CLASP2 Data Access via the VSO

Chromospheric LAyer SpectroPolarimeter (CLASP2)

April 11th 2019

CLASP2, the Chromospheric LAyer SpectroPolarimeter is the second flight of a sounding rocket designed to investigate the magnetic field of the upper chromosphere. Flight data was taken 2019-04-11 from 16:51:31 - 16:58:56. The context Slit Jaw imager remains unchanged from the first flight and observes in a bandpass with ~3.5nm FWHM centered on 121.6nm (Lyman-α). The two SpectroPolarimetric imagers observe in a wavelength range of approximately 279.2-280.7nm (slight differences between the two cameras) and capture the MgII h and k lines. The flight data released here are raw, no calibration has been applied and the SP data has not been demodulated into the Stokes parameters. Level 1 calibrated data will be available by April 2020 along with a Users Guide and other documentation. Questions about CLASP2 can be directed toward any of the following team members: Co-Principal Investigators David McKenzie (, Ryoko Ishikawa (, Javier Trujillo-Bueno (, and Frédéric Auchère (, or the Project Scientists Laurel Rachmeler ( and Joten Okamoto (
Icon  Name                      Last modified      Size  Description
[PARENTDIR] Parent Directory - [   ] CLASP2_all.tar.gz 2019-07-18 14:12 1.2G Gzipped TAR of all CLASP2 level 0 FITS files [   ] CLASP2_SP1.tar.gz 2019-08-01 12:43 454M Gzipped TAR of CLASP2 level 0 SpectroPolarimetric FITS image, camera SP1 (not demodulated) [   ] CLASP2_SP2.tar.gz 2019-08-01 12:43 461M Gzipped TAR of CLASP2 level 0 SpectroPolarimetric FITS image, camera SP2 (not demodulated) [   ] CLASP2_SJ.tar.gz 2019-08-01 12:43 280M Gzipped TAR of CLASP2 level 0 Slit-Jaw FITS images [DIR] coordinated_observations/ 2019-09-12 05:44 - Directory containing IRIS coordinated observation files [DIR] flight/ 2019-09-17 03:25 - Directory containing CLASP2 level 0 FITS files

There are 4 CLASP2 data products available: In addition there are contemporaneous data sets taken from IRIS. These include the IRIS team produced contemporaneous SDO data. There are also two other IRIS context datasets that were created
VSO Shopping cart with all CLASP2 dataVSO-NSO-190911-0362.4 GB GB
VSO Shopping cart with all CLASP2 and IRIS (SDO) dataVSO-NSO-190912-0364.9 GB
Direct link to CLASP2 Slit Jaw FITS filesCLASP2_SJ.tar.gz293 MB
Direct link to CLASP2 SP1 FITS filesCLASP2_SP1.tar.gz4.8 GB
Direct link to CLASP2 SP2 FITS filesCLASP2_SP2.tar.gz4.8 GB
Direct link to IRIS contemporaneous dataOBSID 36836034405.2 GB
Direct link to IRIS context dataOBSID 36201060774.4 GB
Direct link to IRIS context dataOBSID 36201060782.1 GB

CLASP2 data is also available via the VSO IDL client. Examples for accessing the data are given below.

IDL> files = vso_search('2019-04-11 16:51:00', '2019-04-11 16:59:00', source='CLASP2')
Records Returned : MSFC : 5/5
'files' will contain such information as
# INSTRUMENT            SOURCE  FILEID                                                                      SIZE
0 CLASP2 ALL data       CLASP2                      1.3 GB
1 CLASP2 slit jaw data  CLASP2                       293 MB
2 CLASP2 SP1 data       CLASP2                      4.8 GB
3 CLASP2 SP2 data       CLASP2                      4.8 GB
4 CLASP2 IRIS data      CLASP2 5.2 GB

to download the data use
IDL> ret = vso_get(files)
Please let us know if you have any problems or questions:

Image: The CLASP-2 mission launch on April 11 2019 from White Sands Missile Range in New Mexico.
Image Credit: US Army Photo, White Sands Missile Range
Last updated: 2019-09-11 16:10