The McIntosh Archive; Extending a long-term dataset and its applications to solar physics research

When (times in MT)
Thu, Jun 22 2023, 11am - 1 hour
Event Type
Ian Hewins
Building & Room
CG1-2139 Capt Mary

The original McIntosh Archive is a collection of solar synoptic maps covering Solar Cycles (SCs) 20 – 23 or Carrington Rotations (CRs) 1487 – 2086 (the years 1964 to 2009). Initially, Patrick McIntosh and the cartographers he trained used H α to capture filaments, sunspots and plage regions combined with Magnetograms to capture polarity inversion lines. Beginning in 1973 coronal hole boundaries derived from He 10830 Å were included on maps. The 600 original handmade maps (Gifs) and digitized versions of them (Gifs and Fits files) are accessible through the HAO website and served by NOAA. To extend the archive into the modern era in a consistent manner, a calibration of He 10830 Å to EUV data was necessary, as He 10830 Å images are not regularly available beyond 2014. This calibration allowed us to produce coronal hole maps for the Whole Heliosphere and Planetary interaction (WHPI) campaign for CRs 2109 – 2127 for a solar minimum comparison with the original archive solar minima periods. Two sets of maps were made, one with Solar Dynamics Observatory (SDO) EUV and magnetograph data and one set with Stereo-A EUV data. In addition, comparative studies of High Speed solar wind Streams (HSS) during the WHPI minimum period (minimum SC24 – 25) at Earth (Omni data), Stereo-A (Stereo-A data) and Mars (Maven data) were conducted. In a separate project with Orion Space Solutions, we are extending the original archive to include SC24 mapped with Photoshop and IDL instead of handmade maps and using EUV data instead of He 10830 Å. In this colloquium, we present the results of the He 10830 Å to EUV calibration, some of our WHPI maps and results of our comparative minima study, some of the WHPI footpoint maps and HSS studies, as well as the new paperless mapping technique being used for SC24.

About the Speaker

Ian Hewins was trained to digitize solar synoptic maps by Patrick McIntosh in 2010 and 2011 and later trained by Bob McFadden to make the original hand made solar synoptic maps in the manner taught by McIntosh.  He has been a visiting scientist at HAO since 2015.  During his time with HAO he has received NSF grants as a consultant with Boston College and is currently working as a consultant on an NSF grant to produce maps for SC24 with Orion Space Solutions.