Cycle 24 - time to panic
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== Introduction == | == Introduction == | ||
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In this Nugget we conclude that it is too soon to panic, but that certainly we're seeing an unusually diminished level of activity. | In this Nugget we conclude that it is too soon to panic, but that certainly we're seeing an unusually diminished level of activity. | ||
- | == F10.7 == | + | == F10.7 and other indices == |
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+ | [[Image:99_f10.7_epochs.jpg|300px|thumb|left|'''Figure 1'': The F10.7 index for the last 24 months (red) and the average variation, | ||
+ | month by month since the peak of the corresponding maximum, for the four previous cycles in the record.]] | ||
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+ | [[Image:99_TSI-SORCE-2008-now.jpg|600px|thumb|center|'''Figure 2'': Three key indices of solar activity, showing the current minimum period from 2008 to the time of writing (April 11, 2009).]] | ||
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+ | This plot comes from a [http://www.leif.org/research/TSI-SORCE-2008-now.png Web page] that is updated daily. | ||
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+ | [http://www.leif.org/research/TSI-SORCE-2008-now.png daily view] | ||
== Counting the new and old spots == | == Counting the new and old spots == |
Revision as of 19:00, 11 April 2009
Nugget | |
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Number: | 99 |
1st Author: | Leif Svalgaard |
2nd Author: | and Hugh Hudson |
Published: | 13 April 2009 |
Next Nugget: | NUGGET 100 |
Previous Nugget: | Chree Analysis for Flares |
List all |
Contents |
Introduction
We're in an extended period of minimal solar activity (see Nugget 91 for a previous look at this issue - without flares, RHESSI is missing its most important observational work, and there has not been even a C-class flare yet this year. Will sunspots and flares ever return? How unusual is this behavior? In this Nugget we conclude that it is too soon to panic, but that certainly we're seeing an unusually diminished level of activity.
F10.7 and other indices
This plot comes from a Web page that is updated daily.
Counting the new and old spots
Historical fact
Conclusions
Facts about Cycle 24 - time to panicRDF feed
RHESSI Nugget Date | 13 April 2009 + |
RHESSI Nugget First Author | Leif Svalgaard + |
RHESSI Nugget Index | 99 + |
RHESSI Nugget Second Author | and Hugh Hudson + |