Subject: Re: Fwd: FYI - Fwd: Cluster Science Report to DSMS '03-'04 Plans
Date: Sat, 10 Aug 2002 11:22:35 -0500
From: Jolene Pickett <pickett@uiowa.edu>
To: Charles P Holmes <cholmes@hq.nasa.gov>
CC: gurnett@space.physics.uiowa.edu, u2mlg@phaethon.gsfc.nasa.gov,
     James Sharber <jsharber@mail.hq.nasa.gov>, pickett@uiowa.edu

Dear Chuck,

Thanks for your email in advance of the RARB.  I would like to
point out two things, one of which is described in my report that
I delivered to Rich Miller and David Morris:

1.  The only opportunity on Cluster, even if it functions for 10
years or more, to obtain small scale (meaning simultaneous
multi-spacecraft, interspacecraft separations around 100 km)
measurements of the nightside magnetopause (a prime Cluster
objective) and dawn chorus (a WBD prime objective) is during
the time frame of Oct. 2003 through Jan. 2004.

2.  DSN has failed to fulfill its explicit stated requirement of
providing 10 microsecond timing accuracy for the entire
Cluster mission since launch.  We have a workaround
for one of the problems associated with this starting in
May of 2002.  A further problem is still unresolved and
there are no workarounds.  Trying to get this problem
resolved has consumed an inordinate amount of my time
and my data processor's time since about March of this year.

I would be happy to discuss both of the above with you
next week.

Jolene

Charles P Holmes wrote:

> Jolene,
>
> We (HQ) have been advertising for about a year and a half that
> non-Mars missions need to cut back science collection requirements
> for the DSN during the period of Nov 03 to Feb 04.  We have been
> actively working with all impacted missions to understand the global
> situation.   I discussed this general situation as it might impact
> Cluster w/ Don in Feb and w/ Philippe in April.  My omission for not
> talking to you directly.
>
> Getting the normal single aperture downlinks should not be impacted
> during this time period.  I am very doubtful that there will be many
> opportunities for multiple aperture collections during this period.
> I don't see how I can advocate any priority for your requests.
>
> See you next week.
>
> Chuck
>
> ++++++++++++++++++++++
>
> >Date: Fri, 09 Aug 2002 14:56:21 -0500
> >From: Jolene Pickett <pickett@uiowa.edu>
> >X-Mailer: Mozilla 4.7 [en] (Win98; I)
> >X-Accept-Language: en,pdf
> >To: David Morris <David.G.Morris@jpl.nasa.gov>,
Richard.B.Miller@jpl.nasa.gov
> >CC: Robert Dutilly <bob.dutilly@gsfc.nasa.gov>, rmahmot@hst.nasa.gov,
> >    CAbramo@jftl.jpl.nasa.gov, "Albert F. Chang" <afchang@jpl.nasa.gov>
> >Subject: Cluster Science Report to DSMS '03-'04 Plans
> >
> >Dear Rich and David,
> >
> >You have already received Bob Dutilly's revised input on Cluster.
> >Attached is a powerpoint file that describes in more detail why
> >the period November 2003 through January 2004 is a critical
> >period for Cluster.  As you will see there are at least two major
> >science objectives that will not ever be fulfilled by us on Cluster if
> >we do not get simultaneous data from all 4 spacecraft in this
> >critical period.  If you would like me to present any of this
> >material at your session after the RARB, I would be happy to
> >do so as I will be at JPL for the RARB and another meeting
> >the following morning.  However, I will not be available to
> >attend your September meeting, as it falls exactly on top of
> >a Cluster Science Ops Working Group, Science Working
> >Team and Science Workshop being held in the U.K.which
> >I need to attend.  If you feel a Cluster science person should
> >be at your September meeting, please let me know and I will
> >attempt to get one of our other science team members to attend.
> >
> >Please let me know if you have any questions regarding the
> >attached.
> >
> >Best regards,
> >
> >Jolene
> >
> >
> >Robert Dutilly wrote:
> >
> >>  David,
> >>
> >>  Jolene Pickett provided me additional and important information on
Cluster
> >>  during the time period 2003-2004.  She will be sending you
> >>detailed information
> >>  on Cluster science later today.  These are critical events which will
only
> >>  occur during the entire mission at this and only this time period.
> >>
> >>  2003:                                           priority
> >>  November:
> >>    2 MSO supports                             5
> >>    12 SSO supports each week             5
> >>            (weeks 45 to 48)
> >>    Dawn Chorus                                 3
> >>            (weeks 45 to 48)
> >>    Night Side Magnetopause                3
> >>            (weeks 46 to 48)
> >>
> >>  December:
> >>    2 MSO supports                             5
> >>    12 SSO supports each week             5
> >>            (weeks 49 to 1)
> >>    Dawn Chorus                                 3
> >>           (weeks 49 to 1)
> >>    Night Side Magnetopause                 3
> >>           (weeks 49 to 51)
> >>
> >>  January:
> >>    2 MSO supports                             5
> >>    12 SSO supports each week             5
> >>          (weeks 2 to 5)
> >>    Dawn Chorus                                 3
> >>          (weeks 2 to 5)
> >>
> >>  February:
> >>    2 MSO supports                             5
> >>    12 SSO supports each week             5
> >  >      (weeks 6 to 9)
> >  >
> >  > If you have any questions give me a call.
> >  >
> >  > thanks
> >  > Bob