Observations From The Hrts-9 Rocket In The Nuv Passband Of The Iris Mission

Details Observations From The Hrts-9 Rocket In The Nuv Passband Of The Iris Mission Observations From The Hrts-9 Rocket In The Nuv Passband Of The Iris Mission

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1730m&link_type=abstract

American Astronomical Society, SPD meeting #42, #17.30; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The HRTS-9 rocket flew in April 1995 and observed several solar surface features on the western solar disk. The HRTS-9 spectrograph was modified to observe a 180 A wide portion of the solar spectrum near MgII at 2800 A. Also, a slit-jaw camera observed a 400" x 900" region around the 960" long x 1" wide spectrograph slit in five passbands, specifically, 1540A (Si I), 1550A (C IV), 1560A (C I), 1600A, and images of H-alpha.
During the flight, the slit was pointed at various features including the quiet sun near disk center and the limb, active regions, and a sunspot. At the end of the flight, the pointing was fixed and a slit scanning mechanism was used to collect a series of spectra that span about 45". From this data set spectral images at specific wavelengths in the 2765 to 2885A range can be generated and compared to the broadband images at shorter wavelengths. For example, preliminary spectral images in the MgII k line show evidence of loop structures similar to those seen in C IV. Our previous efforts with this data set have focused on the impact these radiance observations near MgII have on solar spectral irradiance studies. These topics include examining the sources of solar irradiance variability, the center-to-limb variability of the quiet sun, and the relationship between the MgII intensity and the photospheric magnetic field. In light of the upcoming IRIS Explorer mission, we are turning our attention to those science goals in order to anticipate and support potential observations by the IRIS NUV spectrograph channel.
In this presentation we describe the available observations, previous results, as well as discuss our ongoing analysis and preliminary spectral images of features in the region near MgII. Work was sponsored by NASA.

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