John Davis wrote:
>The info you want is in the BSS Glossary (plug, plug!) under
"semidiameter".
>The answers are 15.76 arcmins in July (aphelion) and 16.29 arcmins in
>January (perihelion). For the purposes of looking at sunspots, I'd say
this
>was insignificant. If the differences were much la
>Hello all:
I just looked at the SOHO solar satellite photos of the sunspots and noticed
that the spots were different from the ones I saw on Christmas morning.
Could it be that SOHO was on the opposite side of the sun when the picture
was taken? Or maybe the sun's rotation since Christmass broug
I think that the SOHO images are updated at least once a day. The latest
sunspot image was taken at 10:16 UT today. The satellite is in a
zero-gravity region between the earth and the sun, so I would think that it
is always on our side of the sun, although I don't know for certain. The
sun's
According to a NASA Web site:
The MDI (Michelson Doppler Imager) images shown here are taken in the
continuum near the NiI 6768 Angstroms line. The most prominent solar
features are the sunspots on the solar photosphere. This is very much
how the Sun looks like in the visible range of the spectru
WOW! Those are some great images...
What are the LASCO instruments? Obviously the large central disk is an
occulting disk, allowing the corona to be photographed; I assume the
smaller central circle is the true diameter of the Sun. The LASCO C3 image
contains a lot of starfield background, so I s
Greetings, fellow dialists
Slawek Grzechnik wrote that you can measure the sun's diameter with a
marine sextant but that you should try to avoid a mistake when reading
negative angles off the vernier.
The mistake here is that Slawek has not yet sold his vernier sextant for
a large profit. These
Dave Bell wrote:
> WOW! Those are some great images...
>
> What are the LASCO instruments? Obviously the large central disk is an
> occulting disk, allowing the corona to be photographed; I assume the
> smaller central circle is the true diameter of the Sun. The LASCO C3 image
> contains a lot
On Wed, 3 Jan 2001, R.H. van Gent wrote:
> The LASCO (Large Angle Spectrometric Coronagraph) instrument is designed
> to observe the solar corona (the very faint outer atmosphere of the
> Sun).
>
> The bright object left of the Sun in the LASCO C3 image is Mercury and
> the horizontal line appea
