EISCAT:
 

August 18, 1999 - after reports of the August 17  NE streamer blowout: EISCAT observed a disturbance at 8/18 07:50. at lat=66, long = 294.  Assuming constant speed of 900 km/sec (observed) it would have been launched at >19:30 8/17.

More info:

Hi all.
Thanks for the tip-off Barbara. We're running (somewhat handicapped
by not having our Finnish site working yet, but we're running).
We've added in four extra NE limb observations which might or might
not produce useful data (they're using rather weak radio sources)
but which we hope will give some extra information.
Our NE limb observations for today are at:

18 R, 88N. E limb (good source)
37 R, 66N, E limb (source not used before)
43 R, 75N, E limb (weak source)
44 R, 66N, E limb (source not used before)
48 R, 79N, E limb (weak source)

I'll let you all know what we get.

Andy
 
 

Hi Sarah (& all).
        We observed the region above the NE limb at distances
between 18 and 48 R today - we _think_ we have evidence of
the passage of some of the prominence material and of the
void behind the ejecta, but we need to do some more
checking.
Looks very promising, though.
We're going to need a lot of help to make sense of some of
these observations, but I guess that's what WSM is about.

Andy

And regarding the NW CME on August 25: this one turns out to be a dud.
 

We definitely have a CME in the data from august 25 - this is good as
it comes in about 15 minutes into an extended run, so its time-of-arrival
at the EISCAT ray-path is very well determined.

        "The possible CME comes from a 30 minute observation
on 990825, source 1118p125 .

It becomes apparent in 2nd half of observation"

Time of arrival was just after 15 UT, point of closest approach of the
ray-path to the Sun was 28 N, 202 carrington longitude, 58 solar radii
distance.
Image of the correlation function is attached. We've not
done the full velocity fitting yet (this weekend, I hope), but the
negative lobe at zero lag which appears suddenly is very characteristic
of a CME.

Andy
 
 

NAGOYA STEL:

Dear colleagues,

A web page to show STEL IPS velocity observations
obtained in the period from Aug.1 to Sep.23, 1999,
is available now.

The estimated velocities listed there inlcude the effect
due to the line-of-sight integration.

We have the g-value data, but those are not ready to
open yet.   From the preliminary analysis of our g-value data,
a signature of IP diturbances can be found for some cases.

Best regards,
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Munetoshi Tokumaru
Solar-Terrestrial Environemnt Laboratory, Nagoya University
Fax: +81-533-85-3882
e-mail: tokumaru@stelab.nagoya-u.ac.jp
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