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Synoptic Analysis Drawings, also known as Neutral Line (NL) drawings, are produced
each day by space weather forecaster at the NOAA National Weather Service (NWS) Space
Weather Prediction Center (SWPC). These professional drawings ensure the forecasters
have a comprehensive view of all relevant solar features. Daily drawings are available
back to June 2, 1972 and are still being produced today. The drawing show features
such as neutral lines, coronal hole boundaries, active regions, plage, filaments and
prominences. Also included are specific information about coronal hole polarity, active
region numbers, flare probabilities for each region and proton event probabilities
for each region. The National Geophysical Data Center provides these drawings both
as pdf images, available online, or as high-resolution tif images available by request.
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