Sender: wap@head-cfa.harvard.edu
Message-ID: <38FEFDF5.DD8B2B90@cfa.harvard.edu>
Date: Thu, 20 Apr 2000 08:54:13 -0400
From: "William A. Podgorski" <wpodgorski@cfa.harvard.edu>
To: cal@head-cfa.harvard.edu, ctitask@head-cfa.harvard.edu,
        sot@head-cfa.harvard.edu
Subject: ACE Fluence During Solar Flare on April 5/6/7

All,

The key orbital events during the solar flare of April 5/6/7 (days
96/97/98) are as follows:

2000:096:04:47:34.454     91       EPERIGEE      ORBIT PERIGEE
 --->2000096.115204926      SIMTRANS from -99616 to 74424 Dur 304  secs
     Fluence = 0.0

     2000096.115205118      GRATINGS NONE to HETG
2000:097:12:31:46.991     92       EAPOGEE       ORBIT APOGEE
     2000097.184601698      OBSID 62093
     2000097.195505531      OBSID 426
     2000097.200642917      SIMTRANS from 74424 to 75624 Dur 66  secs
     2000098.012019688      OBSID 62092
     2000098.020025612      OBSID 819
 --->2000098.021248847      GRATINGS HETG to NONE

     Fluence = 4.21E+9
     2000098.073650080      SIMTRANS from 75624 to 80304 Dur 71  secs
     2000098.073710859      OBSID 318
 --->2000098.120957366      SIMTRANS from 80304 to -99616 Dur 312  secs
     Fluence = 4.58E+9

     2000098.122757366      OBSID 62091
 2000:098:20:14:59.823     92       EPERIGEE      ORBIT PERIGEE
     2000099.002049553      OBSID 62090
     2000099.033917366      OBSID 610
     2000099.042852398      SIMTRANS from -99616 to 74424 Dur 304  secs

As indicated above, the fluence (zero was when ACIS went into focus at
2000096:1152) at grating removal on 2000098:0212 was 4.21E+9 and at ACIS
going back to CAL posn was 4.58E+9 (2000098:1209). About 92% of the
orbital fluence was with the grating IN. I have attached a plot and an
output data file for added details. Please call or e-mail if you have
any questions.

Bill