Calibration underflights for SOHO and Solar Atmosphere Investigations (CALSO-5) is a multi-year program to provide the absolute solar irradiance in the extreme ultraviolet (EUV) wavelength region. The data obtained will provide verification of the Solar Heliospheric Observatory (SOHO) Solar EUV Monitor (CELIAS/SEM) calibration.
To supplement the SEM data, and the SOHO inter-calibration, the spectral emissions from key solar EUV lines and continuum will be measured on the CALSO rocket by an Optics Free Spectrometer (OFS). All instruments on the CALSO-V rocket payload make full disk observations and include the following instruments in addition to the ROCKET/SEM.
1. Rare gas ionization cell used to obtain a direct measurement of the absolute integral flux shortward of the ionization limit of the rare gas of interest (neon < 57.5 nm).
2. Double ionization cell used to obtain a direct measurement of the photoionization rate of in-flowing interstellar helium (< 50.4 nm).
3. Silicon photodiodes with aluminum and titanium filters used to continuously monitor and characterize the solar EUV flux as a function of payload altitude.
Operational Scenario
Launch is currently set for August 6, 2002, at 18:30 UT.
ICAL Instrument teams will have access to launch day activities real-time
via live web cast of the mission.
SOHO Instruments:
CELIAS/SEM will provide continuous measurements at full resolution (15s) through the complete mission. There are no mission specific requirements for the CELIAS/SEM.
EIT - EIT synoptic sets (full-resolution, full-field of view images in all four wavelengths) before, during, and after the rocket flight will be scheduled (3 synoptic sets requested, two minimum). NRT commanding will be necessary to allow for a launch slip in the rocket program.
CDS - Program operation USUN_6 will be run during the planned coordinated observations. USUN_6 will begin at T-6 hours to be centered around the planned launch of the sounding rocket. The observation will run for 13 hours. No real-time commanding is required during the sequence. There are no plans to change the CDS observation schedule in the case of minor delays of the rocket launch.
TIMED Instruments:
- TBA -
__________________________________________________________________
* Donald
R. McMullin
* USC Space
Sciences Center
* Phone(213)740-6340
* Fax: (213)740-6342
* E-Mail: mcmullin@usc.edu
___________________________________________________________________
Previous Version of ICAL012 from 1999: ICAL012 SOHO Intercalibration Joint Observing Program Updated: September 16, 1999 SOHO/CALSO-4 Cross Calibration & Co-Measurements SOHO CELIAS/SEM The SOHO CELIAS/SEM has operated continuously since its activation December, 1995. The third planned underflight calibration of the CELIAS/SEM instrument is scheduled August 18, 1999. This third calibration point will be significant in determining the time dependent stability of the SOHO SEM instrument. Calibration underflights for SOHO and Solar Atmosphere Investigations (CALSO-4)Rocket underflights for SOHO cross-calibration and solar atmosphere investigations is a multi-year program to provide the absolute solar flux in the extreme ultraviolet (EUV) wavelength region. The data obtained will provide verification of the Solar Heliospheric Observatory (SOHO) Solar EUV Monitor (CELIAS/SEM) calibration and will be distributed to the SOHO investigators on a priority basis. The SEM is calibrated using the SURF III synchrotron storage ring as a primary standard, and primarily monitors the prominent solar HeII 304 Angstrum emission line and the wavelength band between 1 and 500A. Any changes in spectral responsivity of the complement of instruments aboard will be monitored by the SEM in order not to lose their extensive pre-flight calibration. Therefore, a careful calibration, cross-calibration, and in-operation performance monitoring of the instrumentation is required. The CELIAS/SEM is included in the SOHO package to address this particular requirement. To verify the absolute intensity measurements we incorporate a flight proven rare gas ionization cell using neon as a working gas (absolute flux shortward of 575A will be obtained). Further, to supplement these data, and the SOHO inter-calibration, the spectral emissions from key solar EUV lines and continuum will be measured on the CALSO rocket by an Optics Free Spectrometer (OFS) (http://www.usc.edu/dept/space_science/ofs.htm). All instruments on the CALSO-4 rocket payload will make full disk observations. Operational Scenario The sounding rocket will be launched at local noon from the White Sands Missile Range, NM, carrying the the CELIAS/SEM calibration instruments (CALSO-4). CELIAS/SEM, and CALSO-4 data will be made available to all SOHO teams on a priority basis after verification and post flight calibrations. Launch time August 18 is currently set at 12:00 PM WSMR local time (18:00 UT). SOHO Instruments EIT - EIT images will be obtained during the mission at both He II and Fe IX & X. TRACE Coordinated observations will be made by the TRACE satellite __________________________________________________________________ * Donald R. McMullin * USC Space Sciences Center * Phone(213)740-6340 * Fax: (213)740-6342 * E-Mail: mcmullin@usc.edu ___________________________________________________________________ Previous Version of ICAL012 from 1997: ICAL012 SOHO Intercalibration Joint Observing Program SOHO/SEH-2/CALSO-3 Cross Calibration & Co-Measurements SOHO CELIAS/SEM The SOHO CELIAS/SEM