Solar Science

A blog of solar physics

SOHO back online: Sun still blank

with 3 comments

It’s difficult sometimes to carry on a blog when the primary focus of your discussion doesn’t do anything. That’s the nature of solar minima, I guess, but particularly true when you have an apparent regime change in the solar cycle.

The latest news is that SOHO is back online after a glitch forced the software onboard to be reloaded with new commands, and mission controllers took an opportunity to bake all of the CCDs onboard the spacecraft to remove dead pixels.

Today the Sun is blank.


This image from the EIT (Extreme ultra-violet Imaging Telescope) at 195 Angstroms show no spots and no significant coronal holes.


Written by John A

August 22, 2009 at 2:30 pm

3 Responses

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  1. There’s some interesting (for those interested in this sort of thing) solar-related research publications at:


    August 25, 2009 at 9:44 pm

  2. “It’s difficult sometimes to carry on a blog when the primary focus of your discussion doesn’t do anything.”

    It also hurts to have an economic meltdown and broken government concurrent as diversions.

    Good to have the Svensmark input to turn to. Was interested to see the spaceweather noctilucent cloud upturn which invalidates Sloan’s supposed absence of polar CR effect(not to say proof of CR effect).

    Also I was mildly surprised to find sometime(likely when Pluto was deprecated) cosmic rays are defined by professionals to no longer include photons of extra-galactic origin. This permits ignoring them while discussing the increased albedo.

    Anecdotally, the skies near 45 degress longitude and latitude are not as blue as I remember them, particularly in an August below normal temps and well above normal precip.

    gary gulrud

    August 26, 2009 at 2:52 am

  3. just wondering if there is some correlation between the suns lack of activity, and the possibility, according to some of the solar system entering a region of stellar dust. I notice the other planets are warming in line with the earth. again is there some correlation here?
    what can be said about the suns magnetic flux, again can this be correlated with the lack of sun spots, how does it compare with periods of high or moderate activity? finally I observe we are entering a strange part of the galaxy in the year 2012, again I wonder if this has some bearing on the inactivity of the sun,
    thank you for the sun research publications by the way.


    August 27, 2009 at 2:31 am

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