Diana:

Here are some corrections for Chapter 4...

[Section 2]

[2.1] (first bullet)

	insert comma after the word photons

(fourth bullet)

	for consistency with usage later, change "wavelength (w)" to 
wavelength (\lambda)

[2.2] (first par)

	The speed of light should read 

		2.99793 x 10<sup>8</sup>


(a little further down, afer f=1/p)

	"just s-1  " should read "just s<sup>-1</sup>"


(Table 1)

	Frequency units should be  s<sup>-1</sup>

	Wavenumber units should be  m<sup>-1</sup>

	Speed of light value should be 2.998 x 10<sup>+8</sup>

	Speed of light units should be  m s<sup>-1</sup>

	Planck's constant value should be  6.626 x 10<sup>-34</sup>


[2.3.2]  Discussion on X-rays mentions the Sun.  You can add a reference
here to Figure 4.04.

You can use the following text for the figure caption for Fig. 4.04:

  This is an image of the Sun, as it appears in soft (relatively low energy)
X-rays.  This image was obtained by the Japanese Yokoh ("Sunbeam") spacecraft.
The bright spots correspond to locations were soft X-rays are produced, at
the bases of solar prominences, large storms on the Sun's surface.


[3]

(The para. starting with "Beyond this wavelength range,...)  The discussion
of x-rays should have a reference to Fig. 4.10, which actually shows the
Sun's emission into the X-ray region.

(Same para.)  The reference to the 10.7 cm radio emission should be accompanied
by a reference to Fig. 4.09.

[3.2] (The Para. starting with 

 	"When we look with this spectral resolution, the solar spectrum
appears to be very complicated, with many features." )

	I think you need to remove the word "link" from the following sentence

	"Each such chemical species has its own line
absorption spectrum link, and these are the lines seen in the solar spectrum."

[3.4] (1st par)

The solar constant should be 1353 (plus-or-minus 21) W m<sup>-2</sup>.  I'll
let you figure out how to get the plus-or-minus character in there.

[3.5] (1st par)

the astronomical unit should read 1.496 x 10<sup>8</sup> km

(2nd par)

The irradiance is proportional to 1/d<sup>2</sup> .


[4.2]

Change:     0.205-0.210 m 
to read:    205-210 nm

[5] (6th par; starts with "The top panel of Figure 4.11 shows the 
efficiencies of oxygen ...")

change  (O3) to read (O<sub>3</sub>)

change (O2) to read (O<sub>2</sub>)

change 104 to read 10<sup>4</sup>

Change 105 to read 10<sup>5</sup>

(par that begins "The lower curve (marked "Surface") in the figure above,...")

change to "... in Figure 4.11"

[5.1] (last par, starts with "Now, we take the same step...")

Sentence that reads  ***Figure 4.15 shows the
amplitude of Rayleigh scattering by an atom or molecule (at the center of the "doughnut").

	remove *'s
	bold-face figure reference?

[5.1.2] (end of 1st par)

should read  1/\lambda<sup>4</sup>

[6.1.1] (3rd par; starts with "The spectrum of a star, including the Sun, 
is not quite that of an ideal blackbody.")

change "including carbon, nitrogen, oxygen, silicon, potassium, sodium, iron and
nickel. "

to "including significant amounts of carbon, ...."

(same par.)

Omit the following:  "[link to section on line
spectra]"

[6.1.2]  The first equation that is noted ***need equation*** should read

     R = V/I

The second is 

     P = I<sup>2</sup> R

       = I V

(par. after the equation)

If the material were not at the same time getting rid of some of this energy at
the same time, its temperature would just keep on increasing and increasing until it melted
or vaporized.

	"at the same time" is repeated.

(next par)

When the voltage difference is established across a region of the material, an
electric field is established at all places in the material

change the first "established" to "applied"

(same par)

 If it is not too resistive, and
if the current being drawn through it, it will not warm up very much. 

Change "if the current being drawn through it" to "if only a small amount
of current is being drawn through it"


[6.1.3] (first par)

Formulas for carbon dioxide and water have the numbers in a smaller
font, but they don't appear to be subscripts.  check the HTML tags.

[6.2] (4th par)

remove the text "(in kelvin)"

[6.3] (first par)

Change "the figure above" to "Figure 4.17"

[6.5]

Remove first bullet item.