has operated continuously since its activation December, 1995. The second planned underflight calibration of the CELIAS/SEM instrument is scheduled August 11, 1997. This second calibration point will be significant in determining the time dependent stability of the SOHO SEM instrument. Calibration underflights for SOHO and Solar Atmosphere Investigations (CALSO-3) Rocket underflights for SOHO cross-calibration and solar atmosphere investigations is a multi-year program to provide the absolute solar flux in the extreme ultraviolet (EUV) wavelength region. The data obtained will provide verification of the Solar Heliospheric Observatory (SOHO) Solar EUV Monitor (CELIAS/SEM) calibration and will be distributed to the SOHO investigators on a priority basis. The SEM is calibrated using the SURF II synchrotron storage ring as a primary standard, and primarily monitors the prominent solar HeII 304 emission line and the wavelength band between 170 and 700. Any changes in spectral responsivity of the complement of instruments aboard will be monitored by the SEM in order not to lose their extensive pre-flight calibration. Therefore, a careful calibration, cross-calibration, and in-operation performance monitoring of the instrumentation is required. The CELIAS/SEM is included in the SOHO package to address this particular requirement. To verify the absolute intensity measurements we incorporate a flight proven rare gas ionization cell using neon as a working gas (absolute flux shortward of 575 will be obtained). Further, to supplement these data, and the SOHO inter-calibration, the spectral emissions from key solar EUV lines and continuum will be measured on the CALSO rocket by an Optics Free Spectrometer (OFS). All instruments on the CALSO-3 rocket payload will make full disk observations. Solar EUV Hitchhiker (SEH-2) NASA's Solar System Exploration Division is supporting a study of the Jovian and other solar system and stellar objects, and their environments through remote observation of EUV/FUV emissions. To accomplish this task a comprehensive set of experiments have been collected involving international cooperation. Measurements will be performed from the shuttle bridge of the Hitchhiker-M carrier under the project name International EUV/FUV Hitchhiker (IEH). The Solar EUV Hitchhiker (SEH-2) is designed to obtain full-disk absolute solar EUV/FUV fluxes that are required to interpret the EUV/FUV emissions from solar system objects, interplanetary medium, plasmasphere, and magnetosphere that are also measured from the IEH-2 bridge. The SEH instrumentation is composed of the following instruments: EUV/FUV optical spectrometer used to obtain the solar EUV spectral flux distribution in the wavelength region between 250 - 1775 at approximately 10 resolution. Rare gas ionization cell: Used to obtain a direct measurement of the absolute integral flux shortward of the ionization limit of the rare gas of interest (neon < 575). Double ionization cell: Used to obtain a direct measurement of the photoionization rate of helium (< 504). Silicon photodiode with aluminum (Al) filter (1 - 800): Used to continuously monitor and characterize the solar variability during solar pointing in the wavelength region between 1 - 800. Operational Scenario The STS-85 flight plan is the schedule driver for the planned coordinated observations. Currently, August 11, 1997 is the planned observation in the STS-85 time line. SEH-2 is scheduled for dedicated shuttle attitude and telemetry (Ku antenna time) from orbit sunrise through sunset (approximately 45 minutes). This complete solar pass of STS-85 is planned to coincide with local noon at White Sands Missile Range, NM, where the CELIAS/SEM calibration rocket (CALSO-3) will be launched. WSMR launch operations and STS-85 payload operations will be coordinated the day of launch through GSFC voice loops. The STS-85 Attached Shuttle Payload Center (ASPC, GSFC), WSMR block house, and SOHO EOF (GSFC) will have access to launch day activities real-time via the voice loops. CELIAS/SEM, SEH-2, and CALSO-3 data will be made available to all SOHO teams on a priority basis after verification and post flight calibrations. Launch time August 11 is currently set at 12:20 PM WSMR local time. SOHO Instruments SUMER - Will carry out observations along the solar central meridian for several wavelengths with lambda > 750 A. SUMER operations will require 4 hours 28 minutes to complete the observation sequence with eight slit positions along the solar central meridian. No real-time commanding is required during the sequence. There are no plans to change the SUMER observation schedule in the case of minor delays of the rocket launch. CDS - Program operation USUN_6 will be run during the planned coordinated observations. USUN_6 will begin at T-5 hours to be centered around the planned launch of the sounding rocket. The observation will run for 11 hours. No real-time commanding is required during the sequence. There are no plans to change the CDS observation schedule in the case of minor delays of the rocket launch. EIT - EIT images will be obtained during the mission at both He II and Fe IX & X. NRT commanding will be necessary to allow for a launch slip in the rocket program. __________________________________________________________________ * Donald R. McMullin * USC Space Sciences Center * Phone(213)740-6340 * Fax: (213)740-6342 * E-Mail: mcmullin@lism.usc.edu ___________________________________________________________________