It's likely that at any given time some of the following links may be unavailable, and some of the data may be incomplete. However, I've found all of the following quite useful.

• This site has solar flux values measured every hour, from a variety of observatories. Data are given for today and yesterday, at frequencies of 245, 410, 610, 1415, 2695, 2800, 4995, 8800 and 15400 MHz. Not all frequencies are available at all hours. gopher://solar.sec.noaa.gov:70/00/lists/radio/rad

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• Cracow observatory: daily and monthly mean solar flux at frequencies of 275, 405, 670, 810, 925, 1080, 1215, 1350, 1620 and 1755 MHz, at http://www.oa.uj.edu.pl/sol/ . This page is an index. An example of data, for March 1999, is at: http://www.oa.uj.edu.pl/sol/9903.htm .

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• The URL http://www.ips.gov.au/rwc/data/sol/learmonth/rdata/readme is the README file for Learmonth Obserevatory Radio flux data, which is given for frequencies of 245, 410, 610, 1415, 2695, 4995, 8800 and 15400 MHz.
  The index of the data is at:
  http://www.ips.gov.au/rwc/data/sol/learmonth/rdata/ , with example data, for 28 February 1999 (i.e. 28.02), given in columns of peak and mean flux for each of the 8 frequencies, at http://www.ips.gov.au/rwc/data/sol/learmonth/rdata/rdata.28.02

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• Plots of yesterday's solar data from Learmonth at 245, 410, 610, 1415, 2695, 4995, 8800 and 15400 MHz are at http://www.ips.gov.au/rwc/data/sol/learmonth/rdata1yest.gif .

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• More data from Learmonth, at frequencies of 1300, 1540, 1707, 2300, 5625, 6000, 8000, 8200 and 10400 MHz is at http://www.ips.gov.au/rwc/data/sol/learmonth/iflux.html

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• The latest official 10.7 cm (2800 MHz) solar flux density values from the DRAO at Penticton - the official solar radio flux data - can be found at: http://www.drao.nrc.ca/icarus/www/current/current.flx with an explanation of the data and montioring program at: http://www.drao.nrc.ca/icarus/www/sol_home.shtml .

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• This site gives the current text of the solar terrestrial indices, as broadcast from WWV at 18 minutes past each hour: gopher://solar.sec.noaa.gov:70/00/latest/wwv .

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  Darrel Emerson top page.