IPB

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
MER Sun Images
PDP8E
post Feb 5 2012, 01:34 AM
Post #1


Member
***

Group: Members
Posts: 522
Joined: 10-October 06
From: Maynard Mass USA
Member No.: 1241



We've seen them...almost every sol.

Attached Image

Has there been a sunspot (group) large enough to get imaged?

The Sun from MER is about 20pix across on the images
The Sun is 875K miles wide (44K miles per pixel)
The Great Sunspot of 1947 would be about 1.2pix (tall) X 2.5 pix (long) from MER

Or is the filter/resolution not right for sunspot detection?

Here is simulated image from Mars of the Great Sunspot of 1947 (your mileage may vary...)

Attached Image






--------------------
CLA CLL
Go to the top of the page
 
+Quote Post
Pertinax
post Feb 6 2012, 05:25 PM
Post #2


Member
***

Group: Members
Posts: 196
Joined: 2-March 05
From: Richmond, VA USA
Member No.: 181



I am fairly confident that since Spirit landed in early Jan 2004, there have been no spots that have been resolvable with Pancam.


I have wondered about what you asked as well, though had never had the gumption to dig into the smallest resolvable spot. Shows how really curious I was I guess. Anyway, based off total sunspot area (http://solarscience.msfc.nasa.gov/greenwch/daily_area.txt), admittedly not the best measure but the best I can find, the wonderful spots of late October 2003 would have been out best chances, if only a few months later. Since landing, no spots have come close, with the aggregate area of 21Jul04 (MerA Sol 195, MerB Sol 174) coming in at ~40% of 08Apr47's record value.

-- Pertinax
Go to the top of the page
 
+Quote Post

Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 30th August 2014 - 06:13 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is a project of the Planetary Society and is funded by donations from visitors and members. Help keep this forum up and running by contributing here.