do you have specific example that you want us to investigate?

LAADS Users Services

There was an issue with our system which has been resolved. So, please try again and you should be able to download data. Make sure you restart your browser before trying again.

There was an issue with our system which has been resolved. So, please try again and you should be able to download data. Make sure you restart your browser before trying again.

There was an issue with our system which has been resolved. So, please try again and you should be able to download data. Make sure you restart your browser before trying again.

Sorry, we don't have resources to help you with your Matlab request. However, try contacting HDF-EOS Tools and Information Center at eoshelp@hdfgroup.org directly and they might be able to provide some guidance.

Following are the only two L3 Angstrom Exponent data over ocean available from MODIS. These are available from L3 daily, weekly and monthly (M[O/Y]08_[D/E/M]3 products. Aerosol_AE1_Ocean_JHisto_vs_Opt_Depth Aerosol_AE2_Ocean_JHisto_vs_Opt_Depth where JHisto = Joint Histogram Complete product informa...