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Message Subject Hey Hey, A G2 Class Geomagnetic Storm
Poster Handle Anonymous Coward
Post Content
Proton density -9999


 Quoting: Imageneyes

Look at the Status column.

Status(S): 0 = nominal data, 1 to 8 = bad data record, 9 = no data

And the two examples:
2011 02 04 2200 55596 79200 1 8.3 556.4 5.63e+05

2011 02 04 2201 55596 79260 9 -9999.9 -9999.9 -1.00e+05

Top one has relatively good data which only a 1 in the status column.

Bottom one has no data, hence the 9. And it's shows the -9999.9 to easily tell which it is, because the solar wind can actually have a density of 0.

A lot of reasons why that happens, not going to go into them.
 Quoting: OTOC

there is never a zero density, it's just beyond measurable limits. saying it is zero is like saying the sun stops are there is no wind. the air is ALWAYS moving, even if we can't feel it or measure it
 
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