! Hubble Space Telescope Cycle 5 (1995) Phase II Proposal Template
! $Id: 5821,v 1.1 1994/12/14 19:53:11 pepsa Exp $
!
!   Refer to the HST Phase II Proposal Instructions to fill this out
!
!   Anything after a "!" is ignored, and may be deleted
!
!   All keywords with multiple entries are comma delimited except the
!   Visit_Requirements and Special_Requirements keywords which can be
!   delimited with carriage returns or semi-colons, but not commas
!
! For help call your Program Coordinator: n/a
!             Phone: n/a             , E-mail: n/a
!
! This partially completed template was generated from a Phase I proposal.
! Name of Phase I Proposal: zheng-546.prop
! Date generated: Wed Dec 14 14:52:56 EST 1994
!

Proposal_Information                           ! Section 4
              Title:  Cosmic Evolution of Lyman Alpha Clouds
  Proposal_Category:  AR
Scientific_Category:  Quasars
             Cycle:    5

Investigators
     PI_name:         Wei Zheng
     PI_Institution:  Johns Hopkins University

          CoI_Name:   Arthur F. Davidsen
   CoI_Institution:   Johns Hopkins University
           Contact:             ! Y or N (designate at most one contact)

          CoI_Name:   Ji--Cheng Liu
   CoI_Institution:   Johns Hopkins University
           Contact:             ! Y or N (designate at most one contact)


Abstract:                                ! Free format text (please update)
    Preliminary HST results find that the number distribution of
    the Ly-alpha\ forest clouds for z < 1 is considerably
    different from that in high--z QSOs. The properties of Ly-
    alpha\ forest clouds may evolve with epoch, and the most
    significant changes take place probably at 1 < z < 2. The high
    --resolution FOS archive will provide a homogeneous database
    which is ten times larger than that used in previous work and
    enables the study to extend from z ~ 1 to z ~ 2.  By studying
    the distribution of forest clouds along the line of sight, the
    distribution with clouds' column density, and the extent of
    the proximity effect for z < 2, we hope to determine the
    fundamental distribution parameters (Gamma and Beta) and the
    intensity of the UV background radiation with accuracy
    comparable to that in optical studies.  We will be able to
    picture the evolution of intergalactic medium, and possibly
    pinpoint the most probable cause for such evolution. These
    data will be combined with the optical spectra to produce a
    complete track of properties of the intergalactic medium from
    the present epoch to z ~ 4.5.

Questions                       ! Free format text (please update)

     Observing_Description:

   Real_Time_Justification:



Calibration_Justification:              ! Move appropriate text from Real_Time_Justification

      Additional_Comments:


Fixed_Targets                           ! Section 5.1
  Target_Number:
    Target_Name:
Alternate_Names:
    Description:
       Position:                        ! Most common specification format is
                                        ! RA=0H 0M 0.00S +/- 0S,
                                        ! DEC=0D 0' 0.0" +/- 0",
                                        ! PLATE-ID=0000
        Equinox:
        RV_or_Z:
          RA_PM:                        ! Units are seconds of time per year
         Dec_PM:                        ! Units are seconds of arc per year
          Epoch:
Annual_Parallax:
           Flux:                        ! Include at least V and B-V
       Comments:


Solar_System_Targets                    ! Section 5.2
  Target_Number:
    Target_Name:
    Description:
        Level_1:                        ! Satellite of Sun
        Level_2:                        ! Satellite of Level_1
        Level_3:                        ! Satellite of Level_2
         Window:
           Flux:                        ! Include at least V and B-V
       Comments:


Generic_Targets                         ! Section 5.3
  Target_Number:
    Target_Name:
    Description:
       Criteria:
           Flux:
       Comments:


Scan_Data                               ! Appendix B
    Scan_Number:
       FGS_Scan:
  Cont_or_Dwell:
   Dwell_Points:
     Dwell_Secs:
     Scan_Width:
    Scan_Length:
    Sides_Angle:
   Number_Lines:
      Scan_Rate:
  First_Line_PA:
     Scan_Frame:
  Length_Offset:
   Width_Offset:


! This is a template for a single visit containing a single exposure
! Repeat exposure and visit blocks as needed

Visits                                  ! Section 6
      Visit_Number:
Visit_Requirements:                     ! Section 7.1

! Uncomment or copy visit level special requirements needed
! Most of these requirements (including ORIENT) will limit scheduling

        ! PCS MODE [Fine | Gyro]
        ! GUIDing TOLerance <angle>
        ! ORIENTation <angle1> TO <angle2>
        ! ORIENTation <angle1> TO <angle2> FROM <visit>
        ! ORIENTation <angle1> TO <angle2> FROM NOMINAL
        ! SAME ORIENTation AS <visit>
        ! CVZ
        ! PARallel
        ! AFTER <visit> [BY <time1> [TO <time2>]]
        ! AFTER <date>
        ! BEFORE <date>
        ! BETWEEN <date1> AND <date2>
        ! GROUP <visit-list> WITHIN <time>
        ! PERIOD <time> AND ZERO-PHASE <date>
        ! SEQ <visit-list> WITHIN <time>
        ! ON HOLD [FOR <visit>]

  On_Hold_Comments:
    Visit_Comments:

     Exposure_Number:                   ! Section 6.5
         Target_Name:
              Config:
              Opmode:
            Aperture:
          Sp_Element:
          Wavelength:
 Optional_Parameters:
Number_of_Iterations:
   Time_Per_Exposure:
Special_Requirements:                   ! Section 7.2

! Uncomment or copy exposure level special requirements needed

        ! INTeractive ACQuisition FOR <exp-list>
        ! ONBOARD ACQuisition FOR <exp-list>
        ! POSition TARGet <x-value>,<y-value>
        ! SAME POSition AS <exp>
        ! DO FOR TARGets <targ-list>    ! FGS only
        ! PARallel WITH <exp>
        ! GROUP-FGS <exp-list> WITHIN <time>
        ! SPATIAL SCAN <#> [<exp-list> | SINGLE-EXP ]
        ! RT ANALYSIS [FOR <exp-list>]
        ! REQuires UPLINK
        ! DARK TIME
        ! END ORBIT
        ! EXPAND
        ! MAXimum DURation [<time> | <%>]
        ! MINimum DURation [<time> | <%>]
        ! NO SPLIT
        ! PHASE <number1[0,1]> TO <number2[0,1]>
        ! SEQuence <exp-list> NON-INTerruptible

            Comments:

Data_Distribution                       ! Defaults indicated; change if desired

         Medium:        8MM             ! 8MM or 6250BPI or 1600BPI
Blocking_Factor:        10              ! 10 or 1
                                        ! Only astronomers with very old 9-
                                        ! track tape drives should consider
                                        ! a blocking factor of 1

        Ship_To:        PI_Address      ! STSCI or PI_Address or <free-text>
                                        ! PI Address from Phase I is:
                                        !
                                                 !  Department of Physics and Astro
                                                 !  nomy,Johns Hopkins University,
                                                 !   Baltimore, MD 21218
                                        !
                                        !
       Ship_Via:        UPS             ! UPS (2-day) or OVERNIGHT
                                        ! Overnight shipping done at PI expense

Recipient_Email:                        ! Needed if Ship_To: is not PI_Address
                                        ! <free-text>

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! Please send a list of your likes and dislikes to your Program Coordinator