Calculating the distance of pulsars in parsecs. Please help, screenshots in clud

Question

Calculating the distance of pulsars in parsecs. Please help, screenshots in cluded.

I am going to attach an imgur, it's a very small chart and is probably easy for someone who knows how to do it. This class is online and I looked over the whole write up ( a few pages in a word doc) and couldn't find what Ta or Tb stands for, I assume time but I might be wrong. Click on this link, it's an image uploading website cannot do the problem without it, no downloads needed. https://imgur.com/a/kHF67 I would really appreciate someone's help. If you want to do just do the problem You have to look at the formulas the instructor provided and the data I have for those Three T's. Or you can clear up What t stands for and and how to calculate the distance, thanks. For people that don't understand, I need the answers of that chart which is the first two images out of the 4, the last two images just show how to do the chart and get the answers for each box including the distance of parsecs.

Explanation / Answer

We’re now ready to measure the times of arrival of the pulses. First, we record the data from several screen scans, save it in a file, and finally analyze the file in a separate graphic analysis window.

1. Turn off the receivers with the mode switch and verify that the three receivers are set to get data at 400, 600, and 800 MHz simultaneously with the horizontal seconds set at 4 and the vertical gain at 4 in each receiver. 2. Click on the record button to enable the data recorder, and then turn the receivers on with the mode switch. 3. Let the receiver scan for five or six screens worth of data (only the first 4 will be saved). Then switch off the receivers. • The computer will tell you that 1600 data points have been saved. • It will then show you the name of the object for verification. Click OK. • A pop up a screen will appear showing you information about the object you just recorded, including the time when the recording began  the frequencies, and the time between each sample of the signal.

You can not edit this data. This screen is for information only.

4. Click on OK. The computer will then ask you if you want to save the data or analyze it immediately. Click on yes, and the computer prompts us for a file name. It will make one up using the name you logged in with. If you want to change this name, you can do so. Record the name of the file you have created in the space provided: FILE NAME__________________________. Having saved the data in a file, let’s now analyze it. 5. First close the receivers by clicking on the x in the upper right corner of the main receiver window. 6. Under the File menu on the main control screen, choose Run...Data Analysis. If you have not turned off the program, a window should appear showing you the general information on the data file you just created (otherwise, it will ask you to use the Files..load menu to choose from a menu of data files by name.) 7. Click on the file containing the data you want to analyze. When you are sure you have the right file loaded for analysis, you will see a measuring window with the three traces labeled. This is similar your three receivers, but it displays the stored data you just received. • You can set down measuring lines, and scroll back and forth in the display at your leisure. • Experiment with using the horizontal pan buttons, which move the traces right and left. • Experiment with the zoom in and zoom out buttons, which magnify the scale of the traces. 8. Now let’s measure the times of arrival of a pulse at the three different frequencies you recorded. Zoom in until you can see about two pulses across the screen. This high magnification will let you measure the pulse arrival times more readily. Pan the screen so that there is a pulse at 400 MHz in the right half of the top screen.

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