Spotless Days


As of today, 26 August, 2009, the sun has not had a sunspot  for 47 days.  Since 1849, this is the 5th longest period without sunspots. If there are no sunspots in the next two days,  the new total of 49 will put this period in 4th place.   The number 1 period was 92 days long without a sunspot and that occurred in 1913.  See chart below for other long periods without sunspots.

The sun’s activity remains low with the 10.7 solar radio flux at 67. If you are unfamiliar with this measurement, the following from my entry   “Sun and Climate—an  Essay”  should help:

Another indicator of the Sun’s activity is the 10.7 cm (2800 MHz) radio flux.  This measurement is the amount of solar noise that is emitted by the sun at 10.7 cm wavelengths. Some consider it to be better than Sunspots as an indicator of solar activity.  The solar flux is measured and reported at approximately 1700 UT daily.   It can vary from values below 50 to values in excess of 300 (representing very low solar activity and high to very high solar activity respectively). Values in excess of 200 occur typically during the peak of the solar cycles.

PERIODS WITH SPOTLESS DAYS (>20DAYS) SINCE 1849

Courtesy of Solaemon’s Spotless Days Page

Spotlessoverview

Cbdakota

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